Effect of CaO Addition on the Properties of PbTiO₃Glass Ceramic

Abstract

Glasses of compositions (50 -X) PbO-X CaO-25 TiO 2 -25 B 2 O 3 (where X = 0,5,10 and 15 mol%) were prepared by conventional quenching technique. The glass samples were converted to glass ceramics by two stage heat treatment schedule. The XRD results confirmed the formation of ferroelectric PbTiO 3 as a major phase in the glass ceramics. For all the CaO added samples the dielectric constant as a function of temperature, exhibit a peak around 475 • C, which is close to the Curie temperature of PbTiO 3 . The hysteresis measurement supports the ferroelectric nature of the glass ceramics.