Single crystal growth and solidification processing of RE123 superconductive oxides |
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| Affiliation: | 1. Institute of Mechanics of Materials, Ruhr-Universität Bochum, Bochum D-44780, Germany;2. Institut für Mechanik, Montanuniversität Leoben, Leoben A-8700, Austria;3. Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Brno CZ-61662, Czech Republic;1. Department of Chemical Engineering, Konkuk University, Seoul 05029, Republic of Korea;2. Department of Physics, Vikrama Simhapuri University PG Center, Kavali 524201, India;3. Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India;4. Department of Physics, Sri Venkateswara University, Tirupati 517502, India |
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| Abstract: | Single crystal growth and bulk solidification processing in air are reviewed for the RE1+xBa2−xCu3O6+d solid solutions (RE123; RE=Sm, Nd). By changing the solvent and/or the initial composition from the usual composition of RE123—Sm2Ba1Cu1O5 (Sm211)/Nd4Ba2Cu2O10 (Nd422) to the Ba enriched side, RE123 crystals with a small amount of substitution were produced, which resulted in high Tc values of about 94–96 K for both single crystals and bulk materials. Another unique and interesting finding for the bulk processing includes the reduction of the RE211 particle size with increasing the BaO/CuO ratio in the initial composition. Uniform dispersion of the fine RE211 particles was attained in the RE123 matrix, which led to improve Jc values in relatively low magnetic fields of about 1 T. Changing the initial compositions toward the Ba enriched side is a simple and fundamental process for obtaining the bulk RE123 superconductor with high Tc and Jc values even in air, which in turn is an important and useful approach from the industrial point of view. |
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