High critical current YBCO coated conductors based on IBAD MgO

Abstract

This report describes recent developments of second-generation Y 1 Ba 2 Cu 3 O 7Àd (YBCO) coated conductors deposited on biaxially textured MgO templates. The materials system architecture implemented to achieve high critical currents in YBCO films is described. The average full-width at half maximum (FWHM) in-plane texture obtained for MgO films processed on meter-length tapes is 7°, while that for the YBCO films is 3°. The best YBCO in-plane values approach 2°and the out-of-plane values approach 1°. Critical currents (1 cm wide tapes, 75 K, self field) have attained 423 A for 7 cm length and 233 A for 50 cm length tapes.

Properties of YBa2Cu3O7−δ Superconducting Films on Sr2YSbO6 Buffer Layers

“…The architecture of the superconducting tapes is like the buffered YBa 2 Cu 3 O 7−δ films showing in figure 7, but with additional protective layer of gold or silver and with the single substrate replaced for a flexible tape of commercially alloy textured with an oxide layer. The most promising technology for the manufacture of coated conductor tape is based on Ion Beam Assisted Deposition (IBAD) (Arendt et al, 2004;Foltyn et al, 2007), where MgO and Gd 2 Zr 2 O 7 are successfully used for texturing. Intermediate oxide layers are epitaxially grown on this textured substrate.…”

“…To fabricate templates of great length, the most promising approach is, generally, with ion beam assisted deposition, IBAD yttria-stabilized zirconia (YSZ), Gd 2 Zr 2 O 7 or MgO (Arendt et al, 2004;Groves et al, 2002;Hanyu et al, 2007;Koa et al, 2007). Of these, the best is IBAD-MgO because very good biaxial texture can be obtained with films only 10 nm thick, which reduces the production costs (Arendt et al, 2004;Foltyn et al, 2007;Koa et al, 2007). Section 3 is extended a bit the issue of buffer layers and materials used in them.…”

Investigation of Early Nucleation Events in Magnesium Oxide During Ion Beam Assisted Deposition

“…Researchers have continued to improve the IBAD MgO process and adapt it to continuous processing. Most notably, researchers at Los Alamos National Laboratory (LANL) have succeeded in improving the in-plane alignment of biaxially aligned polycrystalline IBAD MgO films with phi-scan full-width at half-maximum (FWHM) values of 5° having been routinely achieved on continuously processed metal tape 11 . These improvements have consisted of developing new IBAD MgO nucleation layers and optimizing ion gun processing parameters.…”

Effect of CeO2 buffer layer thickness on the structures and properties of YBCO coated conductors

“…IBAD produces textured films on a nontextured metallic substrate by ion source bombardment of the substrate at a channeling angle during film deposition [12,13]. ISD is characterized by growth of a biaxially textured film from inclination of the substrate with respect to the flux of the target material.…”