High dielectric constant and frozen macroscopic polarization in dense nanocrystalline<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Ba</mml:mi><mml:mi mathvariant="normal">Ti</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>ceramics

Buscaglia, María Teresa; Viviani, Massimo; Buscaglia, Vincenzo; Mitoşeriu, Liliana; Testino, Andrea; Nanni, Paolo; Zhao, Zhe; Nygren, Mats; Harnagea, Cătălin; Piazza, Daniele; Galassi, Carmen

doi:10.1103/physrevb.73.064114

Cited by 290 publications

(159 citation statements)

References 70 publications

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“…On the other hand, for BTO film with the finest grain size of 14 nm (annealed at 500°C), it still exhibits some hysteresis characteristics with P r ~ 0.08 µC/cm 2 , although it is not obvious and shows almost linear dependence of P(E). This corresponds well with the recently reported experimental results that the ferroelectricity does exist in nanocrystalline BTO ceramics with ultra fine grain size of 30 nm [48], 22 nm [49], and even 8 nm [50]. However, the significantly www.intechopen.com reduced P r is indicative of a strong suppression of macroscopic ferroelectric character in the 14 nm BTO film, which may arises from either the frozen domain structure under an external field by grain boundary effects, such as the clamping of the domain walls and the hindrance of polarization switching, or the depolarization field originated by the low permittivity nonferroelectric grain boundaries [49].…”

Section: Grain Size Effectsupporting

confidence: 78%

Epitaxial Integration of Ferroelectric BaTiO3 with Semiconductor Si: From a Structure- Property Correlation Point of View

Qiao¹,

Bi²

2011

Ferroelectrics - Material Aspects

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Section: Grain Size Effectsupporting

confidence: 78%

Epitaxial Integration of Ferroelectric BaTiO3 with Semiconductor Si: From a Structure- Property Correlation Point of View

Qiao¹,

Bi²

2011

Ferroelectrics - Material Aspects

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“…Frey et al [15] and Buscaglia et al [16] showed that the distinct local property of the grain boundaries plays an important role in the size dependence. Frey and Payne [4] and Huan et al [5] examined the variation in the density of non-180° domain wall upon the reduction of grain size and correlated it to the intensified elastic constraint that could affect the overall properties [6,17].…”

Section: Introductionmentioning

confidence: 99%

Intrinsic versus extrinsic effects of the grain boundary on the properties of ferroelectric nanoceramics

Kang

Wang

et al. 2017

Phys. Rev. B

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As the grain size decreases to the nanometer range, the characteristics of the ferroelectric nanoceramic can be ultimately determined by the competition between two effects: the intrinsic effect that is associated with the local properties of the grain boundary and the extrinsic effect that arises from the dynamics of domain structure which is highly influenced by the depolarization field caused by the grain boundary. In this work we investigate such a competition with a phase-field simulation based on the time-dependent Ginzburg-Landau (TDGL) kinetic equation.The study is performed on poled/unpoled nanoceramics under high-and low-amplitude bipolar alternating electric field with selected grain size and loading frequency. Our calculations for poled BaTiO 3 at 100 Hz show that, for the grain size from 170 to 50 nm, its properties are dominated by the extrinsic effect, and from 50 to 10 nm, they are dominated by the intrinsic one. As the grain size decreases, the dielectric and piezoelectric constants at the remnant state continuously rise in the extrinsic-dominated region and then drop sharply in the intrinsic-dominated region. Our frequency calculations from 10 to 2,500 Hz at the grain size of 100 nm indicate that the high-frequency behavior is very similar to that of the small grain-size, intrinsic-dominated one, whereas the low-frequency behavior is closely related to that of the large grain-size, extrinsic-dominated part, with the demarcation line occurring around 400 Hz. For the un-poled ceramics under small signal loading, the intrinsic effect is dominant over the entire range of grain size and frequency.

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“…12 Highly densified ferroelectric ceramics with grain size lower than 100 nm are now currently obtained using fast sintering techniques. [12][13][14][15][16] However, producing ceramics made of sub-50 nm grains while minimizing extrinsic contributions to the dielectric properties remains a difficult task. Both the quality of the initial nanopowders (crystallinity, stoichiometry, hydroxyl groups) and the control of charged defects (oxygen vacancies, free electrons) in the final ceramics are mandatory to improve dielectric performances.…”

Section: Introductionmentioning

confidence: 99%

Innovative architectures in ferroelectric multi-materials: Chemistry, interfaces and strain

et al. 2015

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Breakthroughs can be expected in multi-component ceramics by adjusting the phase assembly and the micro-nanostructure. Controlling the architecture of multi-materials at different scales is still challenging and provides a great opportunity to broaden the range of functionalities in the field of ferroelectric-based ceramics. We used the potentialities of Spark Plasma Sintering (SPS) to control a number of key parameters regarding the properties: anisotropy, interfaces, grain size and strain effects. The flexibility of the wet and supercritical chemistry routes associated with the versatility of SPS allowed designing new ferroelectric composite ceramics at different scales. These approaches are illustrated through various examples based on our work on ferroelectric/dielectric composites.

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High dielectric constant and frozen macroscopic polarization in dense nanocrystallineBaTiO3ceramics

Cited by 290 publications

References 70 publications

Epitaxial Integration of Ferroelectric BaTiO3 with Semiconductor Si: From a Structure- Property Correlation Point of View

Epitaxial Integration of Ferroelectric BaTiO3 with Semiconductor Si: From a Structure- Property Correlation Point of View

Intrinsic versus extrinsic effects of the grain boundary on the properties of ferroelectric nanoceramics

Innovative architectures in ferroelectric multi-materials: Chemistry, interfaces and strain

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