The details of the infra‐red spectra over the range 200 to 1000 cm −1 are presented for eight members of the spinel series Mg(Cr x Al 2− x )O 4 and correlated with the development of local distortions of C 3v symmetry. It is shown that the frequency behaviour of two of the prominent absorption bands is described rather well by the equations given by Waldron for the modes labelled v 1 and v 3 . Force constants k 1 and k 0 , corresponding to unit displacements along the tetrahedral cation‐oxygen and octahedral cation‐oxygen bonds, respectively, are derived in a manner which allows for the presence of other interactions.
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Grimes et al. (1971) studied this question.
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