Raman and IR studies of KAl(MoO 4 ) 2 , RbAl(MoO 4 ) 2 and CsAl(MoO 4 ) 2 are reported. The assignments of modes are given on the basis of lattice dynamics calculations. The temperature dependence of the KAl(MoO 4 ) 2 vibrational modes shows that this compound exhibits a second-order phase transition around 90 K from the to most probably a monoclinic and ferroelastic phase.
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Mączka et al. (2004) studied this question.
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