J. Hlinka

Infrared dielectric response of relaxor ferroelectrics

In the article we discuss the dielectric response of relaxor-type complex perovskites in the phonon-frequency region on the basis of a rich collection of experimental data accumulated in our laboratory by numerous infrared spectroscopy investigations over the past decade. The effect of the cation occupational disorder and of the nanoscopic inhomogeneous polarisation on the infrared response is considered in the framework of the factor-group symmetry analysis and the effective-medium approach. Polar mode assignment and comparison of the mode parameters of different materials is facilitated by systematic evaluation of mode-plasma frequencies. Whenever possible, the results are presented in form of tables convenient for further analysis or by comparison with results of other techniques, including ab-initio calculations. Infrared properties of other non-perovskite relaxors are briefly mentioned.

Domain walls of ferroelectric BaTiO 3 within the Ginzburg-Landau-Devonshire phenomenological model

Mechanically compatible and electrically neutral domain walls in tetragonal, orthorhombic, and rhombohedral ferroelectric phases of

The piezoelectric response of nanotwinned BaTiO3.

{\text{BaTiO}}_{3}

Anisotropic dielectric function in polar nanoregions of relaxor ferroelectrics

are systematically investigated in the framework of the phenomenological Ginzburg-Landau-Devonshire model with parameters of J. Hlinka and P. Marton, Phys. Rev. B 74, 104104 (2006). Polarization and strain profiles within domain walls are calculated numerically and within an approximation leading to the quasi-one-dimensional analytic solutions applied previously to the ferroelectric walls of the tetragonal phase [W. Cao and L. E. Cross, Phys. Rev. B 44, 5 (1991)]. Domain-wall thicknesses and energy densities are estimated for all mechanically compatible and electrically neutral domain-wall species in the entire temperature range of ferroelectric phases. The model suggests that the lowest-energy walls in the orthorhombic phase of

Multiple Soft-Mode Vibrations of Lead Zirconate

{\text{BaTiO}}_{3}

Stress-induced phase transition in ferroelectric domain walls of BaTiO3.

are the

Ferroelectric nanodomains in epitaxial PbTiO3 films grown on SmScO3 and TbScO3 substrates

90\ifmmode^\circ\else\textdegree\fi{}

Dynamical properties of the normal phase of betaine calcium chloride dihydrate. I. Experimental results

and

Broadband Dielectric Spectroscopy of Ba(Zr,Ti)O3: Dynamics of Relaxors and Diffuse Ferroelectrics

60\ifmmode^\circ\else\textdegree\fi{}

Subterahertz dielectric relaxation in lead-free Ba(Zr,Ti)O3 relaxor ferroelectrics

walls. In the rhombohedral phase, the lowest-energy walls are the