Investigation of two-phase nucleation in paraelectric phase of ferroelectrics with ferroelectric–antiferroelectric–paraelectric triple point

Abstract

Articles you may be interested inElectric field induced metastable ferroelectric phase and its behavior in (Pb, La)(Zr, Sn, Ti)O3 antiferroelectric single crystal near morphotropic phase boundary Appl. Phys. Lett.High temperature x-ray diffraction studies on antiferroelectric and ferroelectric phase transitions in ( Pb 1−x Ba x ) ZrO 3 (x=0.05,0.10)Results of investigation of phenomena preceding the phase transition from paraelectric to dipole-ordered phases in Pb 1Ϫx (Li 1/2 La 1/2 ) x (Zr 1Ϫy Ti y )O 3 solid solutions with compositions close to the ferroelectric-antiferroelectric-paraelectric triple point in the Ti-concentration-temperature phase diagram are presented. X-ray diffraction and piezoelectric resonance methods are used for identification of the two-phase ͑antiferroelectric and ferroelectric͒ nuclei at the temperatures above the curie temperature. The relation between the presence of these two-phase nuclei in paraelectric phase of the compound and the diffuseness of the ordering phase transition is noted. The phenomenon of ion segregation at the interdomain boundary separating regions of ferroelectric and antiferroelectric phases and its role in enabling the observation of the piezoelectric resonance are discussed.

Dielectric properties and phase transitions of (Pb0.87La0.02Ba0.1)(Zr0.6Sn0.4−xTix)O3 ceramics with compositions near AFE/RFE phase boundary

“…7, the AFE-PE transition temperature initially decreases with Ti content x, and then increases when passing into the ferroelectric relaxor regime. This means that Ti 4C ions have the opposite effects on transition temperatures of AFE and FE states [15]. The phenomena could be explained in a term of phase partition for the complex perovskite compounds [16].…”

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.…”

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

“…7 in the case of the PZT-based solid solutions with the Pb 0:90 (Li 0:5 La 0:5 ) 0:010 (Zr 1Àx Ti x )O 3 composition. 15 The interval of titanium concentrations within which the domains of the FE and AFE phases coexist in the bulk of the sample is located near x % 19À20 (the phase diagram of this series of solid solutions is presented in Fig. 4).…”

“…It is difficult to elicit directly such-like segregates with the AFE state in the PZT solid solutions at present. It has been done for the PZT-based solid solutions with compositions from the ferroelectricantiferroelectric morphotropic region of the \composition-temperature" phase diagram 9,11,12,15,16,20 (where the sizes of segregates were of the order of several tens of nanometer). In addition to that, several recently appeared publications pointed out the possibility of existence of the AFE ordering in the PZT solid solutions with compositions from the MPB region (the region between the tetragonal and rhombohedral phases) of the phase diagram.…”

“…[13][14][15][16] The goal of our study has been the search and investigation of such effects in the PZT-based solid solutions with the compositions from the MPB region of the \composition-temperature" phase diagram. In no case, we try to assert the absence of the monoclinic phase in the PZT solid solutions.…”