Abstract
Disordered oxygen octahedral rotations have been observed in the low-temperature rhombohedral ferroelectric state in the Pb(Zr1−xTix)O3 crystalline solution. The development of disordered oxygen octahedral rotations within the ferroelectric state was found to result in the interruption of long-range polar order and the development of fluctuation effects. Dielectric relaxation was observed below ∼160 °C for Pb(Zr0.65Ti0.35)O3. In addition, double-looplike characteristics were observed in the polarization electric-field (P–E) response in the same temperature range. The results clearly reveal the nature of the coupling between the polarization and oxygen octahedral rotations in a perovskite ferroelectric structure. It was also shown that a small amount of La doping can enhance the degree of ordering of the octahedral tilted state. The enhancement of the ordering was verified by an intensity increase of the 1/2〈111〉 superlattice reflections in the selected area electron-diffraction pattern.
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