| 摘要 |
PURPOSE:To obtain a multicomponent oxide superconductor in the form of a bulk crystal of high quality by using kyropouls method. CONSTITUTION:A Pt heater 2 is arranged to the inside of an alumina shielding material 1 and a Pt crucible 3 is supported on a base 4 at the center of the Pt heater. The base 4 is integrated with a supporting rod 5 connected to the outside of a furnace and is revolvable. A thermocouple 6 is provided to the base and a flux comprising a liquid mixture consisting of, for example, BaCO3 and B2O3 is formed in the crucible 3. A soln. 7 contg. Y2O3 and CuO dissolved therein is formed. After allowing the soln. to stand at about 1,200-1,300 deg.C for about 10hr, the temp. of the soln. is set at about 900-1,000 deg.C by cooling, then, a seed crystal of YCuO single crystal attached to a tip of a pulling shaft 8 is dipped in the soln. 7 and the seed crystal is allowed to be accustomed to the soln. Thereafter, a crystal 9 is pulled up with a specified low cooling velocity. In this stage, gaseous O2 is fed through a pipe 12 to the surface of the soln. 7. By this method, a YBa2Cu3O7-delta crystal having good quality is prepd. at relatively low temp., accordingly, without causing phase transition. |
