On the Growth of Large Single Crystals of A2(A=Ba, Sr)Re(Re=Y, Pr)Ru1−xCuxO6 from High Temperature Solutions

S. M. Rao ； T. R. Chen ； B. H. Mok ； T. R. Chou ； Y. S. Liu ； H. L. Liu ； M. K. Wu

《Chinese Journal of Physics》 43卷3S期 (2005/06) Pp. 651-661

並列摘要

Large single crystals of the solid-solutions A2(A=Ba, Sr)Re(Re=Y, Pr)Ru1−xCuxO6 measuring 2–5 mm across and 0.25-1mm thick have been grown from high temperature solutions of PbO:PbF2. While growing smaller crystals up to 1 mm size is relatively simple, growing larger crystals presents several problems such as compositional homogeneity and morphological stability. Morphological stability was achieved by additives such as B2O3. Compositional homogeneity of the solid-solutions was maintained by proper preparation of the starting powders and sealing of crucibles to reduce evaporative loss. Size of the crystals was increased with suitable temperature programs. The microstructure, magnetic and superconducting properties of these crystals are presented. Incorporation of Cu in these crystals was confirmed by powder x-ray diffraction and Raman spectroscopic techniques and these results are also presented.