Abstract
Three phase transitions were observed in single crystals of Cs(DxH1-x)2AsO4. Two of these transitions are predicted from the double minimum potential well theory of hydrogen-bonded ferroelectrics and are associated with the ferro-electric-paraelectric transition (227°K) and the melting or decomposition temperature (467° K) of the crystal. A third transition was observed at 443° K which is destructive. The behavior at this transition was investigated by DTA, TGA and X-ray diffraction techniques. The variation of the ferroelectric transition and optical (SHG) second harmonic generation phase matching temperatures was found to be a linear function of deuteration.
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