Recent Developments and Future Prospects of Boro-Telluride Glass Research: A Review

INTRODUCTION

Glass is a material that is highly prized owing to the fact that it is transparent, possessing malleability, and having specific properties. It has been an important part of human civilization for a lengthy amount of time, and it continues to perform that function. The amorphous nature of glass, which is caused by the lack of a regular crystalline structure, is the cause of the particular qualities that glass has as well as the extensive variety of applications that it may be used for. Within the scope of this introductory part, we will investigate the composition of glass as well as the production method of glass. The manufacture of glass is a multi-step process that requires multiple phases. The first step is to collect the raw ingredients, which include things like silica sand, soda ash, and limestone. To generate a batch mixture, these components are first combined in a certain quantity before being blended together. It is the batch combination. The manufacturing of glass is a complex process that involves cooling and solidifying a molten material without experiencing crystallisation. This process is accomplished without crystallisation. Glass is characterised by an atomic structure that does not exhibit the long-range order that is typical of crystalline materials. Crystalline materials are characterised by the fact that their atoms or molecules organise themselves in a certain pattern. Due to the irregularity in the atomic structure of glass, the material has qualities that are not found in other materials. It is possible to ascribe the material's greater transparency to the fact that it has an inherent instability, which results in an improved capacity to assist the passage of light.Therefore, in order to accomplish the transition of molten glass the case that fast cooling takes place. This will inhibit the creation of a crystalline lattice. The lack of order in the atoms and molecules of glass ultimately results in the formation of the amorphous, non-crystalline form of glass. In order to possess a full awareness of the complexity connected with the process of glassmaking, it is vital to possess the ability to modify the qualities of glass to meet particular needs in a variety of scenarios. The manufacture of glass involves a wide variety of procedures, each of which contributes to the formation of various variants, each of which has its own unique collection of characteristics. The standard method for the manufacturing of glass includes the quick cooling of a combination of raw materials that has been fused together earlier. It is possible that this technique is also widely referred to as melt-quenching. In the creation of silicate glasses, which constitute a sizeable fraction of the glass items that are now on the market for purchase, the technique that was just described is often used. The production of glass may also be accomplished by a technique that is referred to as "sol-gel processing." During this process, a colloidal suspension (sol) that has been subjected to gel transformation is dried out. This process makes it easier to include a wide variety of chemicals and provides rigorous control over the composition, which ultimately results in glasses that have features that can be tailored to the person's specific needs. In the production of glasses with optical and electrical specialisations, sol-gel processes are especially useful because of their wide range of applications. Vapour deposition methods, including physical vapour deposition (PVD) and chemical vapour deposition (CVD), have seen substantial advancements that have considerably expanded the scope of glass manufacture via their use. The production process of advanced glass, which is used in optics, electronics, and a variety of other cutting-edge technologies, may be simplified by the utilisation of these methods, which allow for the exact application of thin films or coatings onto substrates. Glass's versatility is shown by the fact that it can be used in a broad variety of applications across a bunch of different sectors. When it comes to the building of windows, facades, and structural components, glass is an essential component. The major purpose of this component is to let natural light to enter a structure while also providing protection from a variety of environmental conditions for the building. Lenses, glasses, and imaging systems are all examples of applications that often make use of glass because of its ability to provide both transparency and accuracy. The primary reason behind this is because it has an excellent optical clarity. In addition, the area of electronics is strongly reliant on the use of glass and its properties. The particular qualities that glass contains make it an excellent material for use in a wide variety of electrical applications. Fibre optic connections, for example, substrates. The many electrical applications of glass are brought to light by these examples. Glass is an essential component in modern technology since it is used in a variety of devices, including solar panels, LEDs, and touchscreens. In the field of medicine, glass is employed for a variety of purposes, including the packaging of pharmaceuticals, the production of medical devices, and the construction of laboratory apparatus. Its non-reactive and inert properties are mostly responsible for this predilection, which is why it is preferred. Glass containers are advised for the storage and preservation of food and drinks in order to guarantee the goods' quality and safety. This is done in order to ensure that the items are safe to consume. Glass continues to be a source of inspiration for innovation in a variety of contemporary industries, which allows it to expand its impact beyond the applications that it has traditionally been used for. One example that illustrates this concept is smart glass, which is a form of glass that can dynamically modify its transparency in reaction to the cues that it receives from the surrounding environment. These characteristics have the potential to be used in a variety of applications within the field of environmentally friendly transportation and building technology. Because bioactive glasses have the capacity to form a connection with biological tissues, they are a material that shows a great deal of promise for use in medical implants and tissue engineering applications.

