Electret state in ferroelectric composites

Ceramic ferroelectric PZT systems possess a stable electret state. Heterogeneity is one of the principal causes leading to the formation of electret states. By using of composite materials (CM) manufactured from polycrystalline substances and glass can be one of the ways to control the degree of heterogeneity and the phase composition. The purpose of the work reported here was the preparation of some CM made from PZT type ferroelectric and glass and the investigation of their electrect properties.