Electrical properties of Cr 2O 3-containing glasses

Abstract

Glass compositions of SiO 2MgOLi 2OCr 2O 3 and SiO 2CaOLi 2OCr 2O 3 systems have been prepared by melting in a platinum crucible and induction heating at 1500°C. The glass transition and crystallization temperatures were estimated by D.T.A. and electrical d.c. conductivity, dynamic measurements at a heating rate of 10°C/min. The electrical conductivity data have been used to describe the thermal evolution of glass structure. It can also be correlated with the conduction mechanism probably governed by the Cr 2O 3 content of the glass compositions. Thermally stimulated polarization techniques have been applied to elucidate the nature of the charge carrier and conduction process. The influence of the modifier ion, MO, on the crystallization and electrical properties of the glasses is discussed also.