It was reported by Liping et al. (2008) that the incorporation of B2O3 into silicate glasses results in an increase in the thermal and chemical stability of the glasses [1]. In addition, Ferrat et al. (2012) [2] claims that B2O3 is classified as one of the most efficient oxide glass formers. Boron oxide (B2O3) is said to exhibit greater B-O bonding in comparison to silicon dioxide (Si-O), as stated by Johnson et al. (1982) [3]. This is the case despite the fact that boron oxide has a lower density of 1.80 g cm 3 and a lower viscosity. An analysis of the random network model of BO3 triangles in boron oxide was carried out by Goubeau and colleagues (1953) [4] using Raman spectroscopy as part of their research for the topic. For the purpose of forming a boroxol (B3O6) ring, it has been established that the triangles are linked to one another. According to Figure 1 (Snyder et al., 1980; Strong et al., 1968) [5,6], the bond angle between the B-O-B atoms is around 130 degrees. This information was brought to light by Snyder et al. In addition to this, Krogh-Moe (1969) [7] provided evidence of a disorganised three-dimensional network that was composed of BO3 triangles and displayed a considerable quantity of boroxol rings. A prominent peak can be seen in the Raman spectra

Galeener in 1982 [8].

X-ray diffraction (Mozzi et al., 1970) [10], neutron diffraction (Hannon et al., 1994 [11]; Johnson et al., 1982 [12]), nuclear magnetic resonance (NMR) (Jellison et al., 1978) [13], and Raman spectroscopy (Walrafen et al., 1990) [14] are some of the analytical methods that have been utilised in order to ascertain the quantities of boron rings that are present in various glasses. Boron ring content may be estimated to fall anywhere between 0.5 and 0.85 percent based on the range shown. Because their XRD studies on B2O3 glasses yielded an empirical radial distribution function that differed from the anticipated radial distribution function for the same glass, it is anticipated that a limited number of boroxol rings would exist. This is based on the findings that were discovered by Dunlevey et al. (1977) and Soppe et al. (1988) [15, 16]. A number of desirable physical qualities are possessed by borate glasses. These properties include an extraordinary ability to make glass, a low melting point, remarkable thermal stability, and great transparency. Borate glasses are primarily made up of two structural components, which are referred to as BO4 and BO1, respectively. The incorporation of B2O3 into tellurite network glasses results in an improvement in both the chemical and physical properties thereof. According to the results of Becker (1999) [17], Bürger et al. (1984) [18], and Kaur et al. (2014) [19], it has been found that borotellurite glasses undergo a transition from BO4 to BO3 and a decrease in boron-oxygen coordination (NB-O) when the concentration of B2O3 is increased. This is a result of the fact that the borotellurite glasses undergo these changes. Incorporating B2O3 into tungsten tellurite glasses increases the concentration of BO3 units relative to the concentration of BO4 units, as stated by Saddeek (2009) [20]. This addition also results in a structural transformation, which is seen in Figure 2. This transformation results in BO4 units being converted into BO3 units. As the fraction of tetrahedral borons (N4) in borotellurite glasses diminishes, the glass forming ability (GFA) of these glasses also falls. The N4 value that is present in the glass network has opposite aspect of the situation. If the value of N4 is increased, then a greater variety of glass formations may be achieved throughout the spectrum. While the existence of TeO4 units is what distinguishes the crystalline phase of TeO2 from the glassy phase, the presence of TeO3 units with triangular coordination is what distinguishes the glassy phase from the crystalline portion. According to the findings of the research carried out by Maheshvaran and colleagues (2013) [21], The enhancement of electrical conductivity in borotellurite glasses can potentially be achieved through the formation of mixed structural units, such as BTeO3 and BTeO5. The process of mixing tellurite and borate units results in the formation of these units.

