LOW-FREQUENCY DIELECTRIC-DISPERSION AND RAMAN-SPECTROSCOPY OF AMORPHOUS LINBO3

Amorphous LiNbO3 was prepared using twin-roller melt quenching method, and the low-frequency dielectric dispersion and Raman spectroscopy of amorphous LiNbO3 was examined. A hopping model was introduced to expl ain this low-frequency (down to the 10(-4) Hz) dielectric behavior. Wh en the heat-treating temperature of the sample was higher than the gla ss transition temperature, it was revealed that the sample changed it' s configurational coordinate to reduce the free energy of the sample b y observing the dielectric behavior at low-frequencies. Raman spectros copy has been employed for the heat-treated samples to study the struc tural changes from amorphous to the crystalline phases.