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Crystals 2016, 6(11), 146; doi:10.3390/cryst6110146

Influence of Phase Transformations on Crystal Growth of Stoichiometric Brownmillerite Oxides: Sr2ScGaO5 and Ca2Fe2O5

Institut Charles Gerhardt, UMR 5253 CNRS-Université Montpellier, C2M, 5 Pl. Eugene Bataillon, 34095 Montpellier, France
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Academic Editor: Ekaterina Pomjakushina
Received: 18 October 2016 / Revised: 1 November 2016 / Accepted: 8 November 2016 / Published: 12 November 2016
(This article belongs to the Special Issue Traveling Solvent Floating Zone (TSFZ) Method in Crystal Growth)
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Abstract

High quality stoichiometric brownmillerite-type oxide single crystals have been successfully grown by the floating zone method using a mirror furnace. We report here on the growth conditions and structural characterization of two model compounds: Ca2Fe2O5 and Sr2ScGaO5. Both show oxygen deficiency with respect to the average perovskite structure, and are promising candidates for oxygen ion conductivity at moderate temperatures. While Sr2ScGaO5 single crystals were obtained in the cubic oxygen-deficient perovskite structure, Ca2Fe2O5 crystallizes in the brownmillerite framework. Having no cubic parent high temperature counterpart, Ca2Fe2O5 crystals were found to be not twinned. We report on structural characterization of the as-grown single crystals by neutron and X-ray diffraction, as well as scanning electron microscopy (SEM) coupled with EDX (Energy Dispersive X-Ray Spectroscopy) analysis and isotope exchange experiments. View Full-Text
Keywords: brownmillerite; oxygen ion conduction; single crystal growth; floating zone method; neutron diffraction brownmillerite; oxygen ion conduction; single crystal growth; floating zone method; neutron diffraction
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Ceretti, M.; Corallini, S.; Paulus, W. Influence of Phase Transformations on Crystal Growth of Stoichiometric Brownmillerite Oxides: Sr2ScGaO5 and Ca2Fe2O5. Crystals 2016, 6, 146.

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