Effect of additive compositional alkaline earth metal oxides and fluorides on critical current density of superconductors in the Bi (Pb)-Sr-Ca-Cu-O system

Ryoichi Yamamoto, Setsuo Yada, Hideaki Itoh, Hiromasa Mazaki, Jun Takada, Shigeharu Naka

Research output: Contribution to journalArticle

Abstract

The effects of the additives of 0.005-0, 3mol of CaCO3(CaO), SrO, CaF 2 and SrF 2 to 2mol of the '2223' phase on the sintering behavior and the superconducting properties were investigated. The '2223' phase had a composition of Bi 1.8Pb 0.4Sr 2.0Ca 2.0Cu 3.2O y. The typical sintering temperature was 850°C for the CaO- or SrO- added system and was a little lower -840°C, for the CaF 2- or SrF 2- added system, when the sintering was conducted for 120hr using specimens press-formed at 5000 kg/cm 2. The bulk density of the 0.3mol CaO-added specimen sintered at 850°C was 4.8g/cm 3, and the critical current density, Jc at 77K, was approximately 10 3 A/cm 2, better than that of the SrO-added specimen. The fluoride-added specimens had higher densities 5.3-5.5g/cm 3, while the Jc was not increased. Tc was not influenced by the additives and remained at approximately 110K.

Original languageEnglish
Pages (from-to)1053-1057
Number of pages5
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume38
Issue number8
Publication statusPublished - Nov 1991
Externally publishedYes

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Alkaline Earth Metals
Critical current density (superconductivity)
Alkaline earth metals
Fluorides
Oxides
Superconducting materials
Sintering
Chemical analysis
Temperature

ASJC Scopus subject areas

  • Mechanical Engineering
  • Metals and Alloys

Cite this

Effect of additive compositional alkaline earth metal oxides and fluorides on critical current density of superconductors in the Bi (Pb)-Sr-Ca-Cu-O system. / Yamamoto, Ryoichi; Yada, Setsuo; Itoh, Hideaki; Mazaki, Hiromasa; Takada, Jun; Naka, Shigeharu.

In: Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy, Vol. 38, No. 8, 11.1991, p. 1053-1057.

Research output: Contribution to journalArticle

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