Nature of the transient BaF2-related phases in the “BaF2” processing of Ba2YCu3O7−x superconductors

Transient BaF2-based oxyfluoride phases are thought to play a critical role in the formation of the c-textured Ba2YCu3O7−x layers of coated conductors. In situ high-temperature x-ray diffraction from the precursor films containing pure BaF2 as well as pseudobinary BaF2–Y, BaF2–Cu, and Y–Cu mixtures...

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Bibliographic Details
Published in:Applied physics letters 2006-03, Vol.88 (10)
Main Authors: Wong-Ng, W., Levin, I., Cook, L. P., Feenstra, R.
Format: Article
Language:English
Subjects:
BARIUM COMPOUNDS
BARIUM OXIDES
COPPER OXIDES
FABRICATION
KINETICS
MATERIALS SCIENCE
OXYFLUORIDES
REACTION INTERMEDIATES
SUPERCONDUCTORS
VACANCIES
YTTRIUM OXIDES
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Summary:Transient BaF2-based oxyfluoride phases are thought to play a critical role in the formation of the c-textured Ba2YCu3O7−x layers of coated conductors. In situ high-temperature x-ray diffraction from the precursor films containing pure BaF2 as well as pseudobinary BaF2–Y, BaF2–Cu, and Y–Cu mixtures and heat treated in water vapor under reduced conditions revealed that the transient BaF2-based superstructures, similar to those observed during formation of Ba2Cu3O7−x, develop even from the pure BaF2 precursor. These superstructures results from the dissolution of oxygen in BaF2 leading to formation of the oxyfluoride phase, Ba(F2−2x◻x)Ox, with an ordered arrangement of O, F, and F vacancies.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2184757