Abstract
Abstract NH4NO3–KNO3 mixed crystals, (NH4)xK1−xNO3 (x=0.88, 0.75, and 0.61), are prepared by evaporation of aqueous solutions of ammonium nitrate and potassium nitrate. Polarized Raman spectra of single crystals of mixed crystals are observed at room temperature and are interpreted based on the NH4NO3(III) type D2h16 structure. Raman spectra of powdered samples are examined at various temperatures and it is shown that the NH4NO3-(IV) type phase which is a room-temperature phase of NH4NO3 is not realized in the mixed crystals. In (NH4)0.88-K0.12NO3, NH4NO3(III) type is converted to NH4NO3(V) type around −120 °C. In the spectra of high-temperature phase of mixed crystals, only one broad band in the region 100 cm−1 −120 cm−1 is observed, which corresponds to KNO3(I) or KNO3(III) type structure.
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