CTR character of metal-silica glass composites

Citation
K. Kato et al., CTR character of metal-silica glass composites, J CERAM S J, 109(2), 2001, pp. 122-126
Citations number
8
Language
GIAPPONESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
ISSN journal
0914-5400 → ACNP
Volume
109
Issue
2
Year of publication
2001
Pages
122 - 126
Database
ISI
SICI code
0914-5400(200102)109:2<122:CCOMGC>2.0.ZU;2-#
Abstract
A new class of critical temperature resistor (CTR) was fabricated from meta l/silica glass composites. The electrical resistivity of the composite with 20 vol% of Ag filler suddenly decreased from 10(5) to 10(1) Omega . m at a bout 300 degreesC, in analogy with the CTR characteristic observed in VO2 c eramics. It was assumed that this phenomenon was due to the high thermal ex pansion of the conducting filler in a low-thermal-expansion matrix: as the temperature increased, the conducting filler particles expanded to come int o contact with one to another, resulting in a drop of resistivity at a crit ical temperature. The critical temperature varied with both the kind and th e amount of metal filler.