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Raman Scattering Study of Antiferroelectric Phase Transition in Cu(HCOO)2-4H2O
Takuya Mizushima,Akira Sakai,Chikako Moriyoshi,Kazuyuki Itoh,Takeru Omura 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
Micro-Raman scattering spectra of copper formate tetrahydrate, Cu(HCOO)24H2O, were observed above and below the antiferroelectric phase transition temperature with special attention to internal modes of HCOO and H2O molecules. In the antiferroelectric phase, the symmetric stretching vibration in HCOO at 1375 cm1 splits into two modes and the degree of splitting increases with decreasing temperature. The splitting is caused by doubling of the unit cell, rather than inequivalence of the molecular site due to the reduction in symmetry. Two Ag spectra observed in b(aa)b and a(cc)a geometries show the different temperature dependence in the frequency regions of H2O symmetric stretching and C-H symmetric stretching vibrations. The dierence is discussed in terms of the two-dimensional arrangement of H2O layers in the crystal.