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Crystal structure of Sr3Fe2O7−δ

✍ Scribed by K. Mori; T. Kamiyama; H. Kobayashi; S. Torii; F. Izumi; H. Asano

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
129 KB
Volume
60
Category
Article
ISSN
0022-3697

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✦ Synopsis

The crystal structure of Sr 3 Fe 2 O 7Ϫd with iron in the average oxidation state ϩ 4 has been studied by time-of-flight neutron powder diffraction. The diffraction data were collected at more than 30 points between 18 and 300 K.

A slight anomalous behavior in lattice parameters was observed at around 120 K. In addition, thermal expansion is anisotropic above 120 K whereas isotropic below this temperature. These phenomena are not caused by magnetic order which occurs at 100 K. Although this first finding is most likely related to the structural changes arising from the charge ordering, i.e. the disproportionation of Fe 4ϩ , structural models with two or more sites of Fe ions did not improve R-factors in Rietveld refinements.

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