Fabrication of large melt-textured Gd-Ba-Cu-O superconductor with Ag addition

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Abstract

Large c-axis oriented Gd-Ba-Cu-O bulk superconductors with Ag addition were melt-textured under controlled oxygen partial pressure of 1.0%. Nd123 was used as a seed crystal for the growth of large grain bulk. Single grain Gd-Ba-Cu-O samples of diameters 32 mm and 48 mm were successfully fabricated with no macro-sized cracks. Using fine Gd211 powder as a starting material remarkably reduced the size of 211 particles dispersed in the bulk. As a result, high critical current density (Jc) of 60000 - 70000 A/cm2 in a self-field was achieved at 77K. The trapped magnetic fields of the samples 32 mm and 48 mm in diameter reached 1.5T and 1.8T at 77K, respectively. These values are comparable to that of a melt-textured Sm-Ba-Cu-O bulk in similar size, and exceeds those of an Y-Ba-Cu-O bulk and the previous Gd-Ba-Cu-O bulk.

Original languageEnglish
JournalPhysica C: Superconductivity and its Applications
Volume341-348
DOIs
Publication statusPublished - 2000 Nov
Externally publishedYes

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Superconducting materials
trapped magnetic fields
Fabrication
fabrication
Crystallization
Partial pressure
Powders
partial pressure
Macros
seeds
critical current
cracks
Magnetic fields
current density
Oxygen
Cracks
Crystals
oxygen
crystals

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

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title = "Fabrication of large melt-textured Gd-Ba-Cu-O superconductor with Ag addition",
abstract = "Large c-axis oriented Gd-Ba-Cu-O bulk superconductors with Ag addition were melt-textured under controlled oxygen partial pressure of 1.0{\%}. Nd123 was used as a seed crystal for the growth of large grain bulk. Single grain Gd-Ba-Cu-O samples of diameters 32 mm and 48 mm were successfully fabricated with no macro-sized cracks. Using fine Gd211 powder as a starting material remarkably reduced the size of 211 particles dispersed in the bulk. As a result, high critical current density (Jc) of 60000 - 70000 A/cm2 in a self-field was achieved at 77K. The trapped magnetic fields of the samples 32 mm and 48 mm in diameter reached 1.5T and 1.8T at 77K, respectively. These values are comparable to that of a melt-textured Sm-Ba-Cu-O bulk in similar size, and exceeds those of an Y-Ba-Cu-O bulk and the previous Gd-Ba-Cu-O bulk.",
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AU - Nariki, S.

AU - Sakai, Naomichi

AU - Murakami, Masato

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N2 - Large c-axis oriented Gd-Ba-Cu-O bulk superconductors with Ag addition were melt-textured under controlled oxygen partial pressure of 1.0%. Nd123 was used as a seed crystal for the growth of large grain bulk. Single grain Gd-Ba-Cu-O samples of diameters 32 mm and 48 mm were successfully fabricated with no macro-sized cracks. Using fine Gd211 powder as a starting material remarkably reduced the size of 211 particles dispersed in the bulk. As a result, high critical current density (Jc) of 60000 - 70000 A/cm2 in a self-field was achieved at 77K. The trapped magnetic fields of the samples 32 mm and 48 mm in diameter reached 1.5T and 1.8T at 77K, respectively. These values are comparable to that of a melt-textured Sm-Ba-Cu-O bulk in similar size, and exceeds those of an Y-Ba-Cu-O bulk and the previous Gd-Ba-Cu-O bulk.

AB - Large c-axis oriented Gd-Ba-Cu-O bulk superconductors with Ag addition were melt-textured under controlled oxygen partial pressure of 1.0%. Nd123 was used as a seed crystal for the growth of large grain bulk. Single grain Gd-Ba-Cu-O samples of diameters 32 mm and 48 mm were successfully fabricated with no macro-sized cracks. Using fine Gd211 powder as a starting material remarkably reduced the size of 211 particles dispersed in the bulk. As a result, high critical current density (Jc) of 60000 - 70000 A/cm2 in a self-field was achieved at 77K. The trapped magnetic fields of the samples 32 mm and 48 mm in diameter reached 1.5T and 1.8T at 77K, respectively. These values are comparable to that of a melt-textured Sm-Ba-Cu-O bulk in similar size, and exceeds those of an Y-Ba-Cu-O bulk and the previous Gd-Ba-Cu-O bulk.

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