The magnetic properties of the ternary intermetallic RRhGe (R = Dy and Tm)
were investigated by magnetic and neutron diffraction measurements. These c
ompounds crystallize in a TiNiSi-type orthorhombic structure and are antife
rromagnets with the Neel temperature 20 K (R = Dy) and 6.2 K (R = Tm). The
neutron diffraction data reveal that the magnetic order in TmRhGe is collin
ear with the magnetic unit doubled along the b-axis respective to the cryst
al one.