Initial magnetization property and microstructure of superconducting ceramics

M. Matsuda Department of Electrical Engineering, Nagaoka University of Technology, Niigata, 940-21, Japan

K. Nakajima Department of Electrical Engineering, Nagaoka University of Technology, Niigata, 940-21, Japan

M. Takata Department of Electrical Engineering, Nagaoka University of Technology, Niigata, 940-21, Japan

T. Yamashita Department of Electrical Engineering, Nagaoka University of Technology, Niigata, 940-21, Japan

K. Yamashita Department of Industrial Chemistry, Faculty of Technology, Tokyo Metropolitan University, Hachioji, Tokyo, 192-03, Japan

T. Umegaki Department of Industrial Chemistry, Faculty of Technology, Tokyo Metropolitan University, Hachioji, Tokyo, 192-03, Japan

Abstract

Initial magnetization properties below H_cl were investigated for superconducting ceramics with different microstructures. The change of the magnetization curve which resulted from magnetic flux penetration into the grain boundaries was observed in all sintered specimens. For specimens with a porous structure or a second phase at the grain boundaries, the magnetic flux easily penetrated into the grain boundaries and distributed uniformly. In contrast, for dense specimens without a second phase, magnetic flux penetration into the grain boundaries did not occur so easily and flux distribution was very hard.

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Initial magnetization property and microstructure of superconducting ceramics

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Initial magnetization property and microstructure of superconducting ceramics

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