The Effect of H2O Partial Pressure in a Calcining Atomosphere on the Critical Temperature of YBa2Cu3O7-x.

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  • Suzuki Kenji
    Department of Materials Science and Engineering, Faculty of Engineering, Himeji Institute of Technology
  • Kousaka Tadashi
    Graduate School, Himeji Institute of Technology
  • Koyama Koichiro
    Department of Materials Science and Engineering, Faculty of Engineering, Himeji Institute of Technology

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Other Title
  • ＹＢａ２Ｃｕ３Ｏ７　ｘの臨界温度に及ぼす焼成雰囲気中の水蒸気分圧の効果
  • Y Ba 2 Cu 3 O7 x ノ リンカイ オンド ニ オヨボス ショウセ

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Abstract

The effect of water vapor in a calcining atomosphere on Tc, off of YBa2Cu3O7-x was investigated using the electrical resistivity method, X-ray diffraction analysis and carbon analysis. The results are as follows:<BR>(1) The critical temperature(To, off) elevated with increasing H2O partial pressure, reached a maximum(90.5K) at a H2O partial pressure of about 5kPa, and then lowered.<BR>(2) The water vapor remarkably accelerated the decomposition of BaCO3. However, the excessive addition of water vapor was detrimental because of the formation of an unknown phase.

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