# A novel pre-sintering technique for the growth of Y–Ba–Cu–O superconducting single grains from raw metal oxides

Li, J and Shi, Y and Dennis, A and Namburi, D and Durrell, J and Yang, W and Cardwell, D (2017) A novel pre-sintering technique for the growth of Y–Ba–Cu–O superconducting single grains from raw metal oxides. Superconductor Science and Technology, 30. ISSN 0953-2048

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## Abstract

Most established top seeded melt growth (TSMG) processes of bulk, single grain Y–Ba–Cu–O (YBCO) superconductors are performed using a mixture of pre-reacted precursor powders. Here we report the successful growth of large, single grain YBCO samples by TSMG with good superconducting properties from a simple precursor composition consisting of a sintered mixture of the raw oxides. The elimination of the requirement to synthesize precursor powders in a separate process prior to melt processing has the potential to reduce significantly the cost of bulk superconductors, which is essential for their commercial exploitation. The growth morphology, microstructure, trapped magnetic field and critical current density, $J_\text{c}$, at different positions within the sample and maximum levitation force of the YBCO single grains fabricated by this process are reported. Measurements of the superconducting properties show that the trapped filed can reach 0.45 T and that a zero field $J_\text{c}$ of 2.5 × 10$^4$ A cm$^{−2}$ can be achieved in these samples. These values are comparable to those observed in samples fabricated using pre-reacted, high purity commercial oxide precursor powders. The experimental results are discussed and the possibility of further improving the melt process using raw oxides is outlined.

Item Type: Article bulk superconductor YBCO single grains top seeded melt growth melt textured growth raw oxides sintering UNSPECIFIED Div C > Materials Engineering Cron Job 17 Jul 2017 19:54 10 Apr 2021 00:27 10.1088/1361-6668/aa7999