Mechanical Grinding and Reforming Process of the Bi-2201 Phase

Yasunori Ikeda; Yoshihiro Daitoh; Mikio Takano; Yoshichika Bando; Toshinobu Niinae; Jun Takada

doi:10.2497/jjspm.40.183

Mechanical Grinding and Reforming Process of the Bi-2201 Phase

Yasunori Ikeda, Yoshihiro Daitoh, Mikio Takano, Yoshichika Bando, Toshinobu Niinae, Jun Takada

Faculty of Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

Mechanical grinding and the reformation from ground powder of the Bi-2201 phase were examined by XRD, TEM and DTA. The “2201” phase changed easily into amorphous powder and ultra-fine crystals by mechanical grinding. When heated above 800°C, the ground powder reacted to reform the original “2201” phase. The fine “2201” crystals smaller than a critical size remaining in the ground powder were decomposed into Bi₂CuO₄ and SrCO₃ by heating around 500°C in air, while even at room temperature in the air the XRD peaks from these ultra-fine crystals tend to disappear and SrCO₃ formed on grinding.

Original language	English
Pages (from-to)	183-186
Number of pages	4
Journal	Journal of the Japan Society of Powder and Powder Metallurgy
Volume	40
Issue number	2
DOIs	https://doi.org/10.2497/jjspm.40.183
Publication status	Published - 1993

ASJC Scopus subject areas

Mechanical Engineering
Industrial and Manufacturing Engineering
Metals and Alloys
Materials Chemistry

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abstract = "Mechanical grinding and the reformation from ground powder of the Bi-2201 phase were examined by XRD, TEM and DTA. The “2201” phase changed easily into amorphous powder and ultra-fine crystals by mechanical grinding. When heated above 800°C, the ground powder reacted to reform the original “2201” phase. The fine “2201” crystals smaller than a critical size remaining in the ground powder were decomposed into Bi2CuO4 and SrCO3 by heating around 500°C in air, while even at room temperature in the air the XRD peaks from these ultra-fine crystals tend to disappear and SrCO3 formed on grinding.",

author = "Yasunori Ikeda and Yoshihiro Daitoh and Mikio Takano and Yoshichika Bando and Toshinobu Niinae and Jun Takada",

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AU - Ikeda, Yasunori

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AU - Bando, Yoshichika

AU - Niinae, Toshinobu

AU - Takada, Jun

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AB - Mechanical grinding and the reformation from ground powder of the Bi-2201 phase were examined by XRD, TEM and DTA. The “2201” phase changed easily into amorphous powder and ultra-fine crystals by mechanical grinding. When heated above 800°C, the ground powder reacted to reform the original “2201” phase. The fine “2201” crystals smaller than a critical size remaining in the ground powder were decomposed into Bi2CuO4 and SrCO3 by heating around 500°C in air, while even at room temperature in the air the XRD peaks from these ultra-fine crystals tend to disappear and SrCO3 formed on grinding.

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