Influence of P2O5/TeO2 composition ratio on the physical properties of V2O5–P2O5–TeO2 glasses for lead-free low-temperature sealing

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We examined how the composition ratio of P2O5 to TeO2 affected the physical properties and the structure of the semiconductive vanadate glasses in a low-melting V2O5–P2O5–TeO2 glass system containing 57 mol % V2O5. It was found that increasing the P2O5 content and correspondingly decreasing the TeO2 content raised the glass transition temperature and the deformation temperature as well as the fraction of the reduced V ions ([V4+]/[Vtotal]) and the average interionic distance of the V ions. In addition, the increase in P2O5 content from 7 to 32 mol % lowered the thermal expansion coefficient, volume resistivity, and density by 27, 42, and 14%, respectively, and also lowered the apparent molar volume of O ions and crystallization tendency. Furthermore, the infrared (IR) spectra suggested that the TeO2-enriched glasses had a layered structure similar to crystalline V2O5, whereas the P2O5-enriched glasses had a denser layered structure as a result of the increased packing density of the O ions due to the reduction of the V ions.
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