Growth of Bi-2212 single crystals by the travelling solvent zone melting method

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High quality single crystals of Bi2Sr2CaCu2Ox (Bi-2212) are needed for the development of HTS microelectronics with the intrinsic Josephson junctions and Josephson plasma excitation. In this study, Bi-2212 single crystals were grown by the travelling solvent zone melting (TSZM) technique in a gold crucible. This process involves zone melting with a solvent in a crucible to transfer a molten zone stably during growth. As a result of crystal growth, the typical size of the as-grown boules was 4 mm in diameter and about 10 mm in length. Bi-2212 single crystals of ~3 × 1 mm2 were obtained from the boules. The chemical composition of the grown crystals was determined to be Bi:Sr:Ca:Cu 1.97(4):1.75(7):0.88(3):2.0, which was close to that of the feeds. The Bi-2212 crystals annealed in oxygen at 1073 K for 72 h showed Tc,onset 91 K and a narrow superconducting transition. These results suggest that the TSZM method is effective in composition control of the Bi-2212 single crystals.

Document Type: Miscellaneous

Affiliations: Institute of Inorganic Synthesis, Yamanashi University, Miyamae 7, Kofu 400-8511, Japan

Publication date: January 1, 2002

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