%0 Journal Article
%A Auckett, Josie E.
%A Lee, Wai Tung
%A Rule, Kirrily C.
%A Bosak, Alexey
%A Ling, Chris D.
%D 2019
%T Order, Disorder, and Dynamics in Brownmillerite Sr2Fe2O5
%U https://acs.figshare.com/articles/journal_contribution/Order_Disorder_and_Dynamics_in_Brownmillerite_Sr_sub_2_sub_Fe_sub_2_sub_O_sub_5_sub_/9725030
%R 10.1021/acs.inorgchem.9b01846.s001
%2 https://acs.figshare.com/ndownloader/files/17417714
%K room-temperature structure
%K Brownmillerite Sr 2 Fe 2 O 5
%K Sr 2 Fe 2 O 5
%K electron diffraction data
%K brownmillerite-type Sr 2 Fe 2 O 5
%K satellite reflections
%K neutron diffraction
%K diffraction images
%K X-ray
%K length scales
%K tetrahedral chain
%K disagreements concern
%K b axis
%K FeO 4 tetrahedral chains
%K oxide ion transport
%K oxide-ionic conductivity
%K powder samples
%X The 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.
%I ACS Publications