Preparation of YBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>x</SUB> by Vacuum Calcination and Subsequent Oxidation Method

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概要

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• Surface carbonate ion observed in YBa<SUB>2</SUB>Cu<SUB>3</SUB>Ox from a conventional ceramic method was removed during vacuum calcination up to 1200 K. No surface condensation of Y and Ba due to the formation of the Y-CO<SUB>3</SUB> and Ba-CO<SUB>3</SUB> bond was observed in YBa<SUB>2</SUB>Cu<SUB>3</SUB>Ox prepared by vacuum calcination and subsequent oxidation in a pure oxygen atmosphere. YBa<SUB>2</SUB>Cu<SUB>3</SUB>Ox prepared by this process had a lower ΔTc value and low temperature coefficient of electrical resistivity than those observed in the sample from the conventional ceramic method. The existence of carbonate ion at the surface and grain boundaries had adverse effects on the superconducting properties of the products.

• 社団法人 粉体粉末冶金協会の論文

著者

• SHIGEMATSU Toshihiko

  Department of Chemistry, Faculty of Science, Konan University

• Machida Nobuya

  Department Of Chemistry Konan University

• Nakanishi Norihiko

  Department Of Chemistry Faculty Of Science Konan University

• Shigematsu Toshihiko

  Department Of Chemistry Faculty Of Science Konan University

• Furukawa Tomohiro

  Department Of Radiology Saiseikai Fukuoka General Hospital

• Furukawa Tomohiro

  Department of Chemistry, Faculty of Science, Konan University

• Machida Nobuya

  Department of Chemistry, Faculty of Science, Konan University

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