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Fabrication of Grain-Aligned Bulks and Thick Films of Misfit Layered Cobalt Oxides by a Magneto-Scientific Process

Published online by Cambridge University Press:  01 February 2011

Shigeru Horii ,
Taichi Okamoto ,
Toshiaki Kumagai ,
Tetsuo Uchikoshi ,
Tohru S. Suzuki ,
Yoshio Sakka ,
Jun-ichi Shimoyama  and
Kohji Kishio
Shigeru Horii
Affiliation:
[email protected], Univ. of Tokyo, Dept. Appl. Chem., Hongo 7-3-1, Bunkyo-ku,, Tokyo, Tokyo, 113-8656, Japan, +81-3-5841-7777
Taichi Okamoto
Affiliation:
[email protected]
Toshiaki Kumagai
Affiliation:
[email protected]
Tetsuo Uchikoshi
Affiliation:
[email protected]
Tohru S. Suzuki
Affiliation:
[email protected]
Yoshio Sakka
Affiliation:
[email protected]
Jun-ichi Shimoyama
Affiliation:
[email protected]
Kohji Kishio
Affiliation:
[email protected]
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Abstract

We report the preparation of grain-aligned [Ca2CoO3−δ]0.62CoO2 (Ca349) thick films and the conversion of the easy axis of magnetization from the a-axis to the c-axis. The thick films were fabricated by a simultaneous usage of electrophoretic deposition and magnetic alignment methods (MEPD) at high deposition rate with the order of 10 mm/min. Moreover, a multi-layered thick film of Al2O3/Ca349/Al2O3/Ca0.9La0.1MnO3/Al2O3 was also fabricated by the MEPD method by the optimization of condition of each suspension. The conversion of the easy axis was performed crystallochemically for a [Bi2Sr2O4]0.55CoO2 (BiSr222) compound with the easy axis parallel to the a-axis in order to fabricate c-axis grain-oriented bulks by the magnetic alignment method. The substitution of Ca for Sr in the [(Bi0.5Pb0.5)2Sr2O4] block layer induced the change of the easy axis into the c-axis direction, and the magnetic anisotropy was increased by the partial substitution of rare earth elements of Pr, Nd, Tb and Dy for Ca. Using a compound of [(Bi0.5Pb0.5)2(Ca0.8Pr0.2)2O4]0.55CoO2, we have successfully prepared the c-axis grain-aligned bulk by the magneto-scientific method. Our present results indicate that the magneto-scientific method is one of the useful and realistic processes for production of thermoelectric modules.

Keywords

ceramicthermoelectricitytexture
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 886: Symposium F – Materials and Technologies fore Direct Thermal-to-Electric Energy Conversion , 2005 , 0886-F11-03
Copyright
Copyright © Materials Research Society 2006

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References

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