Abstract
The electrophysical properties and structure of the nonstoichiometric high-temperature superconductor YBa2Cu3O y restored at T = 930–950°C after low-temperature decomposition (T = 200°C) into phases different in the oxygen content have been studied. It has been shown that, unlike heat treatments at T ≤ 900°C, the superconducting properties are almost completely restored for 3–5 h during grain recrystallization, which is impossible at lower temperatures. After short-term annealing at T = 930–950°C (for 1–2 h), the ceramic material still contains a significant number of structural defects, most likely, in cation sublattices. These defects can contribute to the pinning of magnetic vortices, which substantially increases the critical current density in magnetic fields up to 2 T as compared to ceramic materials produced by the conventional technology.
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Original Russian Text © I.B. Bobylev, N.A. Zyuzeva, E.P. Romanov, 2010, published in Fizika Tverdogo Tela, 2010, Vol. 52, No. 7, pp. 1253–1256.
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Bobylev, I.B., Zyuzeva, N.A. & Romanov, E.P. Electrophysical properties and the structure of the YBa2Cu3O y compound thermally restored after low-temperature decomposition. Phys. Solid State 52, 1338–1341 (2010). https://doi.org/10.1134/S1063783410070024
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DOI: https://doi.org/10.1134/S1063783410070024