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Order, Disorder, and Dynamics in Brownmillerite Sr2Fe2O5
journal contribution
posted on 2019-08-23, 12:09 authored by Josie E. Auckett, Wai Tung Lee, Kirrily C. Rule, Alexey Bosak, Chris D. LingThe room-temperature
structure of brownmillerite-type Sr2Fe2O5 remains controversial, despite numerous published crystallographic
studies utilizing X-ray, neutron, and electron diffraction data collected
on single-crystalline and powder samples. The main disagreements concern
the ordering of twisted FeO4 tetrahedral chains within
and between the layers stacked along the b axis,
and the impact of this ordering on oxide-ionic conductivity. Here,
we present new data along with a reinterpretation of previously published
diffraction images, including the reassignment of satellite reflections,
which harmonize the results of past studies in a unified description
of tetrahedral chain ordering in Sr2Fe2O5 at length scales relevant to X-ray and neutron diffraction.
Implications for the prevailing model of oxide ion transport in this
material are also discussed.
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room-temperature structureBrownmillerite Sr 2 Fe 2 O 5Sr 2 Fe 2 O 5electron diffraction databrownmillerite-type Sr 2 Fe 2 O 5satellite reflectionsneutron diffractiondiffraction imagesX-raylength scalestetrahedral chaindisagreements concernb axisFeO 4 tetrahedral chainsoxide ion transportoxide-ionic conductivitypowder samples
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