| 摘要 |
PURPOSE:To obtain an oxide superconductor having remarkably high critical current density by cooling the powder of single crystal of superconductive oxide substrate under the critical temp. and impressing magnetic field while imparting vibration and orientating crystal orientation and press-molding the powder of single crystal. CONSTITUTION:(i) Superconductive substance being polycrystalline substance is pulverized to obtain powder of single crystal. (ii) The powder 1 of this single crystal is introduced into a molding vessel and cooled under the critical temp. of superconductive substance by liquid nitrogen, etc., and made a superconductive state. (iii) Magnetic field B is impressed while vibrating the powder 1 of single crystal by imparting mechanical vibration such as ultrasonic wave vibration to the molding vessel 2. This state is held until crystal orientation is orientated to the direction becoming c-axis//B and the powder 1 of single crystal is collected to the upper part of the molding vessel 2. (iv) When the powder 1 is sufficiently collected, vibration is stopped. The power 1 is pressed, e.g. from the lower part and molded in such a state that the magnetic field has being imparted. After molding, the molded body is sintered to obtain a sintered body. |
