Thermogravimetric study on HgBa2Can-1CunO2(n+1)+δ (n = 1, 2, 3) superconductors at various oxygen partial pressures

Ayako Tokiwa-Yamamoto, Atsushi Fukuoka, Makoto Itoh, Seiji Adachi, H. Yamauchi, Keiichi Tanabe

研究成果: Article査読

28 被引用数 (Scopus)

抄録

The oxygen non-stoichiometry of HgBa2Can-1CunO2(n+1)+δ (Hg-12(n - 1)n, n = 1, 2, 3) superconductors was studied by thermogravimetric analysis (TGA) in a flowing gas atmosphere with various partial pressures of oxygen ranging from 10-5 to 10 atm. In 1 atm oxygen, irreversible reactions, probably corresponding to vaporization of Hg, were observed above about 420, 480 and 510°C for Hg-1201, 1212 and 1223 samples, respectively. Reversible reactions with oxygen absorption and desorption were confirmed below these temperatures. By controlling the oxygen partial pressure during the heating process up to 300°C and a subsequent cooling process, we obtained Hg-12(n - 1)n samples with various oxygen contents. The superconducting properties of these samples were also studied. It was found that the oxygen non-stoichiometry of Hg-12(n - 1)n superconductors is very sensitive to the oxidizing atmosphere when they are annealed, even below 300°C.

本文言語English
ページ(範囲)354-360
ページ数7
ジャーナルPhysica C: Superconductivity and its applications
269
3-4
DOI
出版ステータスPublished - 1996 10 1
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • エネルギー工学および電力技術
  • 電子工学および電気工学

フィンガープリント

「Thermogravimetric study on HgBa<sub>2</sub>Ca<sub>n-1</sub>Cu<sub>n</sub>O<sub>2(n+1)+δ</sub> (n = 1, 2, 3) superconductors at various oxygen partial pressures」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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