Rapid phase formation and interfacial reaction of YBa 2 Cu 3 O 7−δ coated conducts by using high-rate crystallization of fluorine-free chemical solution

In the present work, the high-rate epitaxial growth for superconducting YBa 2 Cu 3 O 7- δ (YBCO) films on the substrates of LaMnO 3 (LMO)/IBAD-MgO/Y 2 O 3 /Al 2 O 3 /Hastelloy is achieved by fluorine-free metal organic deposition (FF-MOD) by rapidly switching the partial oxygen pressure ( p O 2 ) at a fixed temperature. Further investigation into the effects of temperature and switching p O 2 on the phase transition of YBCO elucidates that the growth mode and microstructural characteristics of the studied films. BaMnO 3 heterogeneous particles are observed in localized regions in the films by cross-sectional transmission electron microscopy, 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 the rapid growth of YBCO films on LMO buffered metallic substrates, regardless of interfacial reactions during the preparation.