Structures and crystal chemistry of MT₆X₆ phases, filled derivatives of the CoSn-B35 structure

Chem. Met. Alloys 1 (2008) 24-33

https://doi.org/10.30970/cma1.0009

G. VENTURINI, H. IHOU-MOUKO, C. LEFÈVRE, S. LIDIN, B. MALAMAN, T. MAZET, J. TOBOLA, A. VERNIÈRE

M atoms can be inserted into the host CoSn-type TX structure to give MT₆X₆ structures (M = Li, Mg, Ca, IIIA, IVA, lanthanides, U; T = Cr-Ni, X = Si, Ge, X’ = Ga, In). The crystal structures of known MT₆X₆ compounds are reviewed and sorted into orthorhombic, monoclinic and hexagonal series. The diffraction results for ternary and pseudo-ternary compounds are summarized and discussed on the basis of preponderant M-X, T-X and M-T bonding. The structural evolutions in the pseudo-ternary compounds MT₆X_6-xX’_x as a function of X’ are analyzed, underlining the role of the size and electronic structure of X’.

Evolution of the concentration of ScFe₆Ga₆-slabs in the compounds MFe₆Ge_6-xGa_x.

Keywords

Crystal chemistry / Crystal structure / Host structure / Intermetallics