Mapping bias-induced phase stability and random fields in relaxor ferroelectrics

Rodriguez, Brian J.; Jesse, Stephen; Bokov, Alexei A.; Ye, Z. G.; Kalinin, Sergei V.

doi:10.1063/1.3222868

Cited by 26 publications

(27 citation statements)

References 24 publications

(25 reference statements)

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“…24 In addition, static PNRs (not reoriented by thermal motion) have been observed in PMN-PT. 32 The configuration of these PNRs seems to be very stable even after the application of an external electric field. It seems that the occurrence of static PNRs is closely related to the presence of chemically ordered regions (CORs).…”

Section: Resultsmentioning

confidence: 99%

Electrocaloric properties in relaxor ferroelectric (1−x)Pb(Mg1/3Nb2/3)O3–xPbTiO3 system

Peräntie

Tailor

Hagberg

et al. 2013

Journal of Applied Physics

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The electrocaloric effect (ECE) in the Pb(Mg1/3Nb2/3)O3–PbTiO3 (PMN-PT) solid solution system was investigated by means of detailed direct temperature measurements as a function of temperature, composition, and electric field. The (1−x)PMN-xPT ceramics of compositions 0 ≤ x ≤ 0.3 were fabricated by the columbite route. In opposite to conventional ferroelectrics, the maximum of electrocaloric effect was found to shift from the proximity of depolarization/Curie temperature to higher temperatures above a certain composition-dependent electric field strengths. Especially, the compositions with low PT content showed a broadened temperature range of electrocaloric effect. With increasing PbTiO3 concentration, the magnitude of ΔT increased, and the temperature dependence of the maximum ECE response gradually developed towards a more pronounced anomaly typical for conventional ferroelectrics. The arising high temperature electrocaloric effect in the ergodic relaxor phase was attributed to the contribution from polar nanoregions. All the compositions studied showed the highest electrocaloric activity just above the depolarization/Curie temperature close to the possible critical point, as recently predicted and observed for some compositions. The magnitude of the maximum electrocaloric temperature change was in the range of ΔT = 0.77–1.55 °C under an electric field strength of 50 kV/cm.

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Section: Resultsmentioning

confidence: 99%

Electrocaloric properties in relaxor ferroelectric (1−x)Pb(Mg1/3Nb2/3)O3–xPbTiO3 system

Peräntie

Tailor

Hagberg

et al. 2013

Journal of Applied Physics

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“…due to preferential orientation of defects). We observed such a kind of shifts for local loops measured with PFM [24]. Considering the direction and magnitude 2.…”

Section: Introductionmentioning

confidence: 88%

“…Alternatively, truly static PNRs may be responsible for labyrinthine domains. To discriminate between these two possibilities we applied switching spectroscopy PFM [24]. Switching spectroscopy PFM makes it possible to determine the configuration of local quenched electric fields in the material.…”

Section: Introductionmentioning

confidence: 99%

Compositional disorder, polar nanoregions and dipole dynamics in Pb(Mg_1/3Nb_2/3)O₃-based relaxor ferroelectrics