In addition to fluorescence intensity and structural alterations, rare-earth tellurite glasses that have been doped with B2O3 display a number of other beneficial features. Because of these features, they are very useful applications, including amplifiers, optical fibres, and a variety of other applications. In the research carried out by Shen et al. (2007) [22], a discovery was made about the effect of B2O3 on the phonon energy of glasses doped with Er3+, TeO2, ZnO, and Na2O.. This was shown to be the case. A collection of different scholars, in their study published in 2013, Yin [23] and colleagues propose that niobium tellurite glasses, which have been doped with Er3+/Ce3+ and a reasonable quantity of B2O3, have the potential to function as a gain medium for erbium-doped fibre amplifiers that operate in the 1.53 µm band. The excited states of 4I13/2, 4I11/2, and 4I9/2 are shown in Figure 3 of the optical absorption spectra of Er3+/Ce3+ doped niobium borotellurite. Additionally, the transitions at 2H11/2 and 4S3/2 are also displayed in this figure.

MoO3 is utilised in the area of non-linear optics owing to its outstanding optoelectronic characteristics, as stated by Vasililopoulou et al. (2012) [24]. This discovery was made by the researchers. When mixed with TeO2 (Aswini, 1990) [25] and B2O3, this chemical has the capacity to operate as both a network former and a network modulator (Fabian et al., 2016; Fabian et al., 2014) [26, 27]. This ability was discovered by Fabian et al. Kozhukharov and colleagues' study from 1978 [28] proved that the combination of MoO3 and TeO2 may efficiently govern phase separation in glasses. This was shown by the findings of the research. Glasses with a composition that ranges from 12.5 to 58.5 mol% may be manufactured using this combination of ingredients. In 2003, the research that was carried out by Calas and colleagues found that... El-Moneim (2002) and Kaur et al. (2013) [29-31] performed research that shown that it had the capability to produce structural alterations in the tellurite network. These findings were disclosed by the investigations. Both the V2O5-TeO2 and WO3-TeO2 systems have been shown to exhibit alterations that are equivalent to these modifications. TeO3+1, TeO3 with four-fold coordination, MoO4, and single and paired MoO6 octahedra with six-fold coordination are the essential elements of TeO2-MoO3 glasses (Sekiya et al., 1995; Sokolov et al., 2009 [32]). These constituents are referred to as the principal components of TeO2-MoO3 glasses. In Figure 4, it can be observed that the Raman spectra display a distinct peak at approximately 920 cm-1 as a result of the incorporation of MoO3 into the TeO2 network. There is a corresponding shift of this peak towards a higher wavenumber, namely around 940 cm-1, when the concentration of MoO3 is increased. This shift occurs when the MoO3 concentration is increased. The creation of molybdate structural units may be inferred from this alteration in the structure. Research on the short-range atomic order in molybdenum examples of these techniques include X-ray photoelectron spectroscopy, neutron and X-ray diffraction, and Extended X-ray Absorption Fine Structure. A plethora of other methods are also used. The coordination numbers of Mo6+ and Te4+, which were previously 6 and 4, respectively, were shown to decrease with addition of MoO3, according to a 1988 study by Neov et al.

