Preparation of {110} textured Ag ribbons for biaxially aligned superconducting tapes

Abstract

The aim of our work is to produce biaxially aligned HTS conductors by epitaxial growth on textured Ag. This paper will focus on the preparation of long length textured Ag ribbons.After cold rolling and annealing in vacuum at 800"C, different { llO}cuvw> directions appear in the recrystallized pure Ag ribbons. The {11O}c112> texture is obtained after cold rolling by adding a 500°C step before the annealing at 800°C. If the Ag ingots are annealed at 600°C in vacuum before the cold rolling, the 800°C annealing leads to a sharp {11O}cO11> texture. The quality of the texture is studied by X-ray and electronic diffraction. Three X-ray pole figures are used to calculate the ODF function, a SEM is used to obtain orientation maps from EBDP. The surface roughness is studied by AFM. We have produced lengths of 25 cm with a sharp {110}<112> texture (FWHM=7", ODF peak). The characteristics of the two { 110}<112> and {11O}cO11> orientation are presented in details.It is shown that those {llO} ribbons are suitable for epitaxial growth of superconducting cuprates. The Ag textured ribbons are used as substrates for different superconducting systems such as TI-1223 and Y123.

Reinforced {110} textured Ag/Ni composite ribbons for biaxially oriented YBCO coated tapes

“…A weak {110} 011 texture was obtained in Ar-1% H 2 annealed Ag-1 wt% Mg ribbons by Gladstone et al [19]. As in our previous studies [18,34], the authors mention the crucial rule of oxygen contamination during the texturing process but the effect of a second annealing for internal oxidation was not studied.…”

“…Different kinds of textures such as {100} 001 [15,33], {110} 112 [16] and {110} 011 [18,19,34] can be produced in pure Ag by particular deformation and recrystallization processes. From the point of view of epitaxial growth, the (110) Ag orientation is the most appropriate for the preparation of superconducting tapes [11,14], the {110} 011 texture being preferred because of the particular twins of the {110} 112 texture [34]. A key factor in obtaining the {110} 011 texture in pure Ag is to control the oxygen content in the initial ingot before the deformation [19].…”

“…A key factor in obtaining the {110} 011 texture in pure Ag is to control the oxygen content in the initial ingot before the deformation [19]. By annealing the initial ingot in an inert atmosphere, any oxygen contamination is removed and the {110} 011 texture is formed after cold deformation and recrystallization at 800 • C [18,34]. A similar process was therefore used to control the texture formation in composite Ag ribbons.…”

“…A high degree of texturing was recently obtained for YBCO films by spray pyrolysis on {110} 011 textured Ag tapes with a FWHM of 4 • in the x-ray φ-scans [13,14]. Furthermore, it has been shown that it is possible to form stable {100} 001 [15], {110} 112 [16,17] or {110} 011 [18,19,34] texture under the correct processing conditions. Critical current densities of 10 kA cm −2 at 77 K in a field of 1 T and 2×10 5 A cm −2 in self field were measured on Y123 films grown by metalorganic chemical vapour deposition (MOCVD) on polycrystalline [20] and {110} 011 textured [21] (see also [12]) Ag substrates, respectively.…”

Future Circular Collider beam screen: progress on Tl-1223 HTS coating

“…The films are realized by electrochemical deposition in a 3-electrode system on suitable substrates: silver [12] and strontium titanate (STO, SrTiO 3 ) intentionally metallized via sputtering; a flat cell is employed. The working, counter and reference electrodes are the chosen substrate, platinum grid, and Ag/AgNO 3 0.1 M in Dimethyl Sulfoxide (DMSO, Sigma-Aldrich, 99.9%, anhydrous, suresealed grade), respectively.…”