The expansivities and the thermal degradation of some layer compounds

TLDR: In this article, the thermal expansion coefficients and decomposition products at high temperatures under vacuum have been determined for a number of layer compounds; SnS2, SnSe2, ZrS2 and TiS2; all of which have crystal structures based on that of cadmium iodide.

Abstract: The thermal expansion coefficients and the decomposition products at high temperatures under vacuum have been determined for a number of layer compounds; SnS2, SnSe2, SnSSe, ZrS2, HfS2 and TiS2, all of which have crystal structures based on that of cadmium iodide, and∈-GaSe. In all compounds the expansion perpendicular to the layers (∥c) is much greater than that parallel to the layers (⊥c). This is ascribed to the effect of the weak van der Waal's bonding between layers. Thermal degradation at high temperatures (up to 900° C) under vacuum usually follows a route via the monochalcogenide or the sub-chalcogenide to the oxide.