Subgrain structures in RE123 bulk superconductors

研究成果: Article

抄録

We have studied the microstructures of subgrains in large-grain RE123 (RE = Y, Sm) bulk superconductors through microscopic observation and x-ray pole figure analyses. For the samples grown by slow-cooling, misorientation of the subgrains increases along with the crystal growth, and also that the misorientation has positive relation to the size and concentration of the second-phase particles. For isothermally grown samples, subgrains are likely to form under large undercooling. We discuss the possible mechanism of subgrain formation. Such subgrains are considered to affect current carrying capabilities in bulk materials, so that we performed magnetic and electric measurements for several samples having different subgrain structures. The results of Jc-B and AC transport measurements indicated that the subgrains act as weak-links, especially under high magnetic fields.

元の言語English
ページ(範囲)302-308
ページ数7
ジャーナルNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
66
発行部数4
出版物ステータスPublished - 2002 4
外部発表Yes

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Electric variables measurement
Undercooling
Magnetic variables measurement
Crystallization
Crystal growth
Superconducting materials
Poles
Magnetic fields
Cooling
X rays
misalignment
Microstructure
supercooling
magnetic measurement
crystal growth
alternating current
poles
cooling
microstructure
magnetic fields

ASJC Scopus subject areas

  • Metals and Alloys

これを引用

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title = "Subgrain structures in RE123 bulk superconductors",
abstract = "We have studied the microstructures of subgrains in large-grain RE123 (RE = Y, Sm) bulk superconductors through microscopic observation and x-ray pole figure analyses. For the samples grown by slow-cooling, misorientation of the subgrains increases along with the crystal growth, and also that the misorientation has positive relation to the size and concentration of the second-phase particles. For isothermally grown samples, subgrains are likely to form under large undercooling. We discuss the possible mechanism of subgrain formation. Such subgrains are considered to affect current carrying capabilities in bulk materials, so that we performed magnetic and electric measurements for several samples having different subgrain structures. The results of Jc-B and AC transport measurements indicated that the subgrains act as weak-links, especially under high magnetic fields.",
keywords = "Bulk superconductor, Micro-area x-ray diffraction, Polarized optical microscopy, Pole figure, RE123, Subgrain, Superconducting properties, Transmission electron microscopy, Weak-link",
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TY - JOUR

T1 - Subgrain structures in RE123 bulk superconductors

AU - Ogasawara, Kei

AU - Sakai, Naomichi

AU - Murakami, Masato

PY - 2002/4

Y1 - 2002/4

N2 - We have studied the microstructures of subgrains in large-grain RE123 (RE = Y, Sm) bulk superconductors through microscopic observation and x-ray pole figure analyses. For the samples grown by slow-cooling, misorientation of the subgrains increases along with the crystal growth, and also that the misorientation has positive relation to the size and concentration of the second-phase particles. For isothermally grown samples, subgrains are likely to form under large undercooling. We discuss the possible mechanism of subgrain formation. Such subgrains are considered to affect current carrying capabilities in bulk materials, so that we performed magnetic and electric measurements for several samples having different subgrain structures. The results of Jc-B and AC transport measurements indicated that the subgrains act as weak-links, especially under high magnetic fields.

AB - We have studied the microstructures of subgrains in large-grain RE123 (RE = Y, Sm) bulk superconductors through microscopic observation and x-ray pole figure analyses. For the samples grown by slow-cooling, misorientation of the subgrains increases along with the crystal growth, and also that the misorientation has positive relation to the size and concentration of the second-phase particles. For isothermally grown samples, subgrains are likely to form under large undercooling. We discuss the possible mechanism of subgrain formation. Such subgrains are considered to affect current carrying capabilities in bulk materials, so that we performed magnetic and electric measurements for several samples having different subgrain structures. The results of Jc-B and AC transport measurements indicated that the subgrains act as weak-links, especially under high magnetic fields.

KW - Bulk superconductor

KW - Micro-area x-ray diffraction

KW - Polarized optical microscopy

KW - Pole figure

KW - RE123

KW - Subgrain

KW - Superconducting properties

KW - Transmission electron microscopy

KW - Weak-link

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AN - SCOPUS:0036543434

VL - 66

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EP - 308

JO - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals

JF - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals

SN - 0021-4876

IS - 4

ER -