Crystal structure of the compounds RFe₄Si₂ (R = Dy, Tm)

Chem. Met. Alloys 2 (2009) 211-214

https://doi.org/10.30970/cma2.0116

Oksana BARDIN, Bohdana BELAN, Mykola MANYAKO, Roman GLADYSHEVSKII

The crystal structures of the compounds RFe₄Si₂ (R = Dy, Tm) were determined from X-ray single-crystal (CAD-4T diffractometer, Mo Kα radiation) and powder (HZG-4a diffractometer, Fe Kα radiation) diffraction data. The compounds crystallize with the ZrFe₄Si₂ structure type, space group P4₂/mnm, Pearson symbol tP14; a = 7.1691(8), c = 3.780(1) Å, R_F = 0.0197, R_w = 0.0186 for DyFe₄Si₂ and a = 7.1235(3), c = 3.7847(2) Å, R_B = 0.0777 for TmFe₄Si₂. Both compounds are stoichiometric with an ordered distribution of the atoms.

a	b
c	d

Projection of the unit cell of DyFe₄Si₂ along [0 0 1] (a) and coordination polyhedra of the atoms: [DySi₆Fe₁₂Dy₂] (b), [FeSi₃Fe₆Dy₃] (c), and [SiFe₆Dy₃] (d).

Keywords

Rare-earth metal / Iron / Ternary silicide / Crystal structure