According to the findings of the research carried out by Neov et al. (1988) and Manisha et al. (2001) [37], it has been determined that an increase in the quantity of molybdenum oxide (MoO3) that is present in molybdenum tellurite glasses leads to the transformation of molybdenum oxide (MoO6) crystal structures into molybdenum oxide (MoO4) crystal structures. A study was conducted by Sokolov and colleagues (2009) to analyse the structure of molybdenum tellurite glasses. This research was carried out, and it was published in 2009. After doing quantum mechanical calculations and using Raman spectroscopy, the researchers arrived at the conclusion that these glasses are composed solely of TeO4, O=TeO2, single octahedral (O=MoO5), and paired octahedral (2[O=MoO5]) units. This conclusion was reached as a result of the materials' composition. Sokolov et al. argue that the glass network does not include either of these kinds of units because of the inherent instability of MoO4 tetrahedra and MoO6 units with two double bonds. This is the reason why the glass network does not contain either of these types of units. The features of single or paired MoO6 and MoO4 compounds were investigated by researchers Sekiya et al. (1995) and Dimitriev et al. (1983) using Raman and FTIR. Both of these techniques were used. The outcomes of these experiments indicate that the presence of Mo-O-Mo connections becomes increasingly obvious even when the concentration of MoO3 is relatively low, particularly when it is more than 30 mol%. This is the case even when the MoO3 concentration is very low. The Raman peaks that are located at 920 cm-1 and 870 cm-1 are heightened as a direct result of this condition. As far as the Mo=O bond and the Mo-O-Mo connections are concerned, these peaks correspond to the vibrations of those bonds, respectively. Using X-ray diffraction radial distribution function analysis, Dimitriev et al. (1981)

the scenario that was detailed before. Furthermore, their findings indicated that if there is an increase in the concentration of MoO3, there is a decrease in the amount of NTe-O. The investigation suggests that the initial closeness of the Mo-O bonds in MoO4 units correlates with the Mo-K edge Extended X-ray Absorption Fine Structure (EXAFS) in nuclear glasses that contain MoO3. This is according to the findings of Calas et al. (2003), who conducted the study. Following their investigation, the researchers arrived at this conclusion as a result of their findings. Within the context of this particular case, the glass network does not exhibit direct connection with isolated MoO4 units, as seen in Figure 5. This stands in stark contrast to the condition that occurs with glasses made of molybdenum tellurite. During the course of their investigation into X-ray photoelectron spectroscopy (XPS), Mekki and colleagues (2005) made the discovery that the binding energy of three-dimensional electrons in Te4+ trapped inside MoO3-TeO2 glasses is equivalent to that of -TeO2 crystals. In glasses and -MoO3 crystals of the same composition, the binding energies of Mo6+ 3d electrons do not vary significantly from one another in a discernible way. Since there was no evidence of Mo ions in either the 4+ or 5+ oxidation states, the authors came to the conclusion that the presence of Mo ions is completely confined to the 6+ oxidation state. This was the conclusion that they reached upon analysing the data. Taking into consideration the information that was gathered, this conclusion was obtained.

The findings of the speciation of Mo-O and Te-O in these glasses have been contradictory, which has led to a lack of clarity on whether the coordination of Mo6+ is altered in any way or if it stays consistent regardless of the concentration of MoO3. For the purpose of addressing the problems of NTe-O and NMo-O, more research is necessary to investigate the structural, optical, and thermal characteristics of glasses composed of MoO3 and TeO2.

In a similar manner, the refractive index (n) of barium tellurite glasses suffers a modest rise from 2.084 to 2.088 when MoO3 is added to the glasses. Through the change of its structural units, the inclusion of an additional glass former into molybdenum tellurite glass increases the glass-forming capacity of the material as well as its thermal stability.

