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Zeitschrift für Physikalische Chemie

International journal of research in physical chemistry and chemical physics

Ed. by Rademann, Klaus

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Phase Behaviour of CoCl2-MnCl2 Mixed Crystals

Jav Davaasambuu1 / Friedrich Güthoff2 / Markus Hoelzel3 / Anatoliy Senyshyn4 / Aurel Radulescu5 / Götz Eckold*

1 University of Göttingen, Institute of Physical Chemistry, Göttingen, Deutschland

2 University of Göttingen, Institute of Physical Chemistry, Göttingen, Deutschland

3 TU Darmstadt, Institute for Materials Science, Darmstadt, Deutschland

4 TU Darmstadt, Deparment of Materials and Earth Sciences, Darmstadt, Deutschland

5 Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science, Deutschland

* Correspondence address: University of Göttingen, Institute of Physical Chemistry, Göttingen, Deutschland,

Citation Information: Zeitschrift für Physikalische Chemie. Volume 225, Issue 4, Pages 413–419, ISSN (Online) 2196-7156, ISSN (Print) 0942-9352, DOI: https://doi.org/10.1524/zpch.2011.0115, April 2011

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Thermal properties of CoCl2, MnCl2 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 CoCl6/MnCl6 octahedra and changes in Co/Mn–Cl bond lengths. CoCl2 and MnCl2 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.

Keywords: Mixed Crystal; Demixing; Phase Diagram; Neutron Diffraction; Neutron Small Angle Scattering

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