Perspective on emerging views on microscopic origin of relaxor behavior

Pramanick, Abhijit; Nayak, Sisir Kumar

doi:10.1557/s43578-020-00010-7

Cited by 17 publications

(8 citation statements)

References 161 publications

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“…Traditionally, two distributions of weakly polar clusters (PNRs) are defined according to different relaxor states . One is defined as the dissolution of weakly polar clusters in a ferroelectric (polar) matrix, without considering the existence of paraelectric states (Figure a).…”

Section: Resultsmentioning

confidence: 99%

“…Traditionally, two distributions of weakly polar clusters (PNRs) are defined according to different relaxor states. 53 One is defined as the dissolution of weakly polar clusters in a ferroelectric (polar) matrix, without considering the existence of paraelectric states (Figure 6a). This behavior has been observed in relaxors such as PMN-PT, and it is believed that the unique high-density domain walls promote the polarization rotation of PNRs, thereby enhancing piezoelectricity.…”

Section: Methodsmentioning

confidence: 99%

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Ferroelectric-Relaxor Crossover and Energy Storage Properties in Sr₂NaNb₅O₁₅-Based Tungsten Bronze Ceramics

Cao

Yuan

Meng

et al. 2022

ACS Appl. Mater. Interfaces

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Filled and unfilled Sr 2 NaNb 5 O 15 -based tungsten bronze ceramics based on Gd doping were prepared using a traditional solid-state reaction method. Relaxor behaviors of the two different systems were analyzed, and the corresponding energy storage performance was also characterized. With the support of weakly coupled polar nanoregions and a non-polar matrix, an energy storage density of 2.37 J/cm 3 and an efficiency of 94.4% were obtained in the Sr 1.82 Gd 0.12 NaNb 5 O 15 ceramic. A discharge energy density of 2.51 J/cm 3 and a power density of 59.1 MW/cm 3 further proved its prospect for practical applications. In addition, the thermal stability and fatigue resistance of the ceramic were also evaluated. At the same time, under the theoretical framework of a perovskite and tungsten bronze, the contribution of vacancies to the local structure and relaxor behavior was briefly discussed. Because the currently used ceramics do not contain easily reducible metal oxides, this work lays the foundation for the development of multilayer ceramic capacitors that use base metals as internal electrodes.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Ferroelectric-Relaxor Crossover and Energy Storage Properties in Sr₂NaNb₅O₁₅-Based Tungsten Bronze Ceramics

Cao

Yuan

Meng

et al. 2022

ACS Appl. Mater. Interfaces

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“…This hybridization synchronized with B site cations, which possess differential ferroelectric activity, charge, and ionic radius, can give rise to different polar ordering states. − Some examples are long-range polar ordering in the PbTiO 3 (PT) ferroelectric and the antiferroelectric ordering in PbZrO 3 . Relaxor ferroelectrics, such as Pb(Mg 1/3 Nb 2/3 )O 3 (PMN), featuring short-range polar ordering attract considerable interest owing to their unusual dielectric response and superior electromechanical properties. − The most prominent characteristic of relaxor ferroelectrics is the high dielectric permittivity over a wide temperature range with a strong frequency relaxation, which is significantly different compared to normal ferroelectrics.…”

Section: Introductionmentioning

confidence: 99%

Evolving Differentiated Local Polar Displacement and Relaxor Behavior in Pb(Mg_1/3Nb_2/3)O₃–PbTiO₃ Perovskites

Liu

Sun

et al. 2022

Chem. Mater.

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Lead-based relaxor ferroelectrics feature exceptional dielectric and electromechanical properties. The inherent local structural inhomogeneity remains poorly characterized and impedes the understanding of their unique electrical behavior. Herein, the local structure of a technologically important 0.75Pb(Mg 1/3 Nb 2/3 )O 3 −0.25PbTiO 3 relaxor is studied as a function of temperature, by employing neutron total scattering combined with newly advanced reverse Monte Carlo modeling. The statistical analysis of local cationic polar displacement vectors demonstrates that a prevailing order/disorder feature and strong displacive behavior are observed in Pb and Ti, but both weak components are observed in Nb/Mg. This leads to trifurcated polar behavior across the feature temperatures. Importantly, these distinct cationic polar vectors are correlated and present a microscopic picture, where sporadic correlated orthorhombic polar clusters are embedded in a long-range rhombohedral polar matrix at low temperature. Their fraction extends with increasing temperature, presenting strong ferroelectricity with dielectric relaxation macroscopically. Furthermore, the long-range rhombohedral polar ordering is disrupted by temperature, forming free-oriented polar clusters with reducing electric dipole length, gradually losing their macroscopic polarization, and resulting in a diffuse phase transition behavior. Altogether, this offers a fundamental basis in terms of local polar fluctuations in inferring the nature of the unique properties of relaxor ferroelectrics.

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“…9 Therefore, the disrupted period without signatures of ferroelectric switching is lower (0.64 min for BFO–35STO vs. 0.7 min for BFO–42STO), which allows larger Fe/Ti and Bi/Sr displacements from their central positions. Although distinct models are still under debate to correlate the origin and mechanisms involving polar nanoregions, 19 our results indicates that the presence of relaxor phase in BFO– x STO ceramics emerges due to the increased charge disorder. 42 Interestingly, recent in situ poling studies in BFO–40STO with R 3 c cores surrounded by clamped pseudo-cubic shells have not demonstrated significant variations until 10 kV mm −1 .…”

Section: Discussionmentioning

confidence: 73%

Electric-field-induced non-ergodic relaxor to ferroelectric transition in BiFeO₃–xSrTiO₃ ceramics

et al. 2023

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Perspective on emerging views on microscopic origin of relaxor behavior

Cited by 17 publications

References 161 publications

Ferroelectric-Relaxor Crossover and Energy Storage Properties in Sr₂NaNb₅O₁₅-Based Tungsten Bronze Ceramics

Ferroelectric-Relaxor Crossover and Energy Storage Properties in Sr₂NaNb₅O₁₅-Based Tungsten Bronze Ceramics

Evolving Differentiated Local Polar Displacement and Relaxor Behavior in Pb(Mg_1/3Nb_2/3)O₃–PbTiO₃ Perovskites

Electric-field-induced non-ergodic relaxor to ferroelectric transition in BiFeO₃–xSrTiO₃ ceramics

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Perspective on emerging views on microscopic origin of relaxor behavior

Cited by 17 publications

References 161 publications

Ferroelectric-Relaxor Crossover and Energy Storage Properties in Sr2NaNb5O15-Based Tungsten Bronze Ceramics

Ferroelectric-Relaxor Crossover and Energy Storage Properties in Sr2NaNb5O15-Based Tungsten Bronze Ceramics

Evolving Differentiated Local Polar Displacement and Relaxor Behavior in Pb(Mg1/3Nb2/3)O3–PbTiO3 Perovskites

Electric-field-induced non-ergodic relaxor to ferroelectric transition in BiFeO3–xSrTiO3 ceramics

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Ferroelectric-Relaxor Crossover and Energy Storage Properties in Sr₂NaNb₅O₁₅-Based Tungsten Bronze Ceramics

Ferroelectric-Relaxor Crossover and Energy Storage Properties in Sr₂NaNb₅O₁₅-Based Tungsten Bronze Ceramics

Evolving Differentiated Local Polar Displacement and Relaxor Behavior in Pb(Mg_1/3Nb_2/3)O₃–PbTiO₃ Perovskites

Electric-field-induced non-ergodic relaxor to ferroelectric transition in BiFeO₃–xSrTiO₃ ceramics