Abstract
Abstract Phases and structural phase transitions of the compounds (CH 3 NH 3 ) 2 MnCl 4 , (C 2 H 5 NH 3 ) 2 MnCl 4 and (C 3 H 7 NH 3 ) 2 MnCl 4 have been studied by means of thermoanalytical methods (DSC) and X-ray single crystal and powder diffraction data in the temperature range of 85–480°K at normal pressure. All phases show perovskite-like layer structures. The high temperature phases (α phase) correspond to the K 2 NiF 4 type and may be regarded as the aristotype of each polymorphic compound. All transitions are reversible. Transition patterns are: Based on the DSC peak-shape analysis and diffraction data a model of a tilting system of the MnCl 6 -octahedra layer is introduced in order to understand essential features of structures of different phases and their transition behavior. Single crystal film data of (C 3 H 7 NH 3 ) 2 MnCl 4 phases reveal some disorder phenomena. The e phase exhibits a superstructure along [010] with a triplication of the shortest axis corresponding to the δ phase. The γ phase of this compound shows strong satellite reflections, due to a transverse distortion wave along the [100] lattice direction.
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