## Abstract

Thermal properties of CoCl_{2}, MnCl_{2} and their mixed crystals are investigated by means of temperature dependent neutron powder diffraction and time-resolved small angle neutron scattering. The coefficients of thermal expansion of these crystals have been determined as a function of temperature. The temperature-induced structural variations can be explained by distortions of CoCl_{6}/MnCl_{6} octahedra and changes in Co/Mn–Cl bond lengths. CoCl_{2} and MnCl_{2} form homogeneous solid solutions in the entire temperature range between the solidus and 50 K. There is no indication of any miscibility gap as predicted from thermodynamic calculations.

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