Abstract
Lattice parameters of hexagonal Cr 5 S 6 have been determined as a function of temperature by X-ray diffraction between 80 K and 400 K. Marked changes in temperature slope for c - and a -axes appear at the noncollinear-to-collinear transition temperature T t =(167±2) K and at the ferrimagnetic Curie temperature T c =(310±5) K. The slope of c -axis changes from negative to positive at T t as the temperature is raised. Observed changes in slope for cell volume at T t and T c agree with those calculated from the Ehrenfest relation. This correspondence is consisted with the second order characteristics predicted theoretically by Dwight et al. Positive amounts of departure from usual thermal expansions for phonons are observed on both axes below T c , which are well explained in terms of exchange striction.
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