PROPERTIES AND MICROSTRUCTURES OF MELT PROCES-SED (YHo)Ba2Cu3O7-y SUPERCONDUCTOR
粉末熔化法(YHo)Ba2Cu3O7-y超导体的性能与微结构

We have prepared (YHo) Ba2Cu3O7-y superconductors with hige Jc value by powder melting process (PMP) method. The DTA result shows that the melting temperature of Y-system superconductor can be reduced by Ho addition. The Jc value can be improved and the size of 211 phase can be reduced by Ho substitution. Microstructures and X-ray diffraction pattern indicate that the 123 grains are preferentaially aligned with mutually parallel a-b conductive planes. There are a number of twins and fine 211 particles in the sample. It is also found that many crystal defects exist around the 211 phase. These defects may act as pinning centers.