Bokov¹,

Rodriguez

Zhao

et al. 2011

Zeitschrift für Kristallographie

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The complex structure of relaxor ferroelectrics comprises polar nanoregions (PNRs) which appear upon cooling below the Burns temperature and quenched compositional (chemical) disorder. The relation between the polar nanostructure and compositionally ordered regions (CORs) often observed in relaxors has been the subject of extensive theoretical investigations; however, the experimental data, especially concerning Pb(B′1/ 3B″2/3)O3-type complex perovskite relaxors, are rather limited. In this paper, we analyse and discuss the results of our recent investigations of the morphology of CORs and the dynamics of PNRs in Pb(Mg1/ 3Nb2/3)O3 based solid solutions in which the degree of compositional disorder was varied by means of changing the composition and/or by means of high-temperature annealing. The samples were characterised using X-ray diffraction, transmission electron microscopy, piezoresponse force microscopy, Brillouin light scattering, dielectric spectroscopy, as well as by measuring pyroelectric effect and ferroelectric hysteresis loops. No influence of the size of CORs on the PNRs relaxation in the ergodic relaxor phase is found. Instead, the CORs size influences significantly the diffuseness of the transition from the field-induced ferroelectric phase to the ergodic relaxor state. The results are interpreted in the framework of a model suggesting the coexistence of static and dynamic PNRs in the ergodic relaxor phase. Relaxor ferroelectrics / Compositional disorder / Lead magnesium niobate / Dielectric relaxation / Domain structure Abstract. The complex structure of relaxor ferroelectrics comprises polar nanoregions (PNRs) which appear upon cooling below the Burns temperature and quenched compositional (chemical) disorder. The relation between the polar nanostructure and compositionally ordered regions (CORs) often observed in relaxors has been the subject of extensive theoretical investigations; however, the experimental data, especially concerning Pb(B 0 1=3 B 00 2=3 )O 3 -type complex perovskite relaxors, are rather limited. In this paper, we analyse and discuss the results of our recent investigations of the morphology of CORs and the dynamics of PNRs in Pb(Mg 1/3 Nb 2/3 )O 3 -based solid solutions in which the degree of compositional disorder was varied by means of changing the composition and/or by means of high-temperature annealing. The samples were characterised using X-ray diffraction, transmission electron microscopy, piezoresponse force microscopy, Brillouin light scattering, dielectric spectroscopy, as well as by measuring pyroelectric effect and ferroelectric hysteresis loops. No influence of the size of CORs on the PNRs relaxation in the ergodic relaxor phase is found. Instead, the CORs size influences significantly the diffuseness of the transition from the field-induced ferroelectric phase to the ergodic relaxor state. The results are interpreted in the framework of a model suggesting the coexistence of static and dynamic PNRs in the ergodic relaxor phase.

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“…Therefore, labyrinthine domains are in fact frozen spatial fluctuations of polarization caused by the density fluctuations of static PNRs having dipole moment directions up or down. Recent switching spectroscopy PFM experiments 35 showed that static PNRs cannot be switched by an electric field of ϳ10 V ͑i.e., by the bias used in our present work͒. On the other hand, the dynamic PNRs give rise to the observed relaxation.…”

Section: Discussionmentioning

confidence: 99%

Direct evidence of mesoscopic dynamic heterogeneities at the surfaces of ergodic ferroelectric relaxors

et al. 2010

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Spatialvariability of polarization relaxation kinetics in the relaxor ferroelectric 0.9Pb͑Mg 1/3 Nb 2/3 ͒O 3 -0.1PbTiO 3 is studied using time-resolved piezoresponse force microscopy at room temperature. Both the statistical principal component and correlation function analysis and the stretched exponent fits of relaxation curves illustrate the presence of mesoscopic "fast" and "slow" 100-200 nm regions. The spatial distribution of activation energies is reconstructed using a neural-network-based inversion of the relaxation data. The results directly prove the presence of mesoscopic heterogeneities associated with static and dynamic components of the order parameter on the surfaces of ferroelectric relaxors in the ergodic phase.

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Mapping bias-induced phase stability and random fields in relaxor ferroelectrics

Cited by 26 publications

References 24 publications

Electrocaloric properties in relaxor ferroelectric (1−x)Pb(Mg1/3Nb2/3)O3–xPbTiO3 system

Electrocaloric properties in relaxor ferroelectric (1−x)Pb(Mg1/3Nb2/3)O3–xPbTiO3 system

Compositional disorder, polar nanoregions and dipole dynamics in Pb(Mg_1/3Nb_2/3)O₃-based relaxor ferroelectrics

Direct evidence of mesoscopic dynamic heterogeneities at the surfaces of ergodic ferroelectric relaxors

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Mapping bias-induced phase stability and random fields in relaxor ferroelectrics

Cited by 26 publications

References 24 publications

Electrocaloric properties in relaxor ferroelectric (1−x)Pb(Mg1/3Nb2/3)O3–xPbTiO3 system

Electrocaloric properties in relaxor ferroelectric (1−x)Pb(Mg1/3Nb2/3)O3–xPbTiO3 system

Compositional disorder, polar nanoregions and dipole dynamics in Pb(Mg1/3Nb2/3)O3-based relaxor ferroelectrics

Direct evidence of mesoscopic dynamic heterogeneities at the surfaces of ergodic ferroelectric relaxors

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Compositional disorder, polar nanoregions and dipole dynamics in Pb(Mg_1/3Nb_2/3)O₃-based relaxor ferroelectrics