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Two-stage sintering of dense superconducting YBa2Cu4O8 ceramics

Published online by Cambridge University Press:  31 January 2011

Motohide Matsuda ,
Yoshihisa Ogawa ,
Kimihiro Yamashita ,
Takao Umegaki  and
Michihiro Miyake
Motohide Matsuda*
Affiliation:
Department of Industrial Chemistry, Faculty of Engineering, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-03, Japan
Yoshihisa Ogawa
Affiliation:
Department of Industrial Chemistry, Faculty of Engineering, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-03, Japan
Kimihiro Yamashita
Affiliation:
Department of Industrial Chemistry, Faculty of Engineering, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-03, Japan
Takao Umegaki
Affiliation:
Department of Industrial Chemistry, Faculty of Engineering, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-03, Japan
Michihiro Miyake
Affiliation:
Department of Environmental Chemistry and Materials, Faculty of Environmental Science and Technology, Okayama University, 2-1-1 Tsushima-Naka, Okayama 700, Japan
*
a)Author to whom correspondence should be addressed, at the Department of Environmental Chemistry and Materials, Faculty of Environmental Science and Technology, Okayama University, 2-1-1 Tsushima-Naka, Okayama 700, Japan.
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Abstract

Dense YBa2Cu4O8 (124) ceramics were prepared by the following two-stage sintering: compressed 124 powders were heated to 1203 K for decomposition to YBa2Cu3O7−x (123) and CuO, and then cooled down to 1073 K and annealed for the re-formation of 124 single phase. The relative densities thus obtained were 93–95%, as high as those prepared under high oxygen pressure. The densification was considered to take place due to the liquid phase. In the sintered 124, the island-like fine grains of CuO were observed within the 123 matrix. As a result, it was considered that the re-formation of 124 proceeded in each grain. The geometrical phase distribution in the grains is discussed on the basis of superconducting properties from resistivity measurements.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 5 , May 1997 , pp. 1205 - 1209
Copyright
Copyright © Materials Research Society 1997

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