Experimental Study of the Intergranular Weak Link Structures YBa_2Cu_3O_(7-x) with the Help of Magnetization Measurements

摘要

AC and DC virgin magnetizations of sintered YBa2Cu301mX samples have been measured in dependence of the sintering temperature. The samples were prepared by solid state reaction of swichiometric decarbonated mixture ofY2O2, BaCO3 and CuO components. Magnetization curves were measured at 77 K in the range of magnetic field flO"1 - 2xlO4 Am"1/ The temperature of sintering was being changed in the range 910°C up to 950°C. In the range of weak magnetization fields the magnetization curves are affected by properties of the intergranular medium - the intergranular weak links. The parameters tf^and Hf characterising the flux penetration into intergrain and intragrain mdium were estimated from the magnetization measurements.