Abstract
ABSTRACTRaman light scattering studies of lattice dynamics of single crystals of relaxor ferroelectric PbNi1/3Nb2/3O3 (PNN) in the temperature range 586–96 K are presented. The measurements revealed the evolution of polarized spectra from the well-known spectra typical of cubic relaxor ferroelectrics in paraphase to more complex ones at low temperatures. During the temperature evolution new lines appeared in the Raman scattering spectra. As shown by the group-theory analysis of the experimental spectra, a cubic phase with the space group (Fm3) can exist at room temperature. The PNN Raman spectra in the low- temperature phase are described within the framework of the space group (P31m), which agrees with the results of X-ray diffraction analysis [K. Kusumoto, T. Sekiya Ferroelectrics, 240, 327 (2000)].
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