Abstract
Abstract 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 b = 1 4 and 3 4 ) . New Raman bands which appear below the Curie temperature are also discussed.
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