Crystallization Process in Fast-quenched Bi-Sr-Ca-Cu-O

Yoshio Oka; Naoichi Yamamoto; Yoichi Tomii; Hitoshi Kitaguchi; Kiichi Oda; Jun Takada

doi:10.2497/jjspm.36.493

Crystallization Process in Fast-quenched Bi-Sr-Ca-Cu-O

Yoshio Oka, Naoichi Yamamoto, Yoichi Tomii, Hitoshi Kitaguchi, Kiichi Oda, Jun Takada

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

Abstract

As a rule crystallization of amorphous Bi₂Sr₂CaCu₂O_y leads to the 24Å phase followed by the formation of the 30Å phase above 800°C. The nominal composition of the 24Å phase is Bi₂Sr₂CuO_y and hence the crystallization into the 24Å phase causes the problem of the discrepancy of composition. In order to solve the problem, crystallization process of fast-quenched Bi₂Sr₂CaCu₂Oy has been examined by using the X-ray diffraction and SEM-EDX. It has been found that the crystallization of amorphous Bi₂Sr₂CaCu₂O_y into the 24Å phase was accompanied with the phase separation into the 24Å phase and a Cu-rich region so as to adjust the compositions. In the next step of crystallization, the separated regions reacted together above 800°C into the 30Å phase.

Original language	English
Pages (from-to)	493-496
Number of pages	4
Journal	Journal of the Japan Society of Powder and Powder Metallurgy
Volume	36
Issue number	5
DOIs	https://doi.org/10.2497/jjspm.36.493
Publication status	Published - 1989
Externally published	Yes

ASJC Scopus subject areas

Mechanical Engineering
Industrial and Manufacturing Engineering
Metals and Alloys
Materials Chemistry

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title = "Crystallization Process in Fast-quenched Bi-Sr-Ca-Cu-O",

abstract = "As a rule crystallization of amorphous Bi2Sr2CaCu2Oy leads to the 24{\AA} phase followed by the formation of the 30{\AA} phase above 800°C. The nominal composition of the 24{\AA} phase is Bi2Sr2CuOy and hence the crystallization into the 24{\AA} phase causes the problem of the discrepancy of composition. In order to solve the problem, crystallization process of fast-quenched Bi2Sr2CaCu2Oy has been examined by using the X-ray diffraction and SEM-EDX. It has been found that the crystallization of amorphous Bi2Sr2CaCu2Oy into the 24{\AA} phase was accompanied with the phase separation into the 24{\AA} phase and a Cu-rich region so as to adjust the compositions. In the next step of crystallization, the separated regions reacted together above 800°C into the 30{\AA} phase.",

author = "Yoshio Oka and Naoichi Yamamoto and Yoichi Tomii and Hitoshi Kitaguchi and Kiichi Oda and Jun Takada",

year = "1989",

doi = "10.2497/jjspm.36.493",

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T1 - Crystallization Process in Fast-quenched Bi-Sr-Ca-Cu-O

AU - Oka, Yoshio

AU - Yamamoto, Naoichi

AU - Tomii, Yoichi

AU - Kitaguchi, Hitoshi

AU - Oda, Kiichi

AU - Takada, Jun

PY - 1989

Y1 - 1989

N2 - As a rule crystallization of amorphous Bi2Sr2CaCu2Oy leads to the 24Å phase followed by the formation of the 30Å phase above 800°C. The nominal composition of the 24Å phase is Bi2Sr2CuOy and hence the crystallization into the 24Å phase causes the problem of the discrepancy of composition. In order to solve the problem, crystallization process of fast-quenched Bi2Sr2CaCu2Oy has been examined by using the X-ray diffraction and SEM-EDX. It has been found that the crystallization of amorphous Bi2Sr2CaCu2Oy into the 24Å phase was accompanied with the phase separation into the 24Å phase and a Cu-rich region so as to adjust the compositions. In the next step of crystallization, the separated regions reacted together above 800°C into the 30Å phase.

AB - As a rule crystallization of amorphous Bi2Sr2CaCu2Oy leads to the 24Å phase followed by the formation of the 30Å phase above 800°C. The nominal composition of the 24Å phase is Bi2Sr2CuOy and hence the crystallization into the 24Å phase causes the problem of the discrepancy of composition. In order to solve the problem, crystallization process of fast-quenched Bi2Sr2CaCu2Oy has been examined by using the X-ray diffraction and SEM-EDX. It has been found that the crystallization of amorphous Bi2Sr2CaCu2Oy into the 24Å phase was accompanied with the phase separation into the 24Å phase and a Cu-rich region so as to adjust the compositions. In the next step of crystallization, the separated regions reacted together above 800°C into the 30Å phase.

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Crystallization Process in Fast-quenched Bi-Sr-Ca-Cu-O

Abstract

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