Improved superconducting properties of melt-textured Nd123 by additional heat treatment

N. Chikumoto; J. Yoshioka; Masato Murakami

Improved superconducting properties of melt-textured Nd123 by additional heat treatment

N. Chikumoto, J. Yoshioka, Masato Murakami

Research output: Contribution to journal › Article

Abstract

We have investigated the effect of additional heat-treatment on the superconducting transition and the flux pinning properties of Nd-Ba-Cu-O melt-textured in air. After the heat-treatment at high temperatures, > 900°C, under low oxygen partial pressure, P(O₂) = 0.001 atm, the superconducting transition became sharper accompanied by an increase of J_c. However, the increase of J_c was very small and the secondary peak effect commonly observed in Nd-Ba-Cu-O melt textured in low P(O₂) could not be observed. Transmission electron microscopic observations and energy dispersive X-ray analyses show that the spatial variation of the Nd/Ba ratio is reduced after high-temperature heat-treatment, which indicates that an improvement in T_c. and J_c is attributed to a suppression of Nd substitution on the Ba site.

Original language	English
Pages (from-to)	79-84
Number of pages	6
Journal	Physica C: Superconductivity and its Applications
Volume	291
Issue number	1-2
Publication status	Published - 1997 Nov 15
Externally published	Yes

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Keywords

Critical current density
Critical temperature
Heat-treatment
Melt process
Nd-Ba-Cu-O

ASJC Scopus subject areas

Condensed Matter Physics

Cite this

Chikumoto, N., Yoshioka, J., & Murakami, M. (1997). Improved superconducting properties of melt-textured Nd123 by additional heat treatment. Physica C: Superconductivity and its Applications, 291(1-2), 79-84.

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abstract = "We have investigated the effect of additional heat-treatment on the superconducting transition and the flux pinning properties of Nd-Ba-Cu-O melt-textured in air. After the heat-treatment at high temperatures, > 900°C, under low oxygen partial pressure, P(O2) = 0.001 atm, the superconducting transition became sharper accompanied by an increase of Jc. However, the increase of Jc was very small and the secondary peak effect commonly observed in Nd-Ba-Cu-O melt textured in low P(O2) could not be observed. Transmission electron microscopic observations and energy dispersive X-ray analyses show that the spatial variation of the Nd/Ba ratio is reduced after high-temperature heat-treatment, which indicates that an improvement in Tc. and Jc is attributed to a suppression of Nd substitution on the Ba site.",

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AU - Chikumoto, N.

AU - Yoshioka, J.

AU - Murakami, Masato

PY - 1997/11/15

Y1 - 1997/11/15

N2 - We have investigated the effect of additional heat-treatment on the superconducting transition and the flux pinning properties of Nd-Ba-Cu-O melt-textured in air. After the heat-treatment at high temperatures, > 900°C, under low oxygen partial pressure, P(O2) = 0.001 atm, the superconducting transition became sharper accompanied by an increase of Jc. However, the increase of Jc was very small and the secondary peak effect commonly observed in Nd-Ba-Cu-O melt textured in low P(O2) could not be observed. Transmission electron microscopic observations and energy dispersive X-ray analyses show that the spatial variation of the Nd/Ba ratio is reduced after high-temperature heat-treatment, which indicates that an improvement in Tc. and Jc is attributed to a suppression of Nd substitution on the Ba site.

AB - We have investigated the effect of additional heat-treatment on the superconducting transition and the flux pinning properties of Nd-Ba-Cu-O melt-textured in air. After the heat-treatment at high temperatures, > 900°C, under low oxygen partial pressure, P(O2) = 0.001 atm, the superconducting transition became sharper accompanied by an increase of Jc. However, the increase of Jc was very small and the secondary peak effect commonly observed in Nd-Ba-Cu-O melt textured in low P(O2) could not be observed. Transmission electron microscopic observations and energy dispersive X-ray analyses show that the spatial variation of the Nd/Ba ratio is reduced after high-temperature heat-treatment, which indicates that an improvement in Tc. and Jc is attributed to a suppression of Nd substitution on the Ba site.

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KW - Critical temperature

KW - Heat-treatment

KW - Melt process

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Improved superconducting properties of melt-textured Nd123 by additional heat treatment

Abstract

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Keywords

ASJC Scopus subject areas

Cite this

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