Abstract
The structures of phases in the Fe-Ge system were studied by means of neutron and X-ray diffraction. The Fe 1 + y Ge phase of the hexagonal B8 2 type has a canted ferrimagnetic structure with magnetic unit cell identical to the chemical one. The Fe atoms in 2( a) sites form one sublattice, Fe I, with parallel spin directions, while those, Fe II, in 2( d) sites form Fe II-Ge-Fe II chains with spin directions canted 28° from the Fe I spin direction and 56° from adjacent Fe II chains. The spin directions lie in the basal plane. Magnetic moments at 25°C were μ I = 1.30 μβ and μ II = 1.10 μβ. No long-range antiferromagnetic structure was found for the phase FeGe with hexagonal B35-type crystal structure according to neutron diffraction patterns down to 80°K. The FeGe 2 phase was found to be antiferromagnetic. The limits of the phase field for Fe 1 + y Ge were established.
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