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.
U. Pachmayr, N. Fehn and D. Johrendt, Chem. Commun., 2016, 52, 194 DOI: 10.1039/C5CC07739G
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