Polycrystalline samples of Ce2Co1-xAuxSi3 for x equal to 0.4, 0.6, 0.8 and
1.0 have been studied by neutron diffraction. All compounds exhibit the hex
agonal crystal structure derived from the AlB2-type. For x = 0.4 the Ce mag
netic moments equal to 0.6(l) PB form a simple antiferromagnetic structure
and are parallel to the b-axis. In Ce2Co0.2Au0.8Si3 a short range magnetic
order is observed. For x = 0.6 and 1.0 the Ce-moments do not order up to 1.
5 K.