The unit cell dimensions, densities and magnetic susceptibilities of the tetragonal PtMn phase with the CuAu I type structure have been studied as a function of composition. With increasing platinum content the a and c axes go respectively through a maximum and minimum close to the equiatomic composition. This behaviour can be attributed to geometrical requirements considering the relative sizes of Pt and Mn atoms. The solid solution is substitutional.
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Brun et al. (1964) studied this question.
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