Effects of subgrains on critical current properties in melt-processed RE-Ba-Cu-O bulk superconductors

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Abstract

We have studied the microstructures of subgrains in large single-domain RE-Ba-Cu-O bulk superconductors and their effects on superconducting properties. Subgrains with high misorientation angles were seen at the positions of the later stage of melt growth, or the positions where the second-phase particles are large in size and volume. An electron backscattering diffraction technique revealed that the orientation of the second-phase particles affects the orientation of the matrix phase, some of which forms the subgrain boundaries. Electric and magnetic measurements have been performed for several samples having different subgrain geometries and the results of I-V and resistivity measurements indicated that subgrains act as weak links, especially in a high magnetic field region.

Original languageEnglish
JournalSuperconductor Science and Technology
Volume17
Issue number2
DOIs
Publication statusPublished - 2004 Feb

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Electric variables measurement
Critical currents
Magnetic variables measurement
Backscattering
Superconducting materials
critical current
Diffraction
Magnetic fields
Microstructure
Geometry
Electrons
misalignment
magnetic measurement
backscattering
microstructure
electrical resistivity
matrices
geometry
diffraction
magnetic fields

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

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title = "Effects of subgrains on critical current properties in melt-processed RE-Ba-Cu-O bulk superconductors",
abstract = "We have studied the microstructures of subgrains in large single-domain RE-Ba-Cu-O bulk superconductors and their effects on superconducting properties. Subgrains with high misorientation angles were seen at the positions of the later stage of melt growth, or the positions where the second-phase particles are large in size and volume. An electron backscattering diffraction technique revealed that the orientation of the second-phase particles affects the orientation of the matrix phase, some of which forms the subgrain boundaries. Electric and magnetic measurements have been performed for several samples having different subgrain geometries and the results of I-V and resistivity measurements indicated that subgrains act as weak links, especially in a high magnetic field region.",
author = "Kei Ogasawara and Naomichi Sakai and Koblischka, {Michael Rudolf} and Koblischka-Veneva, {Anjela Dimitrova} and Masato Murakami",
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T1 - Effects of subgrains on critical current properties in melt-processed RE-Ba-Cu-O bulk superconductors

AU - Ogasawara, Kei

AU - Sakai, Naomichi

AU - Koblischka, Michael Rudolf

AU - Koblischka-Veneva, Anjela Dimitrova

AU - Murakami, Masato

PY - 2004/2

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N2 - We have studied the microstructures of subgrains in large single-domain RE-Ba-Cu-O bulk superconductors and their effects on superconducting properties. Subgrains with high misorientation angles were seen at the positions of the later stage of melt growth, or the positions where the second-phase particles are large in size and volume. An electron backscattering diffraction technique revealed that the orientation of the second-phase particles affects the orientation of the matrix phase, some of which forms the subgrain boundaries. Electric and magnetic measurements have been performed for several samples having different subgrain geometries and the results of I-V and resistivity measurements indicated that subgrains act as weak links, especially in a high magnetic field region.

AB - We have studied the microstructures of subgrains in large single-domain RE-Ba-Cu-O bulk superconductors and their effects on superconducting properties. Subgrains with high misorientation angles were seen at the positions of the later stage of melt growth, or the positions where the second-phase particles are large in size and volume. An electron backscattering diffraction technique revealed that the orientation of the second-phase particles affects the orientation of the matrix phase, some of which forms the subgrain boundaries. Electric and magnetic measurements have been performed for several samples having different subgrain geometries and the results of I-V and resistivity measurements indicated that subgrains act as weak links, especially in a high magnetic field region.

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