Abstract
Raman scattering spectra of internal modes hetve been studied in antiferroelectric NH 4 H 2 AsO 4 at several temperatures near the transition temperature T N . The evidence of the C 1 local site symmetry of H 2 AsO 4 - in the paraelectric phase has not been obtained even just above T N . The integrated intensity of the ν 2 mode giving the justification of the C 1 symmetry in the antiferroelectric phase increases with decreasing temperature below T N . In addition, the linewidth of the ν 1 internal mode increases with increasing temperature. From the latter two results, the relaxation of the rigid ice constraint is proposed in the discussion of the models of the phase transition in hydrogen bonded antiferroelectrics.
Published Version
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