Transport and Thermoelectric Properties of the Ca1−x Sr x Ru1−y Mn y O3 System
Source: Journal of Electronic Materials, Volume 40, Number 5, May 2011 , pp. 915-919(5)
Abstract:The magnetic, transport, and thermoelectric properties of Ca1−x Sr x Ru1−y Mn y O3 have been investigated. Ferromagnetism with relatively high T C (>200 K) was introduced by Mn doping. In particular, ferromagnetism appeared in the Ca0.5Sr0.5Ru1−y Mn y O3 system at y > 0.2. The maximum T C (=270 K) was recorded for a specimen of Ca0.5Sr0.5Ru0.4Mn0.6O3. The ferromagnetism seems to be due to the mixed-valence states of Mn3+, Mn4+, Ru4+, and Ru5+ ions. The metallic character of Ru-rich specimens was suppressed by Mn substitution, and the system was transformed into a semiconductor at relatively low Mn content near y = 0.1. Specimens with higher Mn content (y > 0.8) had large thermoelectric power (50 V K−1 to 130 V K−1 at 280 K) accompanied by relatively low resistivity (0.03 Ω cm to 1 Ω cm). The Ca0.5Sr0.5Ru1−y Mn y O3 system seems to have good potential as a thermoelectric material for use above 300 K.
Document Type: Research Article
Affiliations: 1: College of Science and Engineering, Aoyama Gakuin University, Fuchinobe, Chuo, Sagamihara, Kanagawa, 229-8558, Japan, Email: email@example.com 2: College of Science and Engineering, Aoyama Gakuin University, Fuchinobe, Chuo, Sagamihara, Kanagawa, 229-8558, Japan 3: Kawazoe Frontier Technologies, Co. Ltd., Kuden, Sakae, Yokohama, Kanagawa, 931-113, Japan
Publication date: May 2011