Abstract
The high-temperature cubic phase of non-stoichiometric strontium ferrite SrFeOx (2.5 ≤ x ≤ 3.0) has been studied by in situ neutron powder diffraction in air over the temperature range 300-1273 K. The composition of SrFeOx changes within the range 2.56 ≤ x ≤ 2.81 from 1273 to 673 K, respectively. Rietveld refinements of the diffraction patterns show that the high-temperature cubic phase of SrFeOx is consistent with a face-centred Fm3c structure. This structure leads to agreement with previous density measurements. This cell allows the high-temperature structure of SrFeOx to be described in terms of a solid solution of the composition end members. Cubic SrFeOx at high temperature is found to closely obey Vegard's law. The density of cubic SrFeOx is also found to exhibit a linear relationship with composition.
Original language | English |
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Pages (from-to) | 2085-2092 |
Number of pages | 8 |
Journal | Journal of Physics and Chemistry of Solids |
Volume | 63 |
Issue number | 11 |
DOIs | |
Publication status | Published - Nov 2002 |