Yttrium distribution in Ba-Cu-O melt during growth of superconducting material Y12 by Czochralski method

Janusz S. Szmyd; Krzysztof Gajek; Kenjiro Suzuki

Janusz S. Szmyd University of Mining and Metallurgy
Krzysztof Gajek University of Mining and Metallurgy
Kenjiro Suzuki Kyoto University

Abstract

Numerical computations of the yttrium distribution in the BaO- CuO melt were performed for the single crystal growth of yttrium barium copper oxide superconductor (YBa₂Cu₃0₇-x) with the Czochralski method. The finite volume method was used to calculate the fluid flow, heat transfer and yttrium distribution in the melt with staggered numerical grid. The flow in the melt was assumed to be axisymmetric and was modelled as an incompressible Newtonian, Boussinesque fluid. Mass transfer was due to both convection and diffusion. Calculations were presented for a buoyancy/crystal-rotation driven combined convective flow.

Keywords

References

[1] S.N. Barilo, A.P. Ges, S.A. Guretskii, D.I. Zhigunov, A.V. Zubets, A.A. Ignatenko, A.N. Igumentsev, I.D. Lomako, A.M. Luginets, V.N. Yakimovich, L.A. Kurochkin, L.V. Markova, O. I. Krot. Growth of bulk single crystals of YBa2Cu307-x from a new type of crucible. J. Crystal Growth, 119: 403- 406, 1992.
[2] K. Dembinski, M. Gervais, P. Odier, J.P. Coutures. A non polluting single crystal growth process for YBaCuO and phase diagram studies. J. Less-Common Metals, 164&165: 177- 186, 1990.
[3] A. Drake, J .S. Abell, S.D. Sutton. Flux growth and characterisation of YBa2Cu307-x single crystals. J. Less-Common Metals, 164&165: 187- 192, 1990.
[4] R. Gagnon, M. Oussena, M. Aubin. Growth of large YBa2Cu307-x crystals in the presence of a temperature gradient. J. Crystal Growth, 114: 186- 190, 1991.
[5] Y. Hikada, Y. Enomoto, M. Suzuki, M. Oda, T. Murakami. Single crystal growth of (Lal-xAx)2Cu04 (A= Ba or Sr) and Ba2 YCU3 07-y . J. Crystal Growth, 85: 581- 584, 1987.