Abstract
Raman experiments were performed on Rb2WO4 crystals, betweenroom temperature and 850 K, including the high-temperatureincommensurate phase. The experimental results observed in theincommensurate (TI = 746 K) and the lock-in (TC = 660 K) phasetransitions can be explained by an order-disorder apex model, wherethe gradual up/down ordering of the WO42- apexes isresponsible for the structural changes. The as-grown sampleexhibits a monoclinic-orthorhombic phase transition that issuppressed by heat treatment of the sample, and this result isconfirmed by differential scanning calorimetry measurements.
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