Abstract
Expressions for elastic constants of mixed crystals of GaAs x P 1P 1 − x as a function of composition have been derived on the random element isodisplacement model using the long wave method. Calculations have been made on the assumptions (i) that the second-neighbour As-P interaction is the average of the As-As and P-P interactions, or (ii) the As-P interaction is that obtained from the infrared reflectivity data. The variation of elastic constants with concentration is almost linear in the first case; but in the second case it shows a well-defined maximum. The Debye temperature also shows a non-linear variation with composition in the second case, though the deviation from linearity is less pronounced than with the elastic constants.
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