Rapid phase formation and interfacial reaction of YBa₂Cu₃O_7−δ coated conducts by using high-rate crystallization of fluorine-free chemical solution

Abstract

In the present work, the high-rate epitaxial growth for superconducting YBa2Cu3O7-δ (YBCO) films on the substrates of LaMnO3(LMO)/IBAD-MgO/Y2O3/Al2O3/Hastelloy is achieved by fluorine-free metal organic deposition (FF-MOD) by rapidly switching the partial oxygen pressure (pO2) at a fixed temperature. Further investigation into the effects of temperature and switching pO2 on the phase transition of YBCO elucidates that the growth mode and microstructural characteristics of the studies films. BaMnO3 heterogeneous particles is observed in localized regions in the films by cross-sectional transmission electron microscopy (TEM), which may be generated by the interfacial reactions between the substrate and transient liquid phases. The present work implies the feasibility of FF-MOD for rapid growth of YBCO films on LMO buffered metallic substrates, regardless of interfacial reactions during the preparation.