Single crystals of tetramethylammonium tetrahalogenometallate (II) solid solution single crystals were grown and studied mostly by differential scanning calorimetry. Analogies between the temperature-pressure phase diagram of pure hydrogenated or deuterated tetramethylammoniuni chlorides and the solid-solution concentration phase diagrams are shown. The progressive substitution seems equivalent to a change of the pressure, it is understood as a distortion of the metal-halide tetrahedron and a change of interactions with the first, second and third neighbours.
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Perret et al. (1987) studied this question.