J. Mater. Sci. Technol. ›› 2013, Vol. 29 ›› Issue (3): 261-266.DOI: 10.1016/j.jmst.2012.12.020

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Effect of Polymer Inclusion in Preparation of Thick LZO Buffer Layers for YBCO Coated Conductors

Vyshnavi Narayanan, Isabel Van Driessche   

  1. Sol-gel Centre for Research on Inorganic Powders and Thin film Synthesis-SCRiPTS, Department of Inorganic and Physical Chemistry, Ghent University, Krijgslaan 281-S3, B-9000 Gent, Belgium
  • Received:2012-01-17 Revised:2012-05-24 Online:2013-03-30 Published:2013-03-19
  • Contact: Vyshnavi Narayanan
  • Supported by:

    Belgian Science Policy, IAP and EC for funding under the project grants P2/00/03 (CHEMAT), IAP/VI-17 (INANOMAT) and FP7-NMP-2007­SMALL-1 Grant No. 205854 (EFECTS).

Abstract:

In this work, water-based precursor solutions suitable for dip-coating of thick La2Zr2O7 (LZO) buffer layers for coated conductors on Ni-5%W substrates with an inclusion of polymeric polyvinyl pyrrolidone were developed. The effect of varying percentage of the polymer addition on the preparation of the deposited films with maximum crack-free thickness was investigated. This novel water-based chemical solution deposition method involving polymers in two different chelate-chemistry compositions revealed the possibility to grow single, crack-free layers with thicknesses ranging from 140 to 280 nm, with good crystallinity and epitaxial growth. The effect of increasing polymer concentrations on the morphology and the structure of the films was studied. The appropriate buffer layer action of the films in preventing Ni diffusion was studied by X-ray photoelectron spectroscopy.

Key words: Buffer layers, Thick lanthanum zirconate films, Chemical solution deposition, Polyvinyl pyrrolidone, Water-based precursor design, Coated conductors