Experimental data of mercury vacancy equilibria in Hg1-xCdxTe for the
compositions x=0.2 and x=0.3 are presented. In addition to common Hall
-effect measurements, the composition x=0.2 is also studied by the pos
itron annihilation technique. The results obtained are in good agreeme
nt with data published in the early eighties. A systematic discussion
of the change of vacancy equilibria as well as conduction type for the
composition interval x=0.2 to x=0.4 is given. (C) 1996 American Insti
tute of Physics.