Effect of oxygen pressure in the sintering process of YBa₂Cu₃O_7−δ

Y. Masuda Department of Electric Engineering, Faculty of Engineering, Hachinohe Institute of Technology, 88-1, Ohbiraki, Myoh, Hachinohe, Aomori, 031, Japan

Y. Yokochi Department of Electric Engineering, Faculty of Engineering, Hachinohe Institute of Technology, 88-1, Ohbiraki, Myoh, Hachinohe, Aomori, 031, Japan

S. Fujita Department of Electric Engineering, Faculty of Engineering, Hachinohe Institute of Technology, 88-1, Ohbiraki, Myoh, Hachinohe, Aomori, 031, Japan

H. Seki Department of Electric Engineering, Faculty of Engineering, Hachinohe Institute of Technology, 88-1, Ohbiraki, Myoh, Hachinohe, Aomori, 031, Japan

Y. Sakamoto Department of Electric Engineering, Faculty of Engineering, Hachinohe Institute of Technology, 88-1, Ohbiraki, Myoh, Hachinohe, Aomori, 031, Japan

A. Baba Department of Electric Engineering, Faculty of Engineering, Hachinohe Institute of Technology, 88-1, Ohbiraki, Myoh, Hachinohe, Aomori, 031, Japan

A. Togasawa Department of Electric Engineering, Faculty of Engineering, Hachinohe Institute of Technology, 88-1, Ohbiraki, Myoh, Hachinohe, Aomori, 031, Japan

M. Baba Department of Electric Engineering, Faculty of Engineering, Hachinohe Institute of Technology, 88-1, Ohbiraki, Myoh, Hachinohe, Aomori, 031, Japan

T. Shintomi Department of Electric Engineering, Faculty of Engineering, Hachinohe Institute of Technology, 88-1, Ohbiraki, Myoh, Hachinohe, Aomori, 031, Japan; National Laboratory for High Energy Physics, 1-1, Oho, Tsukuba, Ibaraki, 303, Japan

M. Masuda Department of Electric Engineering, Faculty of Engineering, Hachinohe Institute of Technology, 88-1, Ohbiraki, Myoh, Hachinohe, Aomori, 031, Japan; National Laboratory for High Energy Physics, 1-1, Oho, Tsukuba, Ibaraki, 303, Japan

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Abstract

The paper describes the electric and magnetic properties of high T_c oxide superconductor, YBa₂Cu₃O_7-δ ceramics, and influence of the sintering oxygen pressure conditions. All specimens showed the super-conductivity sintered at 950°C, a various sintering oxygen pressure from 24.5 to 147 kPa. The magnetization (M) T _c-end and T _c-onset are found the maximum value at 73.6 kPa oxygen pressure, respectively. On the other hand, lattice constant of c-axis considerably decreases against oxygen pressure and obtained a minimum value at 74 kPa. This corresponds to the maximum of T_c and M constant maximum. It seems that the optimum amount of oxygen was obtained at this oxygen pressure. The average copper charge (ACC) was estimated there, as 2.32, which corresponds to oxygen composition of 7-δ = 6.98. The apparent density of ceramics is about 5.6 × 10³ kg/m³, which is about 90% of the theoretical one.

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Effect of oxygen pressure in the sintering process of YBa₂Cu₃O_7−δ

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Effect of oxygen pressure in the sintering process of YBa2Cu3O7−δ

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Effect of oxygen pressure in the sintering process of YBa₂Cu₃O_7−δ