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The dependence of the barrier height Â¿Bn of Au-Ga1Â¿xAlxSb Schottky barriers on x, the mole fraction of Al in the solid, has been measured. The data show that as x increases the values of Â¿Bn also increase. However, the measured barrier heights do not agree with those predicted by the `common anionÂ¿ rule. This result, coupled with other available data, indicates that the Au-Ga1Â¿xAlxSb hole Schottky barrier height (Â¿Bn) is not independent of the Ga/Al cation ratio.