Structures and magnetic properties of RMxcompounds (R = rare earth, M = Ge or Si, 1.5 ≤x≤ 2) as observed by neutron diffraction

Abstract
Rare earth germanides and silicides of the type RMx (M = Ge or Si) with x values close to 2 occur in four different structure types: the hexagonal AlB2 type, the tetragonal α-ThSi2 type, the orthorhombic α-GdSi2 type and the orthorhombic TbGe2 type. A review is given of the occurrence of these structure types in the various R–M systems as observed by neutron diffraction. The occurrence of Si or Ge vacancies in these structures is emphasized and discussed in relation to the magnetic structures observed for these materials.

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