Abstract
The effect of a magnetic field on the unidirectional solidification process of the high-Tc superconductor Bi2Sr2CaCu2Oy (Bi-2212) was studied. The apparatus used in this study was a high-frequency heating furnace located in the room-temperature bore of a superconducting magnet. A sinterad rod of Bi-2212 was put into an alumina tube, then moved parallel to the applied magnetic field direction through the high-frequency coil. The magnetic field intensity was about 7 T in the molten zone. After solidification, the initial and later parts of the samples thus obtained ware cut into blocks, and X-ray diffraction and magnetization measurements were performed to evaluate their orientations. When a conventional unidirectional solidification process such as the floating-zone method is used, Bi-2212 crystals tend to grow with their c-axes perpendicular to the direction of motion. On the other hand, when a high magnetic field is applied during the solidification process, samples with their c-axes parallel to the direction of motion were obtained. This phenomenon was due to the paramagnetic anisotropy of Bi-2212 crystals. It can be said therefore that a magnetic field can be used to control the grain orientations in melt-solidification processes of even feeble magnetic substances.
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