Ln-Ba-Cu-O 系セラミックスの超伝導特性に関する研究

概要

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In order to clear the preparation and superconducting properties of Ln-Ba-Cu-O ceramics, the effects of firing condition and chemical composition on the sintered density, electromagnetic properties and crystal structure of Ln-Ba-Cu-O system were investigated by X-ray diffraction, electric resistance and magnetic susceptibility measurements. In this study, Ln indicates one rare earth element selected from the group of Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu. The highest density is obtained at an optimum firing temperature which depend on the chemical composition of Ln element. An optimum firing temperature is obtained at 925℃ for Ce composition, at 950℃ for Sc, Y, La, Pr, Nd, Tb, Dy, Ho, Er, Tm, Yb, Lu compositions and at 1000℃ for Sm, Eu, Gd compositions, for 6 hours soaking time, respectively. Ln-Ba-Cu-O ceramics with Ln is Y, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm and Yb show the superconducting properties at liquid nitrogen temperature. Ceramics sintered at optimum temperature show the lowest resistivity from room temperature to onset temperature and the calculated Jc from the magnetization curves show highest value of 650A/cm^2.
湘南工科大学の論文
1991-03-31