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Influence of Growth Rate on the Microstructure and Properties of EuBCO Bulk Superconductors Prepared by Top Seeded Melt Growth Process

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Abstract:

To prepare bulk single-crystal REBCO superconductors by the new single-direction growth method (SDMG: Single-Direction Melt-Growth), it is necessary to produce a large-area seed of high quality, for example, based on EuBCO. Since the samples prepared by the SDMG method copy the structure of the seed, for the production of large-area seeds it is necessary to optimize the time-temperature regime in order to grow seeds with a suitable structure and composition and minimize structural defects (limiting the amount of subgrains and others). A higher growth rate was used in comparison with the standard growth rates used to produce EuBCO seeds of larger dimensions. The increased growth rate in the crystal growth window reduces the outflow of the melt from the sample, and thus it is possible to achieve a single-crystal sample in the entire volume of the precursor. The samples were produced at different growth rates: 1; 2; 3 and 5 °C/h. The microstructure of the samples was studied by polarized light microscopy and scanning electron microscopy. The size and distribution of Eu211 particles in the sample volume and the subgrain structure were studied on the fabricated samples.

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Periodical:

Defect and Diffusion Forum (Volume 448)

Pages:

107-112

DOI:

https://doi.org/10.4028/p-6UBnSm

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Online since:

March 2026

Authors:

Liudmila Vojtkova*, Pavel Diko, Marek Vojtko

Keywords:

Bulk Superconductors, Cooling Rate, Eu211 Size Particles, EuBCO, Growth Rate, Microstructure, Pores, Single Crystal, Single-Direction Melt-Growth (SDMG), Subgrains, Top Seeded Melt Growth (TSMG)

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

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