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Effects of Cation Substitution on the Thermoelectric Properties in Ca-Co-O

Published online by Cambridge University Press:  21 March 2011

Ichiro Matsubara ,
Ryoji Funahashi ,
Masahiro Shikano ,
Kei Sasaki  and
Hiroyuki Enomoto
Ichiro Matsubara
Affiliation:
National Institute of Advanced Industrial Science and Technology, Ikeda, Osaka 563-8577, JAPAN
Ryoji Funahashi
Affiliation:
National Institute of Advanced Industrial Science and Technology, Ikeda, Osaka 563-8577, JAPAN
Masahiro Shikano
Affiliation:
National Institute of Advanced Industrial Science and Technology, Ikeda, Osaka 563-8577, JAPAN
Kei Sasaki
Affiliation:
Osaka Electro-Communication University, Neyagawa, Osaka572-8530, JAPAN
Hiroyuki Enomoto
Affiliation:
Osaka Electro-Communication University, Neyagawa, Osaka572-8530, JAPAN
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Abstract

We have prepared (Ca1−x−yMxBiy)3Co4Oz (M = Mg, Sr, and Ba) thin films by a combinatorial approach using a solution process. In the systems of (Ca1−x−yMxBiy)3Co4Oz (M = Mg, Sr, and Ba), solid solution range was determined to be × < 0.8 (M = Sr, y = 0), x < 1.0 (M = Mg, y = 0), x = 0.0 (M = Ba, y = 0), and x < 0.4 (M = Bi, x = 0). No solid solution range was obtained for the substitution of Ba for Ca site. The in-plane compressive stress in the CoO2 sublattice is controllable by the cation substitution for Ca in the (Ca2CoO3) sublattice. With increasing in-plane stress, the magnitude of thermoelectric power and resistivity increased.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 691: Symposium G – Thermoelectric Materials 2001--Research and Applications , 2001 , G12.2
Copyright
Copyright © Materials Research Society 2002

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References

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