Polarized Raman spectra of diglycine nitrate single crystal in the lattice-vibration region

Abstract

Abstract Polarized Raman spectra (300−10 cm −1 ) of a diglycine nitrate (DGN) single crystal were measured in the paraelectric (at 300 and 210 K) and ferroelectric (at 150 and 26 K) phases. The Raman spectra of the paraelectric phase are very simple and exhibit broadening of the Rayleigh line, especially in the ( a * a *) spectra. The Raman spectra of the ferroelectric phase were found to exhibit many more bands while the broadening of the Rayleigh line disappears. The origin of this phenomenon is discussed.