Title :
The breakdown mechanism in barium titanate-based ferroelectric ceramics
Author :
Zhigang, Zhou ; Ruitao, Zhang ; Yugong, Wu ; Weilong, Zhang ; Zhongtai, Zhang ; Yushun, Liu
Author_Institution :
Dept. of Chem. Eng., Tsinghua Univ., Beijing, China
Abstract :
The breakdown phenomenon and mechanism of BaTiO3-CaSnO 3-CaTiSiO5 (BCC) ferroelectric ceramics, which have a special grain-core-grain-shell microstructure, are investigated. The relation of current I vs. electrical intensity E of BCC ferroelectric ceramics is found to exhibit a four-region characteristic. When an electric field weaker than 2 kV/mm is applied (region I), a conduction current of 10-8 A is obtained. The leakage current then increases linearly with increasing voltage up to 5 kV/mm in an ohmic manner (region II) within 10-6 A. Region III is a saturation region, in which the current remains constant while the electric field increased to 7 kV/mm. For voltages still higher (region IV), the current begins to rise steeply, resulting in the occurrence of breakdown through weaker zones, until a negative resistance region begins, with the simultaneous destruction of the entire specimen caused by thermal explosion
Keywords :
barium compounds; ceramics; electric breakdown of solids; ferroelectric materials; BaTiO3-CaSnO3-CaTiSiO5; I/V characteristic; breakdown mechanism; breakdown phenomenon; breakdown region; ferroelectric ceramics; four-region characteristic; grain-core-grain-shell microstructure; linear region; negative resistance region; ohmic region; saturation region; simultaneous destruction; thermal explosion; Barium; Breakdown voltage; Ceramics; Electric breakdown; Electric resistance; Ferroelectric materials; Leakage current; Microstructure; Thermal resistance; Titanium compounds;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1988. Proceedings., Second International Conference on Properties and Applications of
Conference_Location :
Beijing
DOI :
10.1109/ICPADM.1988.38354
