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Resistivity Control by Solid-State Reaction of Perovskite-Type Oxides

Published online by Cambridge University Press:  15 February 2011

H. Nagamoto ,
H. Tanaka  and
T. Koya
H. Nagamoto
Affiliation:
Kogakuin University, 1–24–2 Nishi–Shinjuku, Shinjuku–ku, Tokyo 163–91, Japan
H. Tanaka
Affiliation:
Kogakuin University, 1–24–2 Nishi–Shinjuku, Shinjuku–ku, Tokyo 163–91, Japan
T. Koya
Affiliation:
Fbara Corporation, 4–2–1 Hon–Fujisawa, Fujisawa 251, Japan
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Abstract

Resistivity control has been conducted by solid–state reaction of two different perovskite–type oxides. One is La0.5Ba0.5CoO3−δ (LBC) which showed metallic conduction, and its resistivity, ρ was 10−3 Ω.cm at 20 °C. The other is Ba0.998Sb0.002TiO3 (BT) which showed positive temperature coefficient of resistivity (PTCR) effect. The sintered body of the mixiure of the two oxides did not show PTCR effect. The logarithm of the resistivity of the sintered body, log ρmix was expressed using the resistivity of LBC, ρLBC, the molar ratio of BT, x, and temperature dependent constant, α(T) as

log ρmix = (l–x) log PLBC + xα(T)

which holds for 0 ≤ x ≤ 0.8 at the temperature ranging from 20 to 240° C ρmix changed by about 8 orders of magnitude at room temperature. X–ray diffraction analysis suggested that metal ions at the A–site move from one perovskite–type oxide to another and that the sintered body consisted of two perovskite–type oxides different from starting ones.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 365: Symposium M – Ceramic Matrix Composites–Advanced High-Temperature Structural Materials , 1994 , 47
Copyright
Copyright © Materials Research Society 1995

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