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Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/6517

Title: Single-Crystal Neutron Diffraction Study of Superstructure Ordering and Domain Behaviour in Brownmillerite-Type Ca2Fe2O5
Authors: Auckett, JE
Studer, AJ
Ling, CD
Keywords: MONOCRYSTALS
NEUTRON DIFFRACTION
NEUTRONS
EXPERIMENT PLANNING
ZONE MELTING
THERMAL CONDUCTION
Issue Date: 15-Sep-2014
Publisher: CSIRO Publishing
Citation: Auckett, J. E., Studer, A. J., & Ling, C. D. (2014). Single-Crystal Neutron Diffraction Study of Superstructure Ordering and Domain Behaviour in Brownmillerite-Type Ca2Fe2O5. Australian Journal of Chemistry, 67(12), 1824-1828. doi: http://dx.doi.org/10.1071/CH14358
Abstract: We show that large single crystals of brownmillerite-type Ca2Fe2O5 can be grown using the floating-zone method under ambient pressure conditions, provided that the feed rods are pre-annealed to a very high density. Neutron diffraction data collected from these crystals show the emergence of a long-range ordered incommensurate phase at high temperature. The observation of this phase for the first time using neutrons proves that the incommensurate ordering of tetrahedral chains upon heating Ca2Fe2O5 is a truly long-range and bulk phenomenon. The results are used to compare and contrast the structures of Ca2Fe2O5 and Sr2Fe2O5, and are consistent with experimental observations of significantly higher oxide ionic conduction in the latter material.
URI: http://dx.doi.org/10.1071/CH14358
http://apo.ansto.gov.au/dspace/handle/10238/6517
ISSN: 0004-9425
Appears in Collections:Journal Articles

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