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• W2077284994 abstract "Transverse optical phonons have been studied in (NH4I)0.3(KI)0.7, (ND4I)0.3(KI)0.7 and (NH4Br)0.3(KBr)0.7 using Fourier-transform infrared techniques. In all materials three phonon modes have been observed in the far-infrared regime and were followed as a function of temperature in detail. While the first low-frequency mode characterizes a sublattice motion of the alkali ions against the halogenides K+ ↔ I− and K+ ↔ Br−, the second mode involves vibrations of the ammonium molecules against the halogenide ions NH4+ ↔ I−, ND4+ ↔ I− and HH4+ ↔ Br−. Despite the fact that the average symmetry of these crystals is cubic, the transitional and orientational disorder locally breaks the cubic symmetry, the infra-red selection rules are relaxed and, hence, a third phonon contribution appears. Deviations of the temperature dependence of the eigenfrequencies, as expected for anharmonic modes, are interpreted in terms of a rotation–translation coupling where the phonon modes interact with the orientational degrees of freedom." @default.
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• W2077284994 date "2001-10-30" @default.
• W2077284994 modified "2023-09-23" @default.
• W2077284994 title "Lattice vibrations in the mixed crystals (NH4I)0.3(KI)0.7, (ND4I)0.3(KI)0.7and (NH4Br)0.3(KBr)0.7" @default.
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• W2077284994 doi "https://doi.org/10.1088/0953-8984/13/45/309" @default.
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