MOD oxide buffer layers on metallic substrates for YBCO coated conductors

Abstract

We present a detailed study carried out on oxide buffer layers grown by Metal-Organic Decomposition (MOD) on metallic substrates for YBa 2Cu3O7-x (YBCO) coated conductor applications. Precursor solutions have been made starting from acetates or pentanedionates and characterized by means of Differential Scanning Calorimetry (DSC) and Thermogravimetric (TG) analyses coupled with Fourier Transform Infra-Red spectroscopy (FT-IR). Thin buffer layers have been grown by spin-coating on Ni-5at.%W substrates. X-ray diffraction spectra (XRD), Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM) have been employed in order to optimize buffer layers in terms of film microstructure and surface quality, with the final aims of producing a suitable template for YBCO growth. It will be shown that the optimization of the recrystallization process can lead to high quality buffer layer allowing the growth of YBCO films showing good superconductive properties. Copyright © Materials Research Society 2013

Epitaxial Zr-doped CeO2 films by chemical solution deposition as buffer layers for Fe(Se,Te) film growth

“…The precursor solution was deposited on the substrate, spinned at 2000 or 3000 rpm for 1 min to reach a uniform thickness and dried for 15 min at 120 • C. Precursor solution conversion was carried out by heating the sample in a tubular furnace using thermal ramps of 20 • C min −1 up to 1050 • C in air or in flowing Ar 5% H 2 (Ar-H 2 ). In the latter case, the high-temperature annealing was preceded by a low-temperature pyrolysis step in air or in flowing CO 2 [23].…”

“…In this contribution, we investigate the use of Zr-doped CeO 2 film by CSD as buffer for epitaxial Fe(Se,Te) film growth. Doped CeO 2 was chosen primarily because Zr doping is able to stabilize oxygen content in CeO 2 at high temperature and leads to films with reduced roughness with respect to undoped CeO 2 [23,24]. Furthermore, doped CeO 2 can be obtained using conversion heat treatment at reduced temperature with respect to undoped CeO 2 .…”