Influence of Y{sub 2}BaCuO{sub 5} particles on the microstructure of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} (123)-Y{sub 2}BaCuO{sub 5} (211) melt-textured superconductors
- Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04353 Kosice (Slovakia)
- Institut fuer Physikalische Hochtechnologie, Helmholtzweg 4, 100239 Jena, D-07702 (Germany)
The paper is devoted to the microstructural defects in melt-processed YBaCuO which can be active either as magnetic-flux-pinning centers or weak links. The influence of 211 particles in 123-211 melt-textured bulk superconductors on the microstructural features such as microcracking, subgrains, twins, and twin complexes was studied by polarized light microscopy. The observed linear dependence between {ital a}-{ital b} microcrack spacing, and {ital l}{sub {ital c}}, and {ital d}{sub 211}{center_dot}{ital V}{sub 123}/{ital V}{sub 211} ({ital d}{sub 211} means 211 particle size, {ital V}{sub 123} means 123 volume fraction, {ital V}{sub 211} means 211 volume fraction) proves that the microcracking process can be described under the framework of a model devised for the multiple failure of a unidirectional composite under uniaxial tensile loading. Shorter mean-free distance between 211 particles depresses the subgrain thickness, the twin complex size, and twin spacing. The level of residual tensile stress in the 123 {ital a}-{ital b} plane was estimated from detwinning observed around 211 particles.
- OSTI ID:
- 122342
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 18 Vol. 52; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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