The kinetics of the local compositional changes at the ferroelectric–antiferroelectric interphase boundaries in lead–lanthanum titanate–zirconate solid solutions

Abstract

The results of the first investigations of the process of local decomposition of lead-lanthanum zirconate-titanate solid solution in the vicinity of the interphase boundaries separating domains of coexisting ferroelectric and antiferroelectric phases are presented. The solid solution with the composition: 6 at% of La, 73 at% of Zr, and 27 at% of Ti is considered. The kinetics of the local decomposition of this solid solution in the process of aging of samples quenched down to room temperature from the paraelectric phase is studied. The mechanisms that define the kinetics of the process of establishment of the equilibrium state of coexisting domains of ferroelectric and antiferroelectric phases are discussed.

Effects of aging and annealing on the polar and antiferrodistortive components of the antiferroelectric transition inPbZr1−xTixO3

“…8,31 Such cation exchanges require the overcoming of barriers of several eV, and therefore are practically impossible at room temperature in a homogeneous material, but the situation may be different in the highly out-ofequilibrium process of nucleation of AFE phase from the FE one. Yet, it is doubtful that such chemical inhomogeneities can be erased by simple thermal activation during short annealings at 900 K, as in the present measurements; in fact, in the paraelectric phase there cannot be strong fields that cause out-of-equilibrium cation diffusion, and the cations should diffuse at the much higher temperatures where sintering occurs.…”

“…5,6 The slow kinetics of AFE/FE transitions has been the object of experimental and theoretical/phenomenological modeling, including a series of articles by Ishchuk and coworkers,7 who propose that short range cation migration is involved, and is made possible at room temperature by the large stress at the AFE/FE interfaces. 8 The physics of the AFE/FE transition can be particularly rich, and these authors even suggest that the relaxor transition can be explained in terms of coexisting FE and AFE phases. 9 An additional phenomenon often related to the AFE transitions is the existence of incommensurate structural modulations.…”

Peculiarities of Ferro-Antiferroelectric Phase Transitions 9. Can the Substances with Coexisting Ferroelectric and Antiferroelectric Phases Mimic the Dipole-Glass Behavior?

“…A small number of experiments on establishment of dependency τ (t) has been done up to now. We will use the results of investigation of the long-time relaxation [8,9]. The process of formation of segregates along the IDWs takes place during more than 30 hours.…”

Effects caused by antiferroelectric nanodomains in PZT-based coarse-grained ceramics with compositions from the morphotropic boundary region

“…Such local decomposition of the solid solution in the vicinity of CIPB in the PZT-based solid solutions has been detected and studied in detail. [9][10][11][12] X-ray and neutron diffraction investigations of the crystal structure of PZT solid solutions from the MPB region of compositions represent the larger group of published studies. These studies are based on the analysis of the profiles of lines of the diffraction pattern due to the elastic scattering of incident radiation.…”

“…There were no discontinuities of crystal plains (we have seen it using TEM) and the boundaries had a coherent character without dislocations and the concentration of the elastic stress. A high degree of the homogeneity of samples has allowed us to study the kinetics of development of segregates in the vicinity of CIPBs 10,11,16 along with the physical effects caused by these CIPBs.…”