Composite materials on high- Tc superconductors and BaPbO 3, Ag basis

Abstract

The preparation, processing and characterization of the composite materials on high- T c superconductor (HTSC) basis, YBa 2Cu 3O 7/Ag and Y 0.75Lu 0.25Ba 2Cu 3O 7/BaPbO 3, is reported. The initial components YBa 2Cu 3O 7 and BaPbO 3 were prepared by the standard solid state reaction technique. The microstructures of the samples were observed by scanning electron microscopy, whilst the XRD paterns of the composites HTSC+Ag and HTSC+BaPbO 3 revealed the 123 superconducting phase and the Ag or BaPbO 3 structure. The chemical compositions of the powders and the interface zone were found by employing energy dispersive spectrometry. The resistive and magnetic measurements of the composites indicated the transition temperature 93.5 K. Application of such composite materials in the construction of a superconducting fault current limiter model is reported.