The stability of the Sr4Fe6O13 phase, and the phase changes taking place in the presence of Co, are discussed. Reported transport parameters are analysed and discussed in relation to defects and phase changes in SrFe1,5-хCoхOz. A defect model is suggested that is in qualitative agreement with the observed transport parameters. It is suggested that defect ordering dueto Co2+ ions is decisive for the transport properties.
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