Based on the findings of Bajaj et al. (2009) [39], bismuth oxide is a good alternative to lead oxide because of its capacity to easily form glasses when mixed with B2O3. According to Wilding et al. (2016) [40], the synthesis of glass using TeO2 is only possible when the concentration of Bi2O3 is exceedingly low. Bi3+ ions are responsible for the considerable polarizability that Bi2O3 glasses possess, which is the reason why these glasses possess the required electrical and optical characteristics. A high dielectric constant, a low phonon energy, and an extended transmittance in the mid-infrared range are some of the qualities that It has been determined that the degree of intensity of the Bi3+ ion field is 0.53. In 2012, Singh and colleagues put together a research [41]. The optical and physical characteristics of glasses may be improved by combining them with other glass formers, such as SiO2, B2O3, P2O5, and GeO2 (Sanz et al., 2006) [42]. Combining glasses with these other glass formers can be done. According to Stone et al. (2000) [43], the combination of Bi2O3 and B2O3 glass has the potential to achieve a refractive index as high as 2.25, which leads to enhanced third-order non-linear optical characteristics. At low concentrations, generally ranging from 2 to 4 mol%, Bi2O3 is able to easily undergo the formation of glasses with TeO2. In accordance with the findings of Wilding et al. (2016), the process of melt quenching results in the development of anti-glass phases when concentrations of 10 and 20 mol% are used. The structures of the glass and anti-glass phases were investigated in the research that was carried out by Wilding and colleagues from 2016. The X-ray diffraction (XRD) patterns of a Bi2O3-TeO2 anti-glass, which had a composition of 20 mol% Bi2O3, indicated the existence of crystalline peaks that corresponded to -TeO2 and -Bi2Te4O11, respectively. TheTgof zinc bismuth borate glasses drops from 556 degrees Celsius to 327 degrees Celsius when up to 60 mol% Bi2O3 is added(Sontakke et al., 2011) [43],. Based on this finding, it can be deduced that a rise in the concentration of Bi2O3 results in a reduction in the system's capacity to produce glass. The addition of Bi2O3 to zinc bismuth borate glasses causes a rise in the glasses' refractive index, which goes from 1.67 to 2.44 as a consequence of making the glasses more transparent. Additionally, the presence of this component results in the production of a dielectric constant that is rather high. Future Perspectives It is anticipated that the arrival of a new age will bring about significant contributions from the field of glass science and technology in the form of pioneering discoveries across a variety of fields. As a result of the materials science community's unrelenting quest of knowledge and innovation, it is said that the development of glass will have a significant influence on a variety of important industries. Research efforts aiming at developing sophisticated functional eyewear have been prompted by the desire for wearable glasses that may be customised to perform certain functions. The glasses include a number of characteristics that are designed to meet the requirements of developing technology. These characteristics include increased conductivity, strength, and flexibility. The inclusion of intelligent materials into glass matrices offers the potential to facilitate the creation of adaptive glasses that are capable of displaying properties that are subject to have other potential applications. Researchers working in the fields of nanotechnology and glass are making a concerted effort to make discoveries that will revolutionise their respective fields. Research is now being conducted to determine whether or not it is possible to develop nanocomposite glasses by integrating nanoscale components into glass matrices. The creation of lightweight glasses that have better mechanical and thermal characteristics, in addition to high strength, is one of the possible outcomes that might result from this study. Not only that, but the incorporation of nanosensors into glass has the potential to open up a wide range of applications for feedback and real-time monitoring systems. The adoption of ecologically friendly techniques is common throughout a variety of sectors, including the glass industry. Sustainable glass technologies are one example of this. It is anticipated that the next developments will largely concentrate on the development of ways for recycling glass, the adoption of production methods that are favourable to the environment, and the incorporation of renewable energy sources into the process of making glass. One of the most important aspects of tackling global challenges involving the reduction of waste and the preservation of resources is the development of solutions to reduce the effect that glass materials have on the environment throughout their entire life cycle. As shown by the fact that it is relevant in both pharmaceutical and biomedical applications, it is anticipated that glass science will have a substantial influence on the biomedical sector. As a result of their capacity to interact with biological tissues in an efficient manner, bioactive glasses provide a number of major benefits to the field of regenerative medicine and drug delivery systems. In the event that more research is conducted in this area, it is hoped that more biocompatible eyeglasses will be developed. This eyewear will have the capability to integrate with the human body in a seamless manner, which will result in a revolution in the field of therapeutic treatments and medical implants. As a result of the fact that the developing area of quantum technology has the potential to significantly contribute to the development of glass applications, we have arrived at our fifth specific focus of emphasis: quantum glass technology. Among the technologies that have the potential to revolutionise data processing and sensing are quantum sensors and quantum data storage systems. Quantum glass technologies have these characteristics. Through the work that has been conducted in this area, the quantum qualities that are present in glass have been discovered. This innovation has the potential to make it easier to develop more sophisticated

