Thermomechanical properties and stability of mixed strontium-zinc borophosphate glasses
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Borophosphate glasses of the SrO-ZnO-B2O3-P2O5 system were prepared in 3 compositional series of 25ZnO-25SrO-xB2O3-(50 − x)P2O5, (58.3 − x) ZnO-xSrO-16.6B2O3-33.33P2O5 and (50 − x)ZnO-20B2O3-30P2O5 and the changes in their thermomechanical and thermal properties with changes in their composition were investigated. The thermal expansion coefficient α decreases with increasing B2O3 content, whereas the values of glass transformation temperature Tg and dilatation softening temperature Td increase. The replacement of ZnO by SrO increases both Tg and Td. From the DSC results the value of the the Hruby's criterion Kgl was calculated and changes in the glass-forming tendency with changes in glass composition were discussed.
KeywordsThermal Expansion Thermal Property P2O5 Expansion Coefficient B2O3
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