Anomalous dielectric behavior and reversible pyroelectricity in rollerhyphen;quenched LiNbO3and LiTaO3glass

摘要

Vitreous LiNbO3and LiTaO3have been prepared by roller quenching these compositions from the melt. The transparent glasses exhibit pronounced dielectric anomalies with peaks of egr;gsim;105close to the crystallization temperature which are not characteristic of the crystalline phase. Pyroelectricity is induced after cooling the glass in an electric field. The data are discussed in terms of a simple theoretical model for amorphous ferroelectricity and interfacial polarization due to localized ionic motion.