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Fei Li, Dabin Lin, Zibin Chen, Zhenxiang Cheng, Jianli Wang, ChunChun Li, Zhuo Xu, Qianwei Huang, Xiaozhou Liao, Long-Qing Chen, Thomas R Shrout, Shujun Zhang
Piezoelectric materials, which respond mechanically to applied electric field and vice versa, are essential for electromechanical transducers. Previous theoretical analyses have shown that high piezoelectricity in perovskite oxides is associated with a flat thermodynamic energy landscape connecting two or more ferroelectric phases. Here, guided by phenomenological theories and phase-field simulations, we propose an alternative design strategy to commonly used morphotropic phase boundaries to further flatten the energy landscape, by judiciously introducing local structural heterogeneity to manipulate interfacial energies (that is, extra interaction energies, such as electrostatic and elastic energies associated with the interfaces)...
March 19, 2018: Nature Materials
Francesca Malvano, Luigi Maritato, Giovanni Carapella, Pasquale Orgiani, Roberto Pilloton, Marisa Di Matteo, Donatella Albanese
Due to their interesting ferroelectric, conductive and dielectric properties, in recent years, perovskite-structured materials have begun to attract increasing interest in the biosensing field. In this study, a strontium titanate perovskite layer (SrTiO₃) has been synthesized on a platinum electrode and exploited for the development of an impedimetric label-free immunosensor for Escherichia coli O157:H7 detection. The electrochemical characterization of the perovskite-modified electrode during the construction of the immunosensor, as well as after the interaction with different E...
March 16, 2018: Biosensors
Hirofumi Akamatsu, Yakun Yuan, Vladimir A Stoica, Greg Stone, Tiannan Yang, Zijian Hong, Shiming Lei, Yi Zhu, Ryan C Haislmaier, John W Freeland, Long-Qing Chen, Haidan Wen, Venkatraman Gopalan
Using time- and spatially resolved hard x-ray diffraction microscopy, the striking structural and electrical dynamics upon optical excitation of a single crystal of BaTiO_{3} are simultaneously captured on subnanoseconds and nanoscale within individual ferroelectric domains and across walls. A large emergent photoinduced electric field of up to 20×10^{6}  V/m is discovered in a surface layer of the crystal, which then drives polarization and lattice dynamics that are dramatically distinct in a surface layer versus bulk regions...
March 2, 2018: Physical Review Letters
Yulong Bai, Ning Jiang, Shifeng Zhao
Nanocluster-assembled FeGa micron-scale discs prepared by low-energy cluster beam deposition were embedded into Bi5Ti3FeO15 matrices to form pseudo 1-3 heterostructure films. The microstructures and multiferroic properties were investigated. Good ferroelectric, piezoelectric, and ferromagnetic properties and giant magnetoelectric effects are achieved for the heterostructure films, which is ascribed to the depression of the clamped effect from the hard substrate for such pseudo 1-3 structures and the multi-interface coupling between the large magnetostrictive coefficient of FeGa micron-scale discs and the high piezoelectric coefficient of the circle surrounding the Bi5Ti3FeO15 matrices...
March 16, 2018: Nanoscale
Suman Raj Panday, Benjamin M Fregoso
A typo is corrected in Eq. 4 of the main text.
March 16, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Sergey Zhukov, Dagmar Eder-Goy, Sergey Fedosov, Bai-Xiang Xu, Heinz von Seggern
The present study is focused on tubular multi-channel arrays composed of commercial fluoropolymer (FEP) tubes with different wall thickness. After proper charging in a high electric field, such tubular structures exhibit a large piezoelectric [Formula: see text] coefficient significantly exceeding the values of classical polymer ferroelectrics and being even comparable to conventional lead-free piezoceramics. The quasistatic piezoelectric [Formula: see text] coefficient was theoretically derived and its upper limits were evaluated considering charging and mechanical properties of the arrays...
March 15, 2018: Scientific Reports
Clarisse Ribeiro, Carlos M Costa, Daniela M Correia, João Nunes-Pereira, Juliana Oliveira, Pedro Martins, Renato Gonçalves, Vanessa F Cardoso, Senentxu Lanceros-Méndez
Poly(vinylidene fluoride) (PVDF) and its copolymers are the polymers with the highest dielectric constants and electroactive responses, including piezoelectric, pyroelectric and ferroelectric effects. This semicrystalline polymer can crystallize in five different forms, each related to a different chain conformation. Of these different phases, the β phase is the one with the highest dipolar moment and the highest piezoelectric response; therefore, it is the most interesting for a diverse range of applications...
April 2018: Nature Protocols
Shi-Hao Zhang, Bang-Gui Liu
We propose through first-principles investigation that the GaTeCl monolayer is an excellent two-dimensional (2D) multiferroic with giant mechanical anisotropy. The calculated phonon spectrum, molecular dynamic simulations, and elastic moduli confirm its dynamic and mechanical stability, and our cleavage energy analysis shows that exfoliating one GaTeCl monolayer from the existing GaTeCl bulk is feasible. The calculated in-plane ferroelectric polarization reaches 578 pC m-1 . The energy barriers per formula unit of the ferroelastic 90° rotational and ferroelectric reversal transitions are 476 meV and 754 meV, respectively, being the greatest in the 2D multiferroics family so far...
