Preparation of a Novel ${\rm Ce}_{0.9}{\rm La}_{0.1}{\rm O}_{2}/{\rm Gd}_{2}{\rm Zr}_{2}{\rm O}_{7}$ Buffer Layer Stack on NiW Alloy Substrates by the MOD Route

Abstract

An optimized buffer layer architecture prepared by a metal organic deposition method on biaxially textured metallic substrate is proposed and developed successfully. The major achievement of this work is to choose a Ce 0 9 La 0 1 O 2 layer as cap layer that possesses an excellent lattice match with the superconductor layer, and to employ 200 nm thick Gd 2 Zr 2 O 7 film as barrier layer. The effect of thermal cycling on the texture and morphology of the crystallized films and NiW substrate is discussed in detail. The texture quality and the epitaxial relationship between the buffer layer stack and the metallic substrate were studied by synchrotron x-ray diffraction. Well textured, smooth and crack-free Ce 0 9 La 0 1 O 2 Gd 2 Zr 2 O 7 buffer layer stacks are obtained, demonstrating the possibility of producing a high quality buffer layer stack by a low cost chemical solution deposition route.

Evolution of microstructure, texture and topography during additional annealing of cube-textured Ni–5at.%W substrate for coated conductors

“…The sample was then additionally annealed in the protective atmosphere at 1025°C for 1 h (condition A2). This temperature is within the range of that frequently used for buffer layer crystallization [13,[15][16][17][18]. It is pertinent to mention that no evidence of secondary recrystallization was found in the given sample even when additional annealing was conducted at 1100°C for 1 h. Vickers microhardness was measured in the annealed samples using a load of 200 g with a 15 s dwell time.…”

“…For example, crystallization of buffer layers [13,15] may be performed at higher temperatures than those used to anneal the substrate, which will likely increase the extent of GB grooving and may also modify the microstructure and texture of the substrate. These changes will inevitably affect characteristics of the buffer layer and, eventually, of the YBCO superconducting layer [8,13].…”

Epitaxial growth of YBa2Cu3O7−x films on Ce0.9La0.1O2−y buffered yttria-stabilized zirconia substrates by an all-chemical-solution route

“…The CLO cap layers were prepared by the propionatebased metal-organic deposition (MOD) route which has been reported previously. 7,8 Under optimized coating and heat treatment conditions, high quality films of about 20 nm thickness were prepared and used for further YBCO deposition. The low-fluorine MOD solution for YBCO films was prepared as follows.…”

Controlled growth of epitaxial CeO2 thin films with self-organized nanostructure by chemical solution method

“…CeO 2 films were prepared by a propionic acid based metalorganic decomposition (MOD) route, as reported previously. 17,18 The total cation concentration of the precursor solution and the withdrawal speed for coating the wet films by dip coating were fixed at 0.3 mol L 21 and 20 mm min 21 , respectively. Textured NiW alloy tapes (Evico GmbH) were used as the substrate.…”