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GROWTH AND CHARACTERIZATION OF La2 oxSrxCuOy AND Bi2 +xSr2 .zCuOy CRYSTALS

M.S. OSOFSKY*, J.L. COHN*#, W.L. LECHTER**, E.F. SKELTON*, S. B. QADRI*, H.A. HOFF*, AND V.M. BROWNING* *Naval Research Laboratory, Washington, DC 20375-5000 #ONT Postdoctoral Research Fellow **Sachs/Freeman Associates, Inc., Landover, MD 20875

ABSTRACT In order to grow large single crystals of the La2 _xSrxCuOy and Bi2 +xSr 2 _zCuOy families of high Tc superconductors, we have studied the relationships between nominal Sr composition in the starting materials and the Sr compositions of the resulting products. We present growth, x-ray, and composition data for these samples. La-Sr-Cu-O SYSTEM Guided by the work of Hidaka et al. 1, we prepared a series of melts of the form 20 mol% (La 2 _XSrxCuOy) + 80 mol% CuO with 0.05_•x_