X-ray diffraction, neutron scattering and Mossbauer experiments indica
te that in the (Fe1-xCox)(3.34)Ge-2 ferromagnetic system there are two
metal sites but three different surroundings. Co does not contribute
any magnetic moment. Two competing contributions to the magnetic aniso
tropy for Fe in the 2a and 2d sites are required to explain the compos
ition anisotropy behaviour.