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Micro-Brillouin scattering and dielectric experiments were performed on PLZT-x/65/35 (x = 8.0, 9.0, 9.4, 10.0) relaxor ferroelectric ceramics in thermally depoled state. Local polarization with random orientation associated to polar nanoregions (PNRs) indeed appeared in these ceramics. A low temperature anomaly was observed in the dielectric constant showing clear aging character of PLZT relaxor ceramics. [ABSTRACT FROM AUTHOR]

Crystal structure refinement of CaTiO3 and CaTi0.99Nb0.01O3 ceramics data measured by synchrotron x-ray diffraction technique revealed orthorhombic (Pbnm) perovskite symmetry for both the ceramics. TiO6 octahedra exhibited slight distortions from the ideal cubic perovskite symmetry that was attributed to the size ratios of the two types of cations occupying A- and B-sites. [ABSTRACT FROM AUTHOR]

High-resolution micro-Brillouin scattering experiments have been performed on La-modified (Pb1-xLax)(Zr1-yTiy)O3 (lead zirconate titanate) with x = 0.10, y = 0.35 (PLZT 10/65/35) relaxor ferroelectric ceramic to study the central peaks (CPs)phenomena in the temperature range between -80 and 200°C. Both the intensity and band-width of CP showed broad anomalies in the investigated temperature range. The measured spectra did not show any polarization dependence. The temperature dependence of CPs has been discussed in terms of the thermal evolution of nano-size polar micro regions. [ABSTRACT FROM AUTHOR]