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Dy2Fe2Si2C: A new structure derived from Ge2Os and stabilized by carbon

1988; Elsevier BV; Volume: 136; Issue: 2 Linguagem: Inglês

10.1016/0022-5088(88)90433-x

1878-2728

L. Paccard, D. Paccard,

Iron-based superconductors research

X-ray diffraction studies of Dy2Fe2Si2C single crystals were used to establish the crystal structure, with space group C2m and lattice constants a = 10.581(3) Å, b = 3.912(2) Å, c = 6.734(1) Å, β = 129.15(3)° and V = 216 (2) Å3. The crystal structure is derived from the Ge2Os type with an ordered replacement of germanium atoms by dysprosium and iron atoms and of osmium atoms by silicon atoms and with an addition of carbon atoms between the isolated infinite columns of silicon-centred double prisms. One carbon atom is at the centre of an octahedron where the six vertices are occupied by four dysprosium and two iron atoms. Pr2Fe2Si2C, Nd2Fe2Si2C, Gd2Fe2Si2C, Tb2Fe2Si2C, Ho2Fe2Si2C, Er2Fe2-Si2C, Y2Fe2Si2C are isostructural with Dy2Fe2Si2C.