Phase equilibria in the pseudo-binary system SrO-Fe2O3 |
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Authors: | Anita Fossdal |
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Institution: | Department of Materials Technology, Norwegian University of Science and Technology, Sem Saelands vei 12, Trondheim 7491, Norway |
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Abstract: | The phase relations in the pseudo-binary system SrO-Fe2O3 have been investigated in air up to 1150°C by means of powder X-ray diffraction and thermal analysis. Sr3Fe2O7−δ, SrFeO3−δ and SrFe12O19 are stable phases in the entire investigated temperature region, whereas Sr2FeO4−δ and Sr4Fe3O10−δ decompose above 930±10°C and 850±25°C, respectively. Sr4Fe6O13±δ is entropy-stabilized relative to SrFeO3−δ and SrFe12O19 above 775±25°C. Extended solid-solution Sr1±xFeO3−δ was demonstrated. On the Fe-deficient side, the extent of solid solubility appeared to decrease gradually with temperature, whereas an abrupt decrease due to formation of Sr4Fe6O13±δ was observed above 775°C on the Sr-deficient side. |
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Keywords: | Phase diagram Solid solution SrO-Fe2O3 Stability |
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