Biaxially textured YBa2Cu3O7-x films deposited on polycrystalline flexible yttria-stabilized zirconia ceramic substrates

摘要

Biaxially textured YBa2Cu3O7-x (YBCO) films were grown on polycrystalline flexible yttria-stabilized zirconia (YSZ) ceramic substrates (Ceraflex) buffered with MgO and LaMnO3 layers. These substrates were initially coated with silica glass to obtain a smooth surface and then biaxially textured MgO buffer layers were deposited by ion beam assisted deposition (IBAD-MgO). Lanthanum manganate (LMO) cap layers and YBCO layers were then deposited by the pulsed laser ablation method. Highly textured YBCO films with a full width half maximum (FWHM) of 6.75 degrees in (110) phi scans and a FWHM similar to 5 degrees in (200) omega An initial deposition yielded samples with a T-c > 88 K and a self-field magnetization scans were obtained. 2 J(c) of 2 x 10(5) A/cm(2) at 77 K. A secondary ion mass spectrometry (SIMS) depth profile of the samples indicated that with the present deposition condition. some La, Mn and Mg diffusion into the YBCO layers is possible and this may reduce the Jc in the self-field. The yield strength (YS) of uncoated Ceraflex substrates was compared with that of metallic substrates and it was found that Ceraflex substrates can have a YS at least 4-5 times higher than the YS of biaxially textured Ni-5 at.%W substrates and similar to 1.5 times that of Hastelloy (TM) substrates. (c) 2008 Elsevier B.V. All rights reserved.