Synthesis and characterisation of the SrxBa1?xFeO3?y-system and the fluorinated phases SrxBa1?xFeO2F |
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Authors: | Oliver Clemens Robert Haberkorn Peter R Slater Horst Philipp Beck |
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Institution: | 1. Universität des Saarlandes, Institut für Anorganische und Analytische Chemie und Radiochemie, Fachrichtung 8.1, Gebäude C4.1, 66123 Saarbrücken, Germany;2. University of Birmingham, School of Chemistry, Birmingham B15 2TT, United Kingdom |
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Abstract: | Compounds in the system SrxBa1?xFeO3?y have been prepared under different partial pressures of oxygen. In this system, different perovskite-type structures are found depending highly on the values of x and y. Fluorination using polyvinylidenedifluoride (PVDF) gives oxyfluoride materials of composition SrxBa1?xFeO2F, which normally crystallize in the cubic perovskite structure. Rietveld refinement results provide information about the packing density for oxide and oxyfluoride samples and allow a general comparison between these two different types of materials. Furthermore, the determination of the average iron oxidation state also showed that the oxygen deficiency, y, depends significantly on the value of x and the structure determined by the Sr/Ba ratio. |
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