Ultrasonic characterisation of calcium phosphate glasses and glass-ceramics with addition of TiO2

Calcium phosphate based glasses with different concentrations of TiO2 (0 to 2.5 mol%) were prepared and their corresponding glass-ceramics were obtained by controlled heat treatments. The amorphous nature of glasses and the presence of crystalline phases in glass-ceramics were studied through XRD studies. Density, molar volume, ultrasonic velocities, attenuation, elastic constants and microhardness of glass and glass-ceramics were used to study structural and mechanical properties. The results indicate that the added TiO2 increases the cross link density of phosphate glasses and thus results in higher network stability. The glass-ceramics exhibits higher mechanical strength when compared with its corresponding glasses.