Order-disorder transitions and metastable phases produced by mechanical deformations in the YBa2Cu3O7−x superconducting system
F. Lavallée, M. Simoneau, G. L’Espérance, R. Schulz
DOI 10.1103/PhysRevB.44.12003 · Physical Review B
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Abstract
High-energy mechanical deformations have been used to induce order-disorder transitions in the YBa2Cu3O7−x orthorhombic structure and to synthesize metastable phases. During the milling process, a disorder is produced on the oxygen sublattice and on the Y- and Ba-cationic sites. A metastable simple cubic (Y0.33Ba0.67)CuO3−y structure is formed. This cubic phase can also be synthesized by mechanical alloying a mixture of the elemental oxides. Discussions on the mechanism of formation, the thermal stability of the metastable structure, and the superconducting properties are presented.
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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