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

N. Chikumoto; J. Yoshioka; M. Murakami

doi:10.1016/S0921-4534(97)01705-X

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

N. Chikumoto, J. Yoshioka, M. Murakami

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

34 Citations (Scopus)

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
DOIs	https://doi.org/10.1016/S0921-4534(97)01705-X
Publication status	Published - 1997 Nov 15
Externally published	Yes

Keywords

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

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/S0921-4534(97)01705-X

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title = "Improved superconducting properties of melt-textured Nd123 by additional heat treatment",

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.",

keywords = "Critical current density, Critical temperature, Heat-treatment, Melt process, Nd-Ba-Cu-O",

author = "N. Chikumoto and J. Yoshioka and M. Murakami",

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AU - Chikumoto, N.

AU - Yoshioka, J.

AU - Murakami, M.

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.

KW - Critical current density

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