The electron behavior in incommensurate phase in Sn₂P₂Se₆ has been considered as the motion in the Mathieu potential. A simple model of effective potential change under a transition incommensurate – domain-like structure ...

In the work it was shown that the In₄Se₃ crystal is similar by its dynamical properties to the InSe modulated crystal. The transformation of the D⁴₆h symmetry group of β-InSe crystal to D⁹₂h group of the In₄Se₃ structure and ...