This paper reports that in REBa2Cu3O7−δ
(RE123 or REBCO, RE = Y or rare earth)-coated conductors (CCs) prepared by ex situ metal–organic deposition (MOD), it is feasible to obtain YBa2Cu4O8-type stacking faults (Y124-type SFs) by a post-annealing treatment, and hence to improve its microstructures as well as the critical current (I
c) at 77 K. Detailed studies show that the formation and evolution of Y124-type SFs plays an important role in I
c improvement for MOD-derived YBCO CCs, with an increase of I
c(77 K) as large as 50 ∼ 120 A for samples 12 mm in width. This cost-effective approach implies great commercial value for scaled processing.
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.
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