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- W2022281700 abstract "The high frequency internal valence vibrations of the P 2 Se 6 molecular units in Sn 2 P 2 Se 6 are studied by Raman and infrared hard mode spectroscopy. These internal modes reflect the structural changes on a local bond length scale, related to the phase transition sequence paraelectric–incommensurate–ferroelectric. Clear frequency and intensity changes are observed in relationship to the phase transitions, in quantitative agreement with mode coupling theory and symmetry selection rules. The relationship to the structural changes is discussed. Additional Raman activity is observed in the incommensurate phase related to phonon folding processes, and in the ferroelectric phase because of deviations from a centro-symmetric structure." @default.
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- W2022281700 date "1999-05-01" @default.
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- W2022281700 title "Raman and infrared hard mode spectroscopy of the internal vibrations in Sn2P2Se6" @default.
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- W2022281700 doi "https://doi.org/10.1016/s0022-3697(98)00319-9" @default.
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