Title :
Grain-boundary resistivity in barium titanate ceramic positive temperature coefficient sensors
Author :
Wong, H. ; Han, P.G. ; Poon, M.C. ; Chen, Y.Y. ; Zheng, X.R.
Author_Institution :
Dept. of Electron. Eng., City Univ. of Hong Kong, Kowloon, Hong Kong
Abstract :
Several positive temperature coefficient resistors (PTCR´s) are prepared using commercially available BaTiO3 powders with different additives (Y, Mn, Nb, AST). We found that the different additives will result in different grain sizes, grain surface and porosity. However, the temperature-dependent resistivities of these samples do not have significant difference. A new model is proposed to explain this discrepancy and the three-segment characteristics in the PTCR
Keywords :
barium compounds; ceramics; electric sensing devices; electrical resistivity; grain boundaries; grain size; porous materials; thermistors; BaTiO3; BaTiO3 powder; PTCR; additive; barium titanate ceramic; grain boundary resistivity; grain size; grain surface; porosity; positive temperature coefficient sensor; Additives; Barium; Ceramics; Conductivity; Ferroelectric materials; Grain boundaries; Grain size; Niobium; Powders; Resistors; Temperature; Temperature distribution; Temperature sensors; Titanium compounds;
Conference_Titel :
Electron Devices Meeting, 1997. Proceedings., 1997 IEEE Hong Kong
Print_ISBN :
0-7803-3802-2
DOI :
10.1109/HKEDM.1997.642354
