Effect of B2O3 addition on the thermal properties and density of barium phosphate glasses

Add time:07/28/2019    Source:sciencedirect.com

Variations in glass transition temperature, onset of crystallization, thermal expansion coefficient, density and molar volume with B2O3 concentration were studied in a series of xB2O3–(100 − x)Ba(PO3)2 glasses with 0–10 mol% B2O3. DTA analysis and isothermal treatments for powdered glass samples reveal that ⩾7.5 mol% B2O3 addition suppresses surface crystallization during softening process. Raman spectroscopy suggests that the properties are related to the glass structure consisting of PO4 Q2 units with diborate and PO4–BO4 groups.

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