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

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

研究成果: Article

27 引用 (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.

元の言語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
発行部数3-4
出版物ステータスPublished - 1996 10 1
外部発表Yes

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Partial pressure
Superconducting materials
partial pressure
Oxygen
oxygen
atmospheres
Industrial heating
Vaporization
Thermogravimetric analysis
Desorption
Gases
desorption
Cooling
cooling
heating
gases

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

これを引用

Thermogravimetric study on HgBa2Can-1CunO2(n+1)+δ (n = 1, 2, 3) superconductors at various oxygen partial pressures. / Yamamoto, Ayako; Fukuoka, Atsushi; Itoh, Makoto; Adachi, Seiji; Yamauchi, H.; Tanabe, Keiichi.

:: Physica C: Superconductivity and its Applications, 巻 269, 番号 3-4, 01.10.1996, p. 354-360.

研究成果: Article

Yamamoto, Ayako ; Fukuoka, Atsushi ; Itoh, Makoto ; Adachi, Seiji ; Yamauchi, H. ; Tanabe, Keiichi. / Thermogravimetric study on HgBa2Can-1CunO2(n+1)+δ (n = 1, 2, 3) superconductors at various oxygen partial pressures. :: Physica C: Superconductivity and its Applications. 1996 ; 巻 269, 番号 3-4. pp. 354-360.
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abstract = "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.",
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