Abstract
Potassium-Calcium-Phosphate glasses in range were investigated. Glass transition temperature(Tg) of prepared glasses were below , thermal expansion coefficient from $270.310^{7}$ to $604.510^{7}$/. The structure of XCaO.(50-X)O glasses were examined by FT-IR spectroscopy indirectly. As CaO was increased, Ts, Tg, P-O-P bonding strength and chemical durability were increased. Glass surface change was observed with increasing dissolution time using bulk specimen, weight loss and pH change were measured as function of the dissolution time.
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