The solid-solution hardening of In1-xGaxSb was investigated by means of Vic
kers indentation microhardness measurements. It shows two hardness peaks an
d deviates considerably, on that account, from II-VI cation solid solutions
which were investigated previously, as well as from solid solutions with p
referentially either metallic or ionic bonds known from the literature. Veg
ard's rule, as a linear lattice parameter-composition relation, is valid fo
r In1-xGaxSb. (C) 1998 Kluwer Academic Publishers.