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Pachmayr, U.; Fehn, N.; Johrendt, Dirk (2016): Structural transition and superconductivity in hydrothermally synthesized FeX (X = S, Se). In: Chemical Communications, Vol. 52, No. 1: pp. 194-197
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Abstract

Iron selenide obtained by mild hydrothermal reaction is not superconducting and exhibits a triclinic crystal structure below 60 K unlike superconducting FeSe from conventional solid state synthesis which is orthorhombic. In contrast, tetragonal iron sulphide FeS from hydrothermal synthesis is superconducting but undergoes no structural change on cooling.