For differently prepared and for ion‐bombarded samples the behavior of linewidth, lineshape and saturation has ben studied. A close relation between the temperature dependent part of the linewidth and the hopping conductivity is found. The temperature independent contribution at low temperatures varies considerably with preparation conditions, but only little with spin density. At constant temperature the saturation power increases with rising conductivity of the samples indicating that the spin‐lattice relaxation is strongly enhanced by hopping.