The influence of heat-treatment and oxygenation annealing on the superconducting properties of YBCO coated conductors

H. S. Kim; J. B. Song; N. Y. Kwon; K. L. Kim; H. G. Lee

doi:10.1088/0953-2048/22/12/125016

The influence of heat-treatment and oxygenation annealing on the superconducting properties of YBCO coated conductors

H. S. Kim, J. B. Song, N. Y. Kwon, K. L. Kim, H. G. Lee

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

18 Citations (Scopus)

Abstract

The superconducting properties of YBCO (yttrium barium copper oxide) coated conductors (CCs) are strongly dependent on their oxygen content. Degradation of the superconducting properties of a YBCO CC can occur due to a phase/structure transition caused by the oxygen diffusion out of the YBCO during heat-treatment or soldering, which is an inevitable process during the creation of a superconducting joint. Such variations in phase/structure are generally functions of temperature and oxygen partial pressure (P_O ₂). Therefore, in order for a superconducting joint of YBCO CC to be feasible, it is important to examine the changes in the microstructure and oxygen diffusion behavior for YBCO CCs. This study examined the superconducting properties of YBCO CCs before and after a heat-treatment under a reduced P _O2 followed by an oxygenation annealing process in an oxygen rich environment. Partial melting of YBCO without melting of the silver stabilizer layer was obtained for a sample heat treated for 60s at 820 °C and P_O2 ≃ 1x 10^-2 Torr. The superconducting properties of the sample heat treated at 820 °C were fully restored by an oxygenation annealing treatment for 15h at 600 °C.

Original language	English
Article number	125016
Journal	Superconductor Science and Technology
Volume	22
Issue number	12
DOIs	https://doi.org/10.1088/0953-2048/22/12/125016
Publication status	Published - 2009

ASJC Scopus subject areas

Ceramics and Composites
Condensed Matter Physics
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

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10.1088/0953-2048/22/12/125016

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title = "The influence of heat-treatment and oxygenation annealing on the superconducting properties of YBCO coated conductors",

abstract = "The superconducting properties of YBCO (yttrium barium copper oxide) coated conductors (CCs) are strongly dependent on their oxygen content. Degradation of the superconducting properties of a YBCO CC can occur due to a phase/structure transition caused by the oxygen diffusion out of the YBCO during heat-treatment or soldering, which is an inevitable process during the creation of a superconducting joint. Such variations in phase/structure are generally functions of temperature and oxygen partial pressure (PO 2). Therefore, in order for a superconducting joint of YBCO CC to be feasible, it is important to examine the changes in the microstructure and oxygen diffusion behavior for YBCO CCs. This study examined the superconducting properties of YBCO CCs before and after a heat-treatment under a reduced P O2 followed by an oxygenation annealing process in an oxygen rich environment. Partial melting of YBCO without melting of the silver stabilizer layer was obtained for a sample heat treated for 60s at 820 °C and PO2 ≃ 1x 10-2 Torr. The superconducting properties of the sample heat treated at 820 °C were fully restored by an oxygenation annealing treatment for 15h at 600 °C.",

author = "Kim, {H. S.} and Song, {J. B.} and Kwon, {N. Y.} and Kim, {K. L.} and Lee, {H. G.}",

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AU - Song, J. B.

AU - Kwon, N. Y.

AU - Kim, K. L.

AU - Lee, H. G.

PY - 2009

Y1 - 2009

N2 - The superconducting properties of YBCO (yttrium barium copper oxide) coated conductors (CCs) are strongly dependent on their oxygen content. Degradation of the superconducting properties of a YBCO CC can occur due to a phase/structure transition caused by the oxygen diffusion out of the YBCO during heat-treatment or soldering, which is an inevitable process during the creation of a superconducting joint. Such variations in phase/structure are generally functions of temperature and oxygen partial pressure (PO 2). Therefore, in order for a superconducting joint of YBCO CC to be feasible, it is important to examine the changes in the microstructure and oxygen diffusion behavior for YBCO CCs. This study examined the superconducting properties of YBCO CCs before and after a heat-treatment under a reduced P O2 followed by an oxygenation annealing process in an oxygen rich environment. Partial melting of YBCO without melting of the silver stabilizer layer was obtained for a sample heat treated for 60s at 820 °C and PO2 ≃ 1x 10-2 Torr. The superconducting properties of the sample heat treated at 820 °C were fully restored by an oxygenation annealing treatment for 15h at 600 °C.

AB - The superconducting properties of YBCO (yttrium barium copper oxide) coated conductors (CCs) are strongly dependent on their oxygen content. Degradation of the superconducting properties of a YBCO CC can occur due to a phase/structure transition caused by the oxygen diffusion out of the YBCO during heat-treatment or soldering, which is an inevitable process during the creation of a superconducting joint. Such variations in phase/structure are generally functions of temperature and oxygen partial pressure (PO 2). Therefore, in order for a superconducting joint of YBCO CC to be feasible, it is important to examine the changes in the microstructure and oxygen diffusion behavior for YBCO CCs. This study examined the superconducting properties of YBCO CCs before and after a heat-treatment under a reduced P O2 followed by an oxygenation annealing process in an oxygen rich environment. Partial melting of YBCO without melting of the silver stabilizer layer was obtained for a sample heat treated for 60s at 820 °C and PO2 ≃ 1x 10-2 Torr. The superconducting properties of the sample heat treated at 820 °C were fully restored by an oxygenation annealing treatment for 15h at 600 °C.

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The influence of heat-treatment and oxygenation annealing on the superconducting properties of YBCO coated conductors

Abstract

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