Polar nanodomains and relaxor behaviour in (1−x)Pb(Mg1/3Nb2/3)O3–xPbTiO3 crystals with x=0.3–0.5

Bokov, Alexei A.; Luo, Haosu; Ye, Z.-G.

doi:10.1016/j.mseb.2005.02.015

Cited by 49 publications

(23 citation statements)

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“…35,[37][38][39][40] The temperature of the maximum ECE responsivity was observed to lie just above T d (¼ T C ) (extrapolated from Figure 4) which is reflected in their similar concentration dependence ( Figure 5). When the ferroelectric nature of PMN-PT is strengthened with increasing x, it is expected that T C is approaching T m (T C ¼ T m for ordinary ferroelectrics), 30,41 as shown in Figure 5. The temperature of maximum electrocaloric effect (shown for E ¼ 50 kV/cm in Figure 5) also shows a linear behavior with increasing x in this composition range.…”

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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“…As the solid solutions of a prototypic relaxor [32] Pb (Mg 1/3 Nb 2/3 )O 3 [PMN] or Pb(Zn 1/3 Nb 2/3 )O 3 [PZN] with ferroelectric PbTiO 3 [PT], they show a gradual progression from relaxor to ferroelectric behavior with increasing PT content across the phase diagram [22,[33][34][35][36][37][38]. At high PT contents, the crystals show a sharp phase transition with a dielectric peak like that observed in lead titanate itself and other simpler perovskites [39].…”

Section: Complex Relaxor-ferroelectric Solid Solutionsmentioning

confidence: 99%

Picturing the elephant: Giant piezoelectric activity and the monoclinic phases of relaxor-ferroelectric single crystals

Davis

2007

J Electroceram

124

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Understanding the relationship between the structure and "giant" piezoelectric properties of relaxor ferroelectric solid solutions (1-x)Pb(Mg 1/3 Nb 2/3 )O 3 -xPbTiO 3 [PMNxPT] and (1-x)Pb(Zn 1/3 Nb 2/3 )O 3 -xPbTiO 3 [PZN-xPT] is an extremely difficult task. In this article, three main paradigms are reviewed. In the first, the monoclinic phases present at the morphotropic phase boundary (MPB) are responsible for the giant piezoelectric response in that they allow, or at least facilitate, polarization rotation. In the second, a strong polarization rotation effect is explained by the large piezoelectric shear coefficients of zero-field rhombohedral and orthorhombic phases due to the near degeneracy at the MPB and the intrinsic softness of the relaxor state; zero-field monoclinic symmetries are explained by residually distorted rhombohedral and orthorhombic phases in the presence of internal stresses and/or residual bias fields. In the third, the monoclinic "phases" are composed of very finely twinned rhombohedral or tetragonal domains. In this "adaptive phase" model, based on that for ferroelastic martensites, the large electric-field induced strains are extrinsic in nature and result from the progressive switching of the component "nano-twins"; the ease of polarization rotation is explained by a high domain wall mobility. These paradigms remain to be mutually reconciled. The article includes a thorough review of the history of PMNxPT and PZN-xPT single crystals and, particularly, the most important work done over the last decade.

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“…One particular feature of this crystal is that the ferroelectric phase appears spontaneously upon cooling (i.e. without poling electric field) through sharp phase transition at T C ¼ T m ¼ 521 K [33].…”

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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Polar nanodomains and relaxor behaviour in (1−x)Pb(Mg1/3Nb2/3)O3–xPbTiO3 crystals with x=0.3–0.5

Cited by 49 publications

References 9 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

Picturing the elephant: Giant piezoelectric activity and the monoclinic phases of relaxor-ferroelectric single crystals

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

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Polar nanodomains and relaxor behaviour in (1−x)Pb(Mg1/3Nb2/3)O3–xPbTiO3 crystals with x=0.3–0.5

Cited by 49 publications

References 9 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

Picturing the elephant: Giant piezoelectric activity and the monoclinic phases of relaxor-ferroelectric single crystals

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

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