Microstructures and superconducting properties of single domain (Sm0.5,Eu0.5)Ba2Cu3 O7-δ superconductors fabricated in air

A. Hu, Naomichi Sakai, K. Ogasawara, Masato Murakami

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Single-domain (Sm0.5,Eu0.5)Ba2Cu3 O7-δ grains were obtained via modified melt processing in air using NdBa2Cu3O7-δ seeds. The facet growth front was observed in the a/b growth direction and the stepwise growth front in the c growth direction. A series of crystal defects: dislocations, twin boundaries and local chemical variations between rare earth and Ba were revealed by transmission electron microscopy and energy dispersive spectrum analysis. In addition, a slightly higher concentration of Sm than Eu was revealed in the matrix. A high Tc value up to 94.5 K and enhanced Jc values over a wide field range at 77 K were obtained after Ar post-annealing. A pellet of diameter 16 mm trapped 0.45 T field at 77 K.

Original languageEnglish
Pages (from-to)157-163
Number of pages7
JournalPhysica C: Superconductivity and its Applications
Volume366
Issue number3
DOIs
Publication statusPublished - 2002 Jan 15
Externally publishedYes

Fingerprint

Superconducting materials
microstructure
Microstructure
air
Air
Crystal defects
Dislocations (crystals)
pellets
crystal defects
Spectrum analysis
Rare earths
spectrum analysis
Seed
seeds
flat surfaces
energy spectra
rare earth elements
Annealing
electron energy
Transmission electron microscopy

Keywords

  • (Sm,Eu)BaCu O
  • Melt processing
  • Microstructure defect
  • Superconducting properties

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

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title = "Microstructures and superconducting properties of single domain (Sm0.5,Eu0.5)Ba2Cu3 O7-δ superconductors fabricated in air",
abstract = "Single-domain (Sm0.5,Eu0.5)Ba2Cu3 O7-δ grains were obtained via modified melt processing in air using NdBa2Cu3O7-δ seeds. The facet growth front was observed in the a/b growth direction and the stepwise growth front in the c growth direction. A series of crystal defects: dislocations, twin boundaries and local chemical variations between rare earth and Ba were revealed by transmission electron microscopy and energy dispersive spectrum analysis. In addition, a slightly higher concentration of Sm than Eu was revealed in the matrix. A high Tc value up to 94.5 K and enhanced Jc values over a wide field range at 77 K were obtained after Ar post-annealing. A pellet of diameter 16 mm trapped 0.45 T field at 77 K.",
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author = "A. Hu and Naomichi Sakai and K. Ogasawara and Masato Murakami",
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T1 - Microstructures and superconducting properties of single domain (Sm0.5,Eu0.5)Ba2Cu3 O7-δ superconductors fabricated in air

AU - Hu, A.

AU - Sakai, Naomichi

AU - Ogasawara, K.

AU - Murakami, Masato

PY - 2002/1/15

Y1 - 2002/1/15

N2 - Single-domain (Sm0.5,Eu0.5)Ba2Cu3 O7-δ grains were obtained via modified melt processing in air using NdBa2Cu3O7-δ seeds. The facet growth front was observed in the a/b growth direction and the stepwise growth front in the c growth direction. A series of crystal defects: dislocations, twin boundaries and local chemical variations between rare earth and Ba were revealed by transmission electron microscopy and energy dispersive spectrum analysis. In addition, a slightly higher concentration of Sm than Eu was revealed in the matrix. A high Tc value up to 94.5 K and enhanced Jc values over a wide field range at 77 K were obtained after Ar post-annealing. A pellet of diameter 16 mm trapped 0.45 T field at 77 K.

AB - Single-domain (Sm0.5,Eu0.5)Ba2Cu3 O7-δ grains were obtained via modified melt processing in air using NdBa2Cu3O7-δ seeds. The facet growth front was observed in the a/b growth direction and the stepwise growth front in the c growth direction. A series of crystal defects: dislocations, twin boundaries and local chemical variations between rare earth and Ba were revealed by transmission electron microscopy and energy dispersive spectrum analysis. In addition, a slightly higher concentration of Sm than Eu was revealed in the matrix. A high Tc value up to 94.5 K and enhanced Jc values over a wide field range at 77 K were obtained after Ar post-annealing. A pellet of diameter 16 mm trapped 0.45 T field at 77 K.

KW - (Sm,Eu)BaCu O

KW - Melt processing

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KW - Superconducting properties

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