Influence of Substrate-Film Reactions on YBCO Grown by Fluorine-Free MOD Route

Yue Zhao, Xiao Tang, W. Wu, Jean-Claude Grivel

Research output: Contribution to journalJournal articleResearchpeer-review

141 Downloads (Pure)

Abstract

Recently, fluorine-free metal organic deposition routes (FF-MOD) for growth of YBCO superconducting films have attracted increased attentions. In this paper, a comparison study was performed on the YBCO-Ag superconducting thin films deposited on two types substrates, LaAlO3 and CSD-Ce0.9La0.1O2-y (CLO)/YSZ, respectively. Although conventional TFA-MOD derived YBCO films exhibit high performance on both substrates, the results vary when using the FF-MOD precursor. SEM and XRD results reveal that c-axis and a/b-axis orientations coexist in the YBCO-Ag films grown on the CSD-CLO/YSZ substrate deposited by the FF-MOD route, while the BaCeO3 by-product is a dominating phase in the fully reacted film. Based on the structural analysis of the partially converted films, we found that interfacial reactions between the film and the CLO cap layer play an essential role on the epitaxial growth of YBCO-Ag films from the FF-MOD solution. Because of the different chemical reaction path compared to conventional TFA-MOD routes, it seems that the polycrystalline BaCeO3 formation takes place prior to the YBCO-Ag epitaxial growth associated with the melting process, which results in structural deterioration at high growth temperatures and, therefore, no superconductivity. This study indicates the necessity of further reducing the nucleation temperature of YBCO films processed by FF-MOD routes.
Original languageEnglish
JournalI E E E Transactions on Applied Superconductivity
Volume27
Issue number4
Number of pages4
ISSN1051-8223
DOIs
Publication statusPublished - 2017

Keywords

  • Fluorine-free solution
  • YBCO films
  • All-chemical-solution route
  • Interface reaction

Fingerprint Dive into the research topics of 'Influence of Substrate-Film Reactions on YBCO Grown by Fluorine-Free MOD Route'. Together they form a unique fingerprint.

Cite this