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Norio Kaneko Hiroaki Takahashi Keniti Higasi 《Journal of Physics and Chemistry of Solids》1977,38(8):849-853
The polarized Raman spectra below 300 cm?1 and the far infrared spectra from 400 to 30 cm?1 of triglycine selenate were measured at various low temperatures. It was found that the Raman doublet at 44 and 38 cm-1 observed in the paraelectric phase (space group C22h) was reduced to a singlet at 38 cm?1 in the ferroelectric phase (space group C22). This spectral anomaly in the paraelectric phase appears to be due to the splitting of the translational mode of glycine I along the crystallographic b axis, the splitting being caused by the tunneling of glycine I across the barrier between the two potential minima which are located symmetrically on either side of the crystallographic ac plane (i.e. at and . New Raman bands which appear below the Curie temperature are also discussed. 相似文献
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