Abstract
At high temperature, the A 2 BX 4 crystals exhibit P6 3 /mmc structure. With temperature decreasing, a rich diagram of structural phases and phase transitions are observed, including different incommensurate phases. Ordering of the BX 4 tetrahedra orientation in the unit cell drives the transitions, and they can be well described by an Ising model with competing interactions. Raman and infrared spectroscopy, differential scanning calorimetry (DSC) and thermogravimetry (TGA) are used to characterize the phase transitions in Cs 2 HgBr 4 and Rb 2 WO 4 crystals.
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