Mechanical properties of RE-Ba-Cu-O bulk superconductors

Naomichi Sakai, S. J. Seo, Kazuo Inoue, T. Miyamoto, Masato Murakami

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

It is critically important to increase mechanical properties of RE-Ba-Cu-O bulk superconductors for practical applications. In this paper, we first studied the formation mechanism of cracking in Y-Ba-Cu-O and Sm-Ba-Cu-O massive blocks. The cracking is formed with the thermal stress during the thermal cycles, in particular, for large grain samples. The tetragonal to orthorhombic phase transformation also causes cracking mainly along the (001) cleavage planes. In addition, the cracks have the chance to propagate when strong magnetic fields are applied. Sm-Ba-Cu-O seems to be intrinsically more sensitive to cracking due to the larger lattice parameters than Y-Ba-Cu-O. However, microstructure is more important in determining the mechanical properties such as the homogeneity of RE211 inclusions or pores. Ag addition was found to be effective in improving the mechanical properties through the densification and/or the reduction in defect density.

Original languageEnglish
Pages (from-to)107-111
Number of pages5
JournalPhysica C: Superconductivity and its Applications
Volume335
Issue number1
DOIs
Publication statusPublished - 2000 Jun
Externally publishedYes

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Superconducting materials
mechanical properties
Mechanical properties
Defect density
densification
thermal stresses
Densification
Thermal stress
Lattice constants
homogeneity
phase transformations
cleavage
lattice parameters
cracks
Phase transitions
inclusions
Magnetic fields
Cracks
porosity
microstructure

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Mechanical properties of RE-Ba-Cu-O bulk superconductors. / Sakai, Naomichi; Seo, S. J.; Inoue, Kazuo; Miyamoto, T.; Murakami, Masato.

In: Physica C: Superconductivity and its Applications, Vol. 335, No. 1, 06.2000, p. 107-111.

Research output: Contribution to journalArticle

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