Ba-Y-Cu-O超伝導酸化物と基板材料の反応性

概要

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The reactivity of Ba_2-YCu_3-O_7 to metal oxides and carbonates was studied to develop a substrate material for superconducting oxide films. The superconducting oxide of Ba_2-YCu_3-O_7 reacted with most of the conventional substrate materials to form oxide compounds. BaZrO_3, SrCO_3 and CaSiO_3 were less reactive to Ba_2-YCu_3O_7, and the onset critical temperature of Ba_2-YCu_3-O_7 remained unaltered after heating with these materials at 1223 K. Zero resistivity temperature (T_c(end)) , however, decreased depending on these materials. Coexistence of the substrate materials during heating increased the amount of oxygen vacancies in Ba_2-YCu_3O_7, resulting in an increased lattice constant of c axis of Ba_2-YCu_3O_7. The substrate materials for preparing high T_c superconducting oxide films require no interaction with the amount of oxygen vacancy of Ba_2-YCu_3O_7 in addition to the low chemical reactivity to Ba_2-YCu_3O_7. CaSiO_3 and BaZrO_3 were excellent substrate materials.
社団法人日本セラミックス協会の論文
1990-11-01