The magnetostriction of single crystals of PrAl 2 and TbAl 2 has been measured throughout the ordered state. The magnetoelastic constants M 2 y and M 2 epsilon have been determined. Previous work has already established that the point-charge model accounts satisfactorily for the magnetoelastic constants of NdAl 2 . The present results show that this model applies equally well to TbAl 2 and would probably do so for PrAl 2 if better values for the cubic crystal field parameters could be obtained.
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Abell et al. (1983) studied this question.
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