フローティングゾーン法によるBi_2Sr_2Ca_<n-1>Cu_nO_yの単結晶育成(超伝導セラミックス)(<特集>導電性セラミックス)

概要

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Crystals of Bi2Sr2Can-1CunOy superconductors were grown by the floating zone technique. The effects of oxygen pressure and growth rate were investigated. Oxygen pressures were varied from PO2=0.005 to 1atm, and the growth rate from 60 to 0.8mm/h. It was found that higher oxygen pressures were important in growing single phase specimens of both the 232 (n=2) and the 221 (n=1) phases. It was also demonstrated that a lower growth rate was required to form single phase specimens of both the 232 and the 221 phases. Single crystals of the 232 phase up to 4.1×1.3×0.1mm3 and of the 221 phase up to 1.3×0.06×0.01mm3 were grown at growth rates of 0.8mm/h and 3mm/h, respectively. However, no single crystals of the 243 (n=3) phase have been obtained so far by the present method.
社団法人日本セラミックス協会の論文
1989-10-01