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 MT6X6-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 MFe6Ge6-xGax.
Keywords
Crystal chemistry / Crystal structure / Host
structure / Intermetallics