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Nanomaterials 2012, 2(3), 298-311; doi:10.3390/nano2030298

Aqueous Chemical Solution Deposition of Novel, Thick and Dense Lattice-Matched Single Buffer Layers Suitable for YBCO Coated Conductors: Preparation and Characterization

Sol-Gel Centre for Research on Inorganic Powders and Thin Film Synthesis SCRiPTS, Department of Inorganic and Physical Chemistry, Ghent University, Krijgslaan 281-S3, Gent B-9000, Belgium
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Received: 6 July 2012 / Revised: 14 August 2012 / Accepted: 28 August 2012 / Published: 10 September 2012
(This article belongs to the Special Issue New Developments in Nanomaterial Analysis)
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Abstract

In this work we present the preparation and characterization of cerium doped lanthanum zirconate (LCZO) films and non-stoichiometric lanthanum zirconate (LZO) buffer layers on metallic Ni-5% W substrates using chemical solution deposition (CSD), starting from aqueous precursor solutions. La2Zr2O7 films doped with varying percentages of Ce at constant La concentration (La0.5CexZr1−xOy) were prepared as well as non-stoichiometric La0.5+xZr0.5−xOy buffer layers with different percentages of La and Zr ratios. The variation in the composition of these thin films enables the creation of novel buffer layers with tailored lattice parameters. This leads to different lattice mismatches with the YBa2Cu3O7−x (YBCO) superconducting layer on top and with the buffer layers or substrate underneath. This possibility of minimized lattice mismatch should allow the use of one single buffer layer instead of the current complicated buffer architectures such as Ni-(5% W)/LZO/LZO/CeO2. Here, single, crack-free LCZO and non-stoichiometric LZO layers with thicknesses of up to 140 nm could be obtained in one single CSD step. The crystallinity and microstructure of these layers were studied by XRD, and SEM and the effective buffer layer action was studied using XPS depth profiling.
Keywords: buffer layers; water-based precursors; chemical solution deposition; thin films; lattice-mismatch buffer layers; water-based precursors; chemical solution deposition; thin films; lattice-mismatch
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Narayanan, V.; van Steenberge, S.; Lommens, P.; van Driessche, I. Aqueous Chemical Solution Deposition of Novel, Thick and Dense Lattice-Matched Single Buffer Layers Suitable for YBCO Coated Conductors: Preparation and Characterization. Nanomaterials 2012, 2, 298-311.

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