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; Shigeharu Naka; Hideaki Itoh; Hiromasa Mazaki; Jun Takada

doi:10.2497/jjspm.38.1053

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, Shigeharu Naka, Hideaki Itoh, Hiromasa Mazaki, Jun Takada

Faculty of Engineering

Research output: Contribution to journal › Article

Abstract

The effects of the additives of 0.005–0.3mol of CaC0₃(CaO), SrO, CaF₂ and SrF₂ to 2mol of the “2223” phase on the sintering behavior and the superconducting properties were investigated. The “2223” phase had a composition of Bi₁. ₈Pb₀. ₄Sr₂. _oCa₂. _oCu₃. 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 CaF₂- or SrF₂-added system, when the sintering was conducted for 120hr using specimens press-formed at 5000 kg/cm². The bulk density of the 0.3mol CaO-added specimen sintered at 850°C was 4.8g/cm³, and the critical current density, Jc at 77K, was −10³A/cm², better than that of the SrO-added specimen. The fluoride-added specimens had higher densities 5.3-5.5g/cm³, while the Jc was not increased. Tc was not influenced by the additives and remained at −110K.

Original language	English
Pages (from-to)	1053-1057
Number of pages	5
Journal	Journal of the Japan Society of Powder and Powder Metallurgy
Volume	38
Issue number	8
DOIs	https://doi.org/10.2497/jjspm.38.1053
Publication status	Published - Jan 1 1991

ASJC Scopus subject areas

Mechanical Engineering
Industrial and Manufacturing Engineering
Metals and Alloys
Materials Chemistry

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Yamamoto, R., Yada, S., Naka, S., Itoh, H., Mazaki, H., & Takada, J. (1991). 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. Journal of the Japan Society of Powder and Powder Metallurgy, 38(8), 1053-1057. https://doi.org/10.2497/jjspm.38.1053

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; Naka, Shigeharu; Itoh, Hideaki; Mazaki, Hiromasa; Takada, Jun.

In: Journal of the Japan Society of Powder and Powder Metallurgy, Vol. 38, No. 8, 01.01.1991, p. 1053-1057.

Research output: Contribution to journal › Article

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abstract = "The effects of the additives of 0.005–0.3mol of CaC03(CaO), SrO, CaF2 and SrF2 to 2mol of the “2223” phase on the sintering behavior and the superconducting properties were investigated. The “2223” phase had a composition of Bi1. 8Pb0. 4Sr2. oCa2. oCu3. 2Oy. The typical sintering temperature was 850°C for the CaO- or SrO- added system and was a little lower −840°C, for the CaF2- or SrF2-added system, when the sintering was conducted for 120hr using specimens press-formed at 5000 kg/cm2. The bulk density of the 0.3mol CaO-added specimen sintered at 850°C was 4.8g/cm3, and the critical current density, Jc at 77K, was −103A/cm2, better than that of the SrO-added specimen. The fluoride-added specimens had higher densities 5.3-5.5g/cm3, while the Jc was not increased. Tc was not influenced by the additives and remained at −110K.",

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