Influence of Y2BaCuO5 particles on the microstructure of YBa2Cu3O7−x (123)-Y2BaCuO5 (211) melt-textured superconductors
Pavel Diko, Wolfgang Gawalek, Tobias Habisreuther, Thomas Klupsch, Peter Görnert
DOI 10.1103/PhysRevB.52.13658 · Physical Review B
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Abstract
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 a-b microcrack spacing, and lc, and d211⋅V123/V211 (d211 means 211 particle size, V123 means 123 volume fraction, V211 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 a-b plane was estimated from detwinning observed around 211 particles.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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