Growth of Hgo.gReo.lBa2Ca2Cu30st, on a Metallic Substrate

The large-scale application of any high- temperature superconductor will require a metallic sheath to satisfy the mechanical and thermal require- ments of superconducting magnets. Thus, an impor- tant step in the development of a high temperature superconductor is to study the properties of the su- perconductor in contact with a metallic surface. Due to the highly corrosive atmosphere necessary for the synthesis of Hgo.9Reo.l Baz Caz Cu3Og+. ((Hg,Re)1223) the selection of a suitable metal substrate is critical. In this study, we investigate the synthesis of (Hg,Re)1223 samples on Ag, AgHg, Au, and Pt substrates. The samples were prepared by mixing precursor powders in a dry methanol solution which was then pipette- dropped or centrifuge coated onto the metal sub- strates. The samples were encapsulated in quartz and annealed. Microstructural analysis of phase growth and grain alignment at the superconductor/metal in- terface were carried out on multiple length scales via x-ray diffraction, scanning electron microscopy, and x- ray microanalysis. Magnetic characterization has been carried out in a SQUID magnetometer.