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In situ neutron diffraction study (300-1273 K) of non-stoichiometric strontium ferrite SrFeOx |
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| Authors: | M Schmidt SJ Campbell |
| Institution: | a ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, UK b Institute of Molecular Physics Polish Academy of Science, ul. Smoluchowskiego 17, 60-179 Poznan, Poland c Department of Applied Mathematics and Department of Electronic, Materials Engineering, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT 0200, Australia d School of Physics, University College, The University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600, Australia |
| 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. |
| Keywords: | A Oxides C Neutron scattering C Thermogravimetric analysis (TGA) D Crystal structure D Phase transitions |
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