(Color online) (a) The Brillouin spectra of  c -oriented unpoled PIN-PMN-PT single crystals at a few temperatures in a wide frequency range. (b) The Brillouin spectra of unpoled and poled single crystal measured at 30 °C. The inset of (a) shows the temperature dependence of FWHM of CP which is inversely proportional to the relaxation time τ.
(Color online) The temperature dependencies of (a) the Brillouin frequency shift and (b) the FWHM of the LA mode of the unpoled sample measured on both cooling and heating processes. The dielectric permittivity is shown in (a) for comparison. The inset of (b) is the characteristic relaxation frequency as explained in the text in the Arrhenius plot.
(Color online) The temperature dependence of the dielectric permittivity and the Brillouin shift of the poled PIN-PMN-PT single crystal.
(Color online) The temperature dependences of (a) the Brillouin frequency shift and (b) the FWHM of the LA and TA modes of both the unpoled and poled samples measured on heating process. The insets (c) and (d) show the extended plot of νB and the mode intensities of the poled sample near the ferroelectric phase transitions, respectively.
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