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The effect of residual carbon on the superconducting properties of YBa2Cu3O7−x powders

Published online by Cambridge University Press:  31 January 2011

Yoshio Masuda ,
Rikuro Ogawa ,
Yoshio Kawate ,
Kazuo Matsubara ,
Tsuyoshi Tateishi  and
Sumio Sakka
Yoshio Masuda
Affiliation:
Superconducting and Cryogenic Technology Center, Kobe Steel Ltd., 1-5-5, Takatsukadai Nishi-ku, Kobe 651-22, Japan
Rikuro Ogawa
Affiliation:
Superconducting and Cryogenic Technology Center, Kobe Steel Ltd., 1-5-5, Takatsukadai Nishi-ku, Kobe 651-22, Japan
Yoshio Kawate
Affiliation:
Superconducting and Cryogenic Technology Center, Kobe Steel Ltd., 1-5-5, Takatsukadai Nishi-ku, Kobe 651-22, Japan
Kazuo Matsubara
Affiliation:
Kobelco Institute Co., Wakinohama Chuo-ku, Kobe 651, Japan
Tsuyoshi Tateishi
Affiliation:
Kobelco Institute Co., Wakinohama Chuo-ku, Kobe 651, Japan
Sumio Sakka
Affiliation:
Institute for Chemical Research, Kyoto University, Gokasho, Uji-shi, Kyoto 611, Japan
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Abstract

Dependence of the contents and the states of residual carbon in YBa2Cu3O7−x powders synthesized by the sol-gel method on heating conditions, and effects of residual carbon on the superconducting properties were investigated. The carbon content of the powder heated at 950 °C for 20 h was reduced to 0.02%. It has been found that a large number of carbonaceous materials in the starting materials that are used in the sol-gel method does not affect the carbon content of synthesized superconducting powders. The volume of diamagnetism was increased and the Tc,onset was raised as the carbon contents were reduced to 0.04%. These properties were further improved by O2–HIP treatment at 500 °C.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 4 , April 1993 , pp. 693 - 698
Copyright
Copyright © Materials Research Society 1993

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References

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