Determination of foreign phases in Fe–As based superconducting systems

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The recently discovered superconducting materials, containing Fe and As, have raised huge interest. However most materials prepared to date, suffer from a varying degree of content of foreign phases, Fe2As, FeAs2 and FeAs, which can lead to wrong conclusions concerning the properties of these materials. Mössbauer Spectroscopy determines quite easily the relative content of the foreign phases. This procedure is demonstrated by a study of eight samples of three Fe–As based families of materials, RAsFeO1−xFx, Sr1−xKxFe2As2 and LiFeAs, prepared in three different laboratories.

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