Glass, which is an essential component in sensor networks and communication systems, has been the subject of intensive study as a result of the expansion of the Internet of Things (IoT), which has prompted significant research in this sector. The use of transparent conductive glasses is anticipated to bring about considerable benefits for the development of smart interfaces and surfaces. The transformation of glass panels and windows into interactive surfaces that can be seamlessly integrated with Internet of Things (IoT) devices is one possible option that might be used to provide a fresh look for user interfaces.

CONCLUSION

Research on boro-telluride glass reveals a rich tapestry of invention and possibilities. The review included synthesis, structural characterisation, and applications to provide a complete picture of this exciting subject. Researchers have improved boro-telluride glass production by using novel methods to modify their composition. This precise synthesis control refines these glasses and opens new functionality and applications. Through improved spectroscopy and microscopy, structural characterizations have illuminated boro-telluride glasses' atomic arrangements. These insights enable informed design strategies and deeper study of boro-telluride glasses' distinctive characteristics.Boro-telluride glasses' many uses in optoelectronics, photonics, energy-related technologies, and more demonstrate its flexibility and potential effect across scientific and industrial fields. As these glasses become more important in cutting-edge technology, revolutionary advances are possible. Boron-telluride glass research has bright future possibilities. Researchers, industry stakeholders, and policymakers will develop this area via collaboration. Scientific investigation and innovation are spurred by recognised and unforeseen challenges in boro-telluride glass technology. In conclusion, the study summarises recent advancements and points to boro-telluride glass research's latent potential. The synthesis of information from this review lays the groundwork for the next chapter in this dynamic story, allowing

