Title :
Electrical properties of n-type BaTiO3 ceramics with respect to its current-limiting effect
Author :
Li, H.M. ; Crichton, B.H. ; Fouracre, R.A. ; Hendry, A. ; Tedford, D.J.
Author_Institution :
Dept. of Electron. & Electr. Eng., Strathclyde Univ., Glasgow, UK
Abstract :
Electrical properties of n-type BaTiOa ceramics are reported at moderate temperatures in the range 350-470 K. The positive temperature coefficient of resistance (PTC) effect was studied under an electrical field in the range of 0.4-125 V/mm. The current-limiting effect of the material was studied by measuring the static current density (i) vs electrical field (E) under both ac and dc conditions. The response time to limit a high dc current was measured. A strong dependence of PTC effect on the applied electrical field was observed. The implication of such dependence on the observed current-limiting behaviour is discussed. The maximum electrical field which could be applied to the material was found to be limited by a thermal crack effect
Keywords :
barium compounds; ceramics; current density; electric breakdown; ferroelectric materials; space-charge-limited conduction; 350 to 470 K; BaTiO3; current-limiting effect; high dc current; n-type BaTiO3 ceramics; positive temperature coefficient of resistance; response time; static current density; thermal crack effect; Ceramics; Current density; Current measurement; Delay; Density measurement; Electric resistance; Electric variables measurement; Electrical resistance measurement; Temperature distribution; Time measurement;
Conference_Titel :
Conduction and Breakdown in Solid Dielectrics, 1995. ICSD'95., Proceedings of the 1995 IEEE 5th International Conference on
Conference_Location :
Leicester
Print_ISBN :
0-7803-2040-9
DOI :
10.1109/ICSD.1995.523027
