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이광세,서정아,황윤홰,김형국,이철의,Kusuo Nishiyama 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.2
Raman spectra of polycrystalline squaric acid (H2C4O4) were measured in the frequency shift region of 150 - 4000 cm-1 below and above the antiferroelectric phase transition (Tc = 373 K). No marked changes of internal vibrations of the H2C4O4 molecule in the crystal were observed up to 473 K, indicating that the symmetry of the H2C4O4 in the antiferroelectric phase persisted to the paraelectric phase. Raman spectra of polycrystalline squaric acid (H2C4O4) were measured in the frequency shift region of 150 - 4000 cm-1 below and above the antiferroelectric phase transition (Tc = 373 K). No marked changes of internal vibrations of the H2C4O4 molecule in the crystal were observed up to 473 K, indicating that the symmetry of the H2C4O4 in the antiferroelectric phase persisted to the paraelectric phase.