REFERENCES

1. Liping, H., Jason, N., John, K., Jay, B. (2008). Polyamorphic transitions in vitreous B2O3 under pressure. Journal of Physics: Condensed Matter, 20: 075107. 2. Ferlat, G., Seitsonen, A. P., Lazzeri, M., Mauri, F. (2012). Hidden polymorphs drive vitrification in B2O3. Nat Mater, 11: 925-929. 3. Johnson, P. A. V., Wright, A. C., Sinclair, R. N. (1982). A neutron diffraction investigation of the structure of vitreous boron trioxide. Journal of NonCrystalline Solids, 50: 281-311. 4. Goubeau, J. and Keller, H. (1953). RAMANSpektren und Struktur von BoroxolVerbindungen. Zeitschriftfüranorganische und allgemeineChemie, 272: 303-312. 5. Snyder, L. C. and Wasserman, Z. (1980). On the structure and stability of bipyramidal B2O3. The Journal of Chemical Physics, 73: 998-999. 6. Strong, S. and Kaplow, R. (1968). The structure of crystalline B2O3. ActaCrystallographica Section B: Structural Crystallography and Crystal Chemistry, 24: 1032-1036. 7. Krogh-Moe, J. (1969). The structure of vitreous and liquid boron oxide. Journal of NonCrystalline Solids, 1: 269-284. 8. Galeener, F. (1982). Planar rings in glasses. Solid State Communications, 44: 10371040. 9. Prytula, A., Pohrelyuk, I., Fedirko, V. (2006). Interaction between amorphous boron and titanium alloys in a gaseous oxygen-containing medium. Materials Science, 42: 601-606. 10. Mozzi, R. L. and Warren, B. E. (1970). The structure of vitreous boron oxide. Journal of Applied Crystallography, 3(4): 251-257. 11. Hannon, A. C., Grimley, D. I., Hulme, R. A., Wright, A. C., Sinclair, R. N. (1994). Boroxol groups in vitreous boron oxide: new evidence from neutron diffraction and inelastic neutron scattering studies. Journal of Non-Crystalline Solids, 177: 299-316. 12. Jellison, G. E. and Bray, P. J. (1978). A Structural interpretation of B10 and B11 NMR spectra in sodium borate glasses. Journal of Non-Crystalline Solids, 29: 187206. 13. Walrafen, G., Chu, Y., Hokmabadi, M. (1990). Raman spectroscopic investigation of irreversibly compacted vitreous silica. The Journal of Chemical Physics, 92: 6987-7002. 14. Dunlevey, F. M. and Cooper, A. R. (1977). The Structure of Non-Crystalline Materials. Taylor and Francis, London. B2O3 glass. Journal of Non-Crystalline Solids, 103: 201-209. 16. Bürger, H., Vogel, W., Kozhukharov, V., Marinov, M. (1984). Phase equilibrium, glassforming, properties and structure of glasses in the TeO2-B2O3 system. Journal of Materials Science, 19: 403-412. 17. Becker, P. (1999). Borate materials in nonlinear optics. Advanced Materials, 10: 979992. 18. Kaur, N. and Khanna, A. (2014). Structural characterization of borotellurite and alumino-borotellurite glasses. Journal of Non-Crystalline Solids, 404: 116-123. 19. Saddeek, Y. (2009). Effect of B2O3 on the structure and properties of tungsten tellurite glasses. Philosophical Magazine, 89: 41-54. 20. Maheshvaran, K., Veeran, P. K., Marimuthu, K. (2013). Structural and optical studies on Eu3+ doped boro-tellurite glasses. Solid State Sciences, 17: 54-62. 21. Shen, X., Nie, Q., Xu, T., Dai, S., Wang, X. (2007). Effect of B2O3 on luminescence of erbium doped tellurite glasses. SpectrochimicaActa Part A: Molecular and Biomolecular Spectroscopy, 66: 389-393. 22. Yin, D.-d., Zheng, S.-c., Qi, Y.-w., Peng, S.-x., Zhou, Y.-x. (2013). Effect of B2O3 on the spectroscopic properties in Er3+/Ce3+ co-doped tellurite-niobium glass. Optoelectronics Letters, 9: 367-370. 23. Vasilopoulou, M., Douvas, A. M., Georgiadou, D. G., Palilis, L. C., Kennou, S., Sygellou, L., Soultati, A., Kostis, I., Papadimitropoulos, G., Davazoglou, D., Argitis, P. (2012). The Influence of Hydrogenation and Oxygen Vacancies on Molybdenum Oxides Work Function and Gap States for Application in Organic Optoelectronics. Journal of the American Chemical Society, 134: 16178-16187. 