The Experts below are selected from a list of 2493 Experts worldwide ranked by ideXlab platform
E K H Salje - One of the best experts on this subject based on the ideXlab platform.
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piezoelectricity and Electrostriction in ferroelastic materials with polar twin boundaries and domain junctions
Applied Physics Letters, 2019Co-Authors: Xiangdong Ding, E K H SaljeAbstract:Weak piezoelectricity, compared with Electrostriction, occurs in twinned ferroelastic materials even when the uniform bulk material is centro-symmetric. In a simple computer simulation, polarity is exclusively generated by the flexoelectric effect. Simple twinned structures (parallel twin walls) are electrostrictive and show no piezoelectricity. Complex twinned structures break inversion symmetry by the simultaneous appearance of junctions, kinks, needle domains, etc. Such structures show weak piezoelectricity (d ∼ 10−4 pm/V) under periodic boundary conditions together with significant Electrostriction. The macroscopic piezoelectric response is stronger (d ∼ 10−3 pm/V) under free boundary conditions due to the effect of relaxing surfaces.
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macroscopic symmetry breaking and piezoelectricity in relaxor ferroelectric lead magnesium niobate
Applied Physics Letters, 2018Co-Authors: E K H Salje, Oktay AktasAbstract:The piezoelectricity and Electrostriction of a single crystal of the archetypical relaxor, lead magnesium niobate, (PbMg1∕3Nb2∕3O3, PMN), have been investigated by resonant piezoelectric spectroscopy (RPS) and resonant Electrostriction spectroscopy (RES). RPS and RES measurements detect the piezoelectric effect and Electrostriction up to ∼730 K and ∼810 K, respectively, with the former being ∼110 K above the Burns temperature TB. The observation of the piezoelectric effect above TB indicates that PNRs exist at such high temperatures and they lead to a non-zero time averaged polarization under the strain gradients induced by chemically ordered regions with F m 3 ¯ m symmetry. Finally, coupled RES and RPS measurements may be a convenient approach to investigate mesoscopic and macroscopic polarity simultaneously, allowing to correlate the former with the latter.The piezoelectricity and Electrostriction of a single crystal of the archetypical relaxor, lead magnesium niobate, (PbMg1∕3Nb2∕3O3, PMN), have been investigated by resonant piezoelectric spectroscopy (RPS) and resonant Electrostriction spectroscopy (RES). RPS and RES measurements detect the piezoelectric effect and Electrostriction up to ∼730 K and ∼810 K, respectively, with the former being ∼110 K above the Burns temperature TB. The observation of the piezoelectric effect above TB indicates that PNRs exist at such high temperatures and they lead to a non-zero time averaged polarization under the strain gradients induced by chemically ordered regions with F m 3 ¯ m symmetry. Finally, coupled RES and RPS measurements may be a convenient approach to investigate mesoscopic and macroscopic polarity simultaneously, allowing to correlate the former with the latter.
Igor Lubomirsky - One of the best experts on this subject based on the ideXlab platform.
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large nonclassical Electrostriction in y nb stabilized δ bi2o3
Advanced Functional Materials, 2016Co-Authors: Nimrod Yavo, Alaric D. Smith, Ori Yeheskel, Sydney Cohen, Roman Korobko, Ellen Wachtel, Peter R. Slater, Igor LubomirskyAbstract:Classical Electrostriction, describing a second-order electromechanical response of insulating solids, scales with elastic compliance, S, and inversely with dielectric susceptibility, e. This behavior, first noted 20 years ago by Robert Newnham, is shown to apply to a wide range of electrostrictors including polymers, glasses, crystalline linear dielectrics, and relaxor ferroelectrics. Electrostriction in fluorite ceramics of (Y, Nb)-stabilized δ-Bi2O3 is examined with 16%–23% vacant oxygen sites. Given the values of compliance and dielectric susceptibility, the Electrostriction coefficients are orders of magnitude larger than those expected from Newnham's scaling law. In ambient temperature nanoindentation measurements, (Y, Nb)-stabilized δ-Bi2O3 displays primary creep. These findings, which are strikingly similar to those reported for Gd-doped ceria, support the suggestion that ion conducting ceramics with the fluorite structure, a large concentration of anion vacancies and anelastic behavior, may constitute a previously unknown class of electrostrictors.
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Giant Electrostriction in Gd‐Doped Ceria
Advanced Materials, 2012Co-Authors: Roman Korobko, Ellen Wachtel, Anitha Patlolla, Anna Kossoy, Harry L. Tuller, Anatoly I. Frenkel, Igor LubomirskyAbstract:Gd-doped CeO(2) exhibits an anomalously large Electrostriction effect generating stress that can reach 500 MPa. In situ XANES measurements indicate that the stress develops in response to the rearrangement of cerium-oxygen vacancy pairs. This mechanism is fundamentally different from that of materials currently in use and suggests that Gd-doped ceria is a representative of a new family of high-performance electromechanical materials.
Lei Zhu - One of the best experts on this subject based on the ideXlab platform.
