EN
ESR measurements for Gd(Al_{1 -x}Ge_{x}) and Gd(Al_{1-x}Sb_{x}) pseudobinary systems with x ≤ 0.15 are presented. In all investigated compounds a marked change in thermal broadening of the line width was observed in temperature lower than 300 K. Using obtained results the bottleneck parameter was calculated as a function of concentration x.