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Superconductive (Y1−xCax)Ba2Cu4O8 (x = 0.0 and 0.05) ceramics prepared by low and high oxygen partial pressure techniques

Published online by Cambridge University Press:  31 January 2011

Takahiro Wada ,
Nobuo Suzuki ,
Koji Yamaguchi ,
Ataru Ichinose ,
Yuji Yaegashi ,
H. Yamauchi ,
Naoki Koshizuka  and
Shoji Tanaka
Takahiro Wada
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 10–13 Shinonome 1-Chome, Koto-ku, Tokyo 135, Japan
Nobuo Suzuki
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 10–13 Shinonome 1-Chome, Koto-ku, Tokyo 135, Japan
Koji Yamaguchi
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 10–13 Shinonome 1-Chome, Koto-ku, Tokyo 135, Japan
Ataru Ichinose
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 10–13 Shinonome 1-Chome, Koto-ku, Tokyo 135, Japan
Yuji Yaegashi
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 10–13 Shinonome 1-Chome, Koto-ku, Tokyo 135, Japan
H. Yamauchi
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 10–13 Shinonome 1-Chome, Koto-ku, Tokyo 135, Japan
Naoki Koshizuka
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 10–13 Shinonome 1-Chome, Koto-ku, Tokyo 135, Japan
Shoji Tanaka
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 10–13 Shinonome 1-Chome, Koto-ku, Tokyo 135, Japan
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Abstract

Both YBa2Cu4O8 and (Y0.95Ca0.05)Ba2Cu4O8 were successfully prepared by firing for 160 h at 850 °C and at oxygen partial pressure of 3 atm without using any catalysts. These samples were characterized in terms of the crystallographic structure and thermal and superconducting properties. The x-ray powder diffraction patterns and superconducting properties for these samples were little changed after post-annealing for 6 h at 1070 °C and at oxygen partial pressure of 400 atm. However, when heat-treated at 700 °C in air and then quenched into liquid nitrogen, samples without post-annealing showed broader superconducting transitions than those post-annealed. Actually, the sharpness of the superconducting transition for a post-annealed sample was little affected by quenching. These observations were in agreement with the results of both transmission electron microscopy and thermal analyses.

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Type
Articles
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Journal of Materials Research , Volume 6 , Issue 1 , January 1991 , pp. 18 - 27
Copyright
Copyright © Materials Research Society 1991

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