Physical Effects in the Vicinity of the Ferroelectric–Antiferroelectric Interface

Ishchuk, V. M.; Sobolev, V. L.

doi:10.1166/jsim.2015.1075

Cited by 4 publications

(7 citation statements)

References 81 publications

(162 reference statements)

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“…In the simplest case of the equal stability of these phases (here the equality of the free energies of these phases is meant), in the frames of the phenomenological Landau-Ginsburg theory the energy describing this interaction can be represented in the following form 13,14,16 :…”

Section: Diffuseness Of the Phase Transition From Paraelectric To Ordmentioning

confidence: 99%

“…Due to this, the interaction is essential in the vicinity of the boundaries and its influence decreases when the distance from the boundary increases. This interaction gives the energy gain for the zone in the vicinity of the boundary (this zone is determined by the region where coefficients C 1 and D 2 have nonzero values) 13,16 :…”

Section: Diffuseness Of the Phase Transition From Paraelectric To Ordmentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

“…[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.…”

Section: Introductionmentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

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

2017

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Presented results demonstrate importance of taking into account such a phenomenon as the solid solution decomposition at the boundaries separating coexisting phases in lead zirconate-titanate-based solid solutions with compositions belonging to the morphotropic boundary region of the \temperature-composition" phase diagram. It is shown that in the local decomposition of solid solutions in the vicinity of the boundaries separating the tetragonal and rhombohedral phases in lead zirconate-titanate-based solid solutions lead to the changes of the solid solution's chemical composition and to the formation of segregates. It is also shown that the proper thermoelectric treatment of samples containing these segregates can give substantially higher values of piezoelectric parameters in the lead zirconate-titanate-based compounds.

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Section: Diffuseness Of the Phase Transition From Paraelectric To Ordmentioning

confidence: 99%

Section: Diffuseness Of the Phase Transition From Paraelectric To Ordmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2017

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Elastic aging from coexistence and transformations of ferroelectric and antiferroelectric states in PZT

Cordero

Craciun

Trequattrini

et al. 2016

Journal of Applied Physics

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Materials undergoing antiferroelectric/ferroelectric (AFE/FE) transitions are studied for possible applications that exploit the large volume, charge and entropy differences between the two states, such as electrocaloric cooling, energy storage, electromechanical actuators. Though certain compositions of PbZr1−xTixO3 (PZT) codoped with La and Sn may withstand millions of electrically induced AFE/FE cycles, in other cases few thermally induced cycles and room temperature aging may cause noticeable changes in the material properties. This is particularly evident in the elastic moduli, which at room temperature can become as much as four times softer. In order to get more insight into the mechanisms involved in such elastic aging and full recovering with mild annealing at 600 − 800 K, the effect of La doping on PbZr0.954Ti0.046O3 is studied with anelastic measurements. Complete suppression of the time dependent phenomena is found after the transformation of the intermediate FE phase into incommensurate AFE by 2% La doping. This is discussed in terms of disappearance of the stress and electric fields at the FE/AFE interfaces, in the light of the thermally activated anelastic relaxation processes that are observed at high temperature, and are due to mobile defects, presumably O vacancies.

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Damage from Coexistence of Ferroelectric and Antiferroelectric Domains and Clustering of O Vacancies in PZT: An Elastic and Raman Study

2019

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It is often suggested that oxygen vacancies (V O ) are involved in fatigue and pinning of domain walls in ferroelectric (FE) materials, but generally without definite evidence or models. Here the progress of damage induced by the coexistence of FE and antiferroelectric (AFE) domains in the absence of electric cycling is probed by monitoring the Young’s modulus, which may undergo more than fourfold softenings without significant changes in the Raman spectra, but may end with the disaggregation of PZT with ∼5% Ti. At these compositions, the FE and AFE phases coexist at room temperature, as also observed with micro-Raman, and hence the observations are interpreted in terms of the aggregation of V O at the interfaces between FE and AFE domains, which are sources of internal electric and stress fields. The V O would coalesce into planar defects whose extension grows with time but can be dissolved by annealing above 600 K, which indeed restores the original stiffness. The observed giant softening is interpreted by assimilating the planar aggregations of V O to flat inclusions with much reduced elastic moduli, due to the missing Zr/Ti−O bonds. A relationship between the coalescence of a fixed concentration of V O into planar defects and softening is then obtained from the existing literature on the effective elastic moduli of materials with inclusions of various shapes.

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Physical Effects in the Vicinity of the Ferroelectric–Antiferroelectric Interface

Cited by 4 publications

References 81 publications

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

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

Elastic aging from coexistence and transformations of ferroelectric and antiferroelectric states in PZT

Damage from Coexistence of Ferroelectric and Antiferroelectric Domains and Clustering of O Vacancies in PZT: An Elastic and Raman Study

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