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Electrostriction enhanced giant piezoelectricity via relaxor like secondary crystals in extended chain ferroelectric polymers
Matter, 2021Co-Authors: Zhiwen Zhu, Guanchun Rui, Elshad Allahyarov, Thibaut Soulestin, Fabrice Domingues Dos Santos, Philip L Taylor, Lei ZhuAbstract:Summary Piezoelectricity in ferroelectric polymers originates from the electrostrictive effect coupled with a remanent polarization. However, its structural origin remains controversial, and it is not clear how modifying the Electrostriction can further improve piezoelectricity for polymers. Here, we report that Electrostriction can be significantly enhanced in poled poly(vinylidene fluoride-co-trifluoroethylene) [P(VDF-TrFE)] random copolymers containing extended-chain primary crystals and relaxor-like secondary crystals in the oriented amorphous fraction (SCOAF). As a result of the high polarizability of dipoles and ferroelectric nanodomains in the SCOAF, the inverse piezoelectric coefficient d31 reaches as high as 77 ± 5 pm/V for the P(VDF-TrFE) 55/45 copolymer at 55°C. This finding not only extends our understanding of piezoelectricity in polymers but also provides guidance for further enhancing the piezoelectricity of ferroelectric polymers in the future.
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Origins of Electrostriction in Poly(vinylidene fluoride)-Based Ferroelectric Polymers
Macromolecules, 2020Co-Authors: Thumawadee Wongwirat, Zhiwen Zhu, Guanchun Rui, Pitak Laoratanakul, Hathaikarn Manuspiya, Lei ZhuAbstract:Although Electrostriction is ubiquitous for dielectric polymers, giant Electrostriction has not been observed until relaxor ferroelectric (RFE) poly(vinylidene fluoride) (PVDF)-based polymers are a...
N I Zheludev - One of the best experts on this subject based on the ideXlab platform.
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giant electro optical effect through Electrostriction in a nanomechanical metamaterial
Advanced Materials, 2019Co-Authors: Artemios Karvounis, Behrad Gholipour, K F Macdonald, N I ZheludevAbstract:Electrostriction is a property of all naturally occurring dielectrics whereby they are mechanically deformed under the application of an electric field. It is demonstrated here that an artificial metamaterial nanostructure comprising arrays of dielectric nanowires, made of silicon and indium tin oxide, is reversibly structurally deformed under the application of an electric field, and that this reconfiguration is accompanied by substantial changes in optical transmission and reflection, thus providing a strong electro-optic effect. Such metamaterials can be used as the functional elements of electro-optic modulators in the visible to near-infrared part of the spectrum. A modulator operating at 1550 nm with effective Electrostriction and electro-optic coefficients of order 10-13 m2 V-2 and 10-6 m V-1 , respectively, is demonstrated. Transmission changes of up to 3.5% are obtained with a 500 mV control signal at a modulation frequency of ≈6.5 MHz. With a resonant optical response that can be spectrally tuned by design, modulators based on the artificial electrostrictive effect may be used for laser Q-switching and mode-locking among other applications that require modulation at megahertz frequencies.
Roman Korobko - One of the best experts on this subject based on the ideXlab platform.
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large nonclassical Electrostriction in y nb stabilized δ bi2o3
Advanced Functional Materials, 2016Co-Authors: Nimrod Yavo, Alaric D. Smith, Ori Yeheskel, Sydney Cohen, Roman Korobko, Ellen Wachtel, Peter R. Slater, Igor LubomirskyAbstract:Classical Electrostriction, describing a second-order electromechanical response of insulating solids, scales with elastic compliance, S, and inversely with dielectric susceptibility, e. This behavior, first noted 20 years ago by Robert Newnham, is shown to apply to a wide range of electrostrictors including polymers, glasses, crystalline linear dielectrics, and relaxor ferroelectrics. Electrostriction in fluorite ceramics of (Y, Nb)-stabilized δ-Bi2O3 is examined with 16%–23% vacant oxygen sites. Given the values of compliance and dielectric susceptibility, the Electrostriction coefficients are orders of magnitude larger than those expected from Newnham's scaling law. In ambient temperature nanoindentation measurements, (Y, Nb)-stabilized δ-Bi2O3 displays primary creep. These findings, which are strikingly similar to those reported for Gd-doped ceria, support the suggestion that ion conducting ceramics with the fluorite structure, a large concentration of anion vacancies and anelastic behavior, may constitute a previously unknown class of electrostrictors.
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Giant Electrostriction in Gd‐Doped Ceria
Advanced Materials, 2012Co-Authors: Roman Korobko, Ellen Wachtel, Anitha Patlolla, Anna Kossoy, Harry L. Tuller, Anatoly I. Frenkel, Igor LubomirskyAbstract:Gd-doped CeO(2) exhibits an anomalously large Electrostriction effect generating stress that can reach 500 MPa. In situ XANES measurements indicate that the stress develops in response to the rearrangement of cerium-oxygen vacancy pairs. This mechanism is fundamentally different from that of materials currently in use and suggests that Gd-doped ceria is a representative of a new family of high-performance electromechanical materials.