金属アルコキシドを使用して作製した超伝導性Bi-Sr-Ca-Cu-O薄膜における高<i>T</i><sub>c</sub>相の生成

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  • Formation of the High-<i>T</i><sub>c</sub> Phase in Superconducting Bi-Sr-Ca-Cu-O Films Fabricated from Metal Alkoxides
  • キンゾク アルコキシド オ シヨウシテ サクセイシタ チョウデンドウセイ Bi

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The formation of the high-Tc phase in Bi-Sr-Ca-Cu-O films fabricated using metal alkoxides has been investigated. Pb-doping, addition of excess Ca and Cu, change of heating and cooling rates and firing under low oxygen partial pressure were studied to increase the volume fraction of the high-Tc phase. The Pb-doping and the firing under low oxygen partial pressure were not effective, but addition of a proper amount of excess Ca and Cu under the firing condition at high heating and cooling rates was effective. The film with a nominal composition of Bi2Sr2Ca3Cu4Ox fired at 850°C for 48h in air at heating and cooling rates of 30°C/min showed superconductivity with Tc (onset)=125K and Tc (zero)=115K.

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