A new method to determine structural domains

A new method to determine the volume distribution of structural domains is presented. The scattering intensities of fundamental Bragg reflections are analysed. The theory applies to all phase transitions which exhibit structural domains. Thus, there is a subgroup relation between the low- and high-temperature symmetry. The knowledge of both structures and the temperature-dependent order parameters are required. The method is applied to the structural phase transition of the perovskite KMnF3.

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