Heavily carbon-doped In0.53Ga0.47As with hole densities between 5.6 X 10(18
) and 2.1 X 10(20) cm(-3) has been grown by solid source molecular beam epi
taxy on InP. The dependence of carbon tetrabromide (CBr4)-induced lattice m
ismatch upon the atomic carbon concentration has been determined from x-ray
rocking curve measurements. It has been found by secondary ion mass spectr
oscopy that the alloy composition is altered by the preferential etching ef
fect of CBr4. After taking into account this compositional change, the "int
rinsic" lattice contraction solely due to carbon incorporation has been obt
ained, which obeys Vegard's law. (C) 1999 American Vacuum Society. [S0734-2
11X(99)02503-2].