Physics of the Solid State
Volumes and Issues
Superconducting Tm123 granules on non-superconducting Pr123 seeds
Gokhfeld D. M. 1, Semenov S. V.1, Nemtsev I. V.1, Petrov M. I.1
1Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia
Email: gokhfeld@iph.krasn.ru, svsemenov@iph.krasn.ru, ivan_nemtsev@mail.ru, petrov@kirensky.ru

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Annealing of a two-component mixture of metal oxide powders with the same crystal structure, but different peritectic temperatures, can lead to accelerated growth of granules of the low-melting phase. This paper describes the preparation and investigation of the microstructural and magnetic characteristics of large grain ceramics in which PrBa2Cu3O7-δ (Pr123) is a refractory component, and TmBa2Cu3O7-δ (Tm123) is a component with a lower peritectic temperature. In a compound prepared from 80 vol.% Tm123 and 20 vol.% Pr123, the size of superconducting Tm123 granules reaches 0.1 mm. The presence of large granules leads to high values of remanence magnetization and trapped magnetic flux. Despite the presence of 20 % of the non-superconducting phase, the remanence magnetization in the resulting compound is only 1.07 times less than in the related large grain ceramics of 80 vol.% Tm123 and 20 vol.% Nd123, and exceeds the values of the remanence magnetization in polycrystalline superconductors obtained by standard solid-phase synthesis. Keywords: High-Tc superconductors, magnetic hysteresis, magnetization, REBCO, solid state synthesis, trapped magnetic flux.
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