24. Fabian, M., Svab, E., &Krezhov, K. (2014). Neutron diffraction and RMC modeling of new amorphous molybdate system. Journal of Physics: Conference Series, 558: 012017. 25. Fabian, M., Svab, E., Krezhov, K. (2016). Network structure with mixed bond-angle linkages in MoO3 ZnO B2O3 glasses: Neutron diffraction and reverse Monte Carlo modelling. Journal of Non-Crystalline Solids, 433: 6-13. 26. Aswini, G. (1990). Electrical transport properties of molybdenum tellurite glassy semiconductors. Philosophical Magazine Part B, 61: 87-96. 27. Kozhukharov, V., Marinov, M., Grigorova, G. (1978). Glass-formation range in binary tellurite systems containing transition metal oxides. Journal of Non-Crystalline Solids, 28: 429-430. study. Journal of Nuclear Materials, 322: 15-20. 29. El-Moneim, A. A. (2002). DTA and IR absorption spectra of vanadium tellurite glasses. Materials Chemistry and Physics, 73: 318-322. 30. Kaur, A., Khanna, A., Sathe, V., González, F., Ortiz, B. (2013). Optical, thermal, and structural properties of Nb2O5 TeO2 and WO3TeO2 glasses. Phase Transitions, 86: 598-619. 31. Sokolov, V. O., Plotnichenko, V. G., Koltashev, V. V., Grishin, I. A. (2009). On the structure of molybdate tellurite glasses. Journal of Non-Crystalline Solids, 355: 239-251. 32. Dimitriev, Y., Dimitrov, V., Bart, J. C. J., Arnaudov, M. (1981). Structure of Glasses of the TeO2 MoO3 System. Zeitschriftfüranorganische and allgemeineChemie, 479: 229-240. 33. Neov, S., Gerasimova, I., Sidzhimov, B., Kozhukharov, V., Mikula, P. (1988). Investigation of short-range atomic order in glasses from the MoO3-TeO2 system. Journal of Materials Science, 23: 347-352. 34. Mekki, A., Khattak, G. D., Wenger, L. E. (2005). Structural and magnetic properties of MoO3 TeO2 glasses. Journal of Non-Crystalline Solids, 351: 2493-2500. 35. Jose, R., Arai, Y., Ohishi, Y. (2008). Optical properties of MoO3 containing tellurite glasses. Applied Physics Letters, 93: 161901. 36. Manisha, P., Hirota, K., Tsujigami, Y., Sakata, H. (2001). Structural and electrical properties of MoO3 -TeO2 glasses. Journal of Physics D: Applied Physics, 34: 459. 37. Dimitriev, Y., Dimitrov, V., Bart, J. C. J., Arnaudov, M. (1981). Structure of Glasses of the TeO2 MoO3 System. Zeitschriftfüranorganische and allgemeineChemie, 479: 229-240. 38. Bajaj, A., Khanna, A., Chen, B., Longstaffe, J. G., Zwanziger, U. W., Zwanziger, J. W., Gómez, Y., González, F. (2009). Structural investigation of bismuth borate glasses and crystalline phases. Journal of Non-Crystalline Solids, 355: 45-53. 39. Wilding, M. C., Delaizir, G., Benmore, C. J., Gueguen, Y., Dolhen, M., Duclère, J.-R., Chenu, S., Sukenaga, S., McMillan, P. F. (2016). Structural studies of Bi2O3Nb2O5-TeO2 glasses. Journal of Non-Crystalline Solids. 40. Singh, S. P. and Karmakar, B. (2012). Bismuth oxide and bismuth oxide doped glasses for optical and photonic applications. New York: Nova, Hauppauge 41. Sanz, O., Haro-Poniatowski, E., Gonzalo, J., Fernández Navarro, J. M. (2006).

Non-Crystalline Solids, 352: 761-768. 42. Stone, C. E., Wright, A. C., Sinclair, R. N., Feller, S. A., Affatigato, M., Hogan, D. L., Nelson, N. D., Vira, C., Dimitriev, Y. B., Gattef, E. M., Ehrt, D. (2000). Structure of bismuth borate glasses. Physics and Chemistry of Glasses, 41: 409412. 43. Sontakke, A. D., Biswas, K., Tarafder, A., Sen, R., Annapurna, K. (2011). Broadband Er3+ emission in highly nonlinear Bismuth modified Zinc-Borate glasses. Optical Materials Express, 1: 344-356.

Research Scholar, Department of Physics, Madhyanchal Professional University, Ratibad, Bhopal, Madhya Pradesh-462044, India