Ba_2Y_1Cu_3(O,F)_<7-δ>化合物の合成とその超伝導特性

概要

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Ba_2Y_1Cu_3( O, F)_<7-δ> compounds were prepare, Y_2O_3, CuO powders and one of BaF_2, YF_3 and CuF_2・2H_2O powders. It was found by thermal and X- ray analyses that YF_3 was better fluoridized material to make the Ba_2Y_1Cu_3(O,F)_<7-δ> compounds compared with BaF_2 and CuF_2. Ba_2Y_1Cu_3(O,F)_<7-δ> compounds with a small amount of fluorine were a single phase with the orthorhombic structure like the Ba_2Y_1Cu_3O_<7-δ> compound. The superconducting transition temperature, T_c and the lattice constants a_δ b_δ and c_δ were slightly changed by adding the fluorine content. The T_c depends on the lattice constant. The maximum T_c was obtained for a sample with about 0.65 and 1.3 at % fluorine and a T_c onset was about 97K. The thermal stability of the Ba_2Y_1Cu_3(O,F)_<7-δ> compounds was increased compared with the Ba_2Y_1Cu_3O_7 compound.
社団法人日本セラミックス協会の論文
1988-04-01