Low Temperature Phase Transition in Sr(0.66)Ba(0.34)Nb2O6 single Crystal Fibers
J. L. B. Faria, C. W. A. Paschoal, P. T. C. Freire, A. P. Ayala, F. E. A. Melo, J. Mendes Filho, I. A. Santos, J. A. Eiras
Abstract
The structural changes in Sr(0.66)Ba(0.34)Nb2O6 single crystal fibers when the temperature decreases from 295 to 10 K is investigated by dielectric constant measurements and Raman spectroscopy. The anomaly observed in the plot of e is associated to the variation in the intensity and frequency of some Raman modes. We observe that the intensity of some low energy modes has a very singular behavior for the y(xz)y scattering geometry. In the high energy region (> 850 cm-1), a band at ~ 880 cm-1 disappears when the temperature is cooled down to 10K for the y(xz)y geometry and shifts to higher energy values for the y(zz)y geometry.
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