Authors
Citation
Jd. Russell et C. Leach, BETA-CONDUCTIVITY CONTRAST AT BARIUM-TITANATE THERMISTOR GRAIN-BOUNDARIES, Journal of the European Ceramic Society, 16(10), 1996, pp. 1035-1039
Citations number
19
Categorie Soggetti
Material Science, Ceramics
Journal title
ISSN journal
09552219
Volume
16
Issue
10
Year of publication
1996
Pages
1035 - 1039
Database
ISI
SICI code
0955-2219(1996)16:10<1035:BCABTG>2.0.ZU;2-6
Abstract
Barium titanate based PTC thermistor materials have been examined usin
g the conductive mode of a scanning electron microscope. Under an appl
ied voltage bias, at temperatures above the Curie temperature, bright
and dark lines which are due to p-conductivity appear coincident with
grain boundaries. The mechanisms of contrast formation are discussed.
Such contrast can be used to evaluate the distribution of this type of
active grain boundary. (C) 1996 Elsevier Science Limited.