March 15, 2018: Nanoscale
Tomohito Sekine, Ryo Sugano, Tomoya Tashiro, Jun Sato, Yasunori Takeda, Hiroyuki Matsui, Daisuke Kumaki, Fabrice Domingues Dos Santos, Atsushi Miyabo, Shizuo Tokito
The ability to monitor subtle changes in vital and arterial signals using flexible devices attached to the human skin can be valuable for the detection of various health conditions such as cardiovascular disease. Conventional Si device technologies are being utilised in traditional clinical systems; however, its fabrication is not easy owing to the difficulties in adapting to conventional processes. Here, we present the development of a fully printed, wearable, ferroelectric-polymer vital sensor for monitoring the human pulse wave/rate on the skin...
March 13, 2018: Scientific Reports
Jinkyoung Yoo, Towfiq Ahmed, Renjie Chen, Aiping Chen, Yeon Hoo Kim, Ki Chang Kwon, Chan Woong Park, Hee Seong Kang, Ho Won Jang, Young Joon Hong, Woo Seok Yang, Chul-Ho Lee
The preparation of crystalline materials on incommensurate substrates has been a key topic of epitaxy. van der Waals (vdW) epitaxy on two-dimensional (2D) materials opened novel opportunities of epitaxial growth overcoming the materials compatibility issue. Therefore, vdW epitaxy has been considered as a promising approach for the preparation of building blocks of flexible devices and thin film-based devices at the nano/microscale. However, an understanding of vdW epitaxy has not been thoroughly established...
March 13, 2018: Nanoscale
Sung Min Park, Bo Wang, Saikat Das, Seung Chul Chae, Jin-Seok Chung, Jong-Gul Yoon, Long-Qing Chen, Sang Mo Yang, Tae Won Noh
Flexoelectricity is an electromechanical coupling between electrical polarization and a strain gradient1 that enables mechanical manipulation of polarization without applying an electrical bias2,3 . Recently, flexoelectricity was directly demonstrated by mechanically switching the out-of-plane polarization of a uniaxial system with a scanning probe microscope tip3,4 . However, the successful application of flexoelectricity in low-symmetry multiaxial ferroelectrics and therefore active manipulation of multiple domains via flexoelectricity have not yet been achieved...
March 12, 2018: Nature Nanotechnology
R Moalla, S Cueff, J Penuelas, B Vilquin, G Saint-Girons, N Baboux, R Bachelet
Epitaxial PbZr0.52 Ti0.48 O3 (PZT) layers were integrated on Si(001) with single PZT {001} orientation, mosaïcity below 1° and a majority of a-oriented ferroelectric domains (∼65%). Ferroelectric and pyroelectric properties are determined along both the out-of-plane and in-plane directions through parallel-plate capacitor and coplanar interdigital capacitor along the <100>PZT direction. A large anisotropy in these properties is observed. The in-plane remnant polarization (21.5 µ ) is almost twice larger than that measured along the out-of-plane direction (13...
March 12, 2018: Scientific Reports
Haoxin Mai, Teng Lu, Qian Li, Zhifu Liu, Yongxiang Li, Felipe Kremer, Li Li, Ray L Withers, Haidan Wen, Yun Liu
The effect of above-bandgap photons on the domains of BiFeO3 thin film was investigated via piezoresponse force microscopy (PFM) and Kelvin probe force microscopy (KPFM). It is found that under the above bandgap illumination, the relaxation time of the polarization state was significantly extended while the effective polarizing voltage for the pristine domains was reduced. We propose that this photo-induced domain stabilization can be attributed to the interaction between photogenerated surface charges and domains...
March 9, 2018: ACS Applied Materials & Interfaces
Alexej Bubnov, Cyril Vacek, Michał Czerwiński, Terezia Vojtylová, Wiktor Piecek, Věra Hamplová
Several new lactic acid derivatives containing the keto linkage group far from the chiral part and short alkyl chains have been synthesized and characterised by polarising optical microscopy, differential scanning calorimetry, as well as electro-optic and dielectric spectroscopy. The materials possess a self-assembling behaviour on the nanoscale level as they form polar smectic liquid crystalline mesophases, namely the orthogonal paraelectric SmA* and the tilted ferroelectric SmC* phases, in a broad temperature range down to room temperature...
2018: Beilstein Journal of Nanotechnology
Jobin Varghese, Tuomo Siponkoski, Maciej Sobocinski, Timo Vahera, Heli Jantunen
This paper reports the first ultralow sintering temperature (450 oC) co-fired multifunctional ceramic substrate based on a commercial lead zirconium titanate (PZ29)-glass composite and fabricated by tape casting, isostatic lamination, and sintering. This substrate was prepared from a novel tape casting slurry composition suitable for co-firing at this low temperature with commercial Ag electrodes at 450 oC. The green cast tape and sintered substrate showed a surface roughness of 146 nm and 355 nm, respectively, suitable for device level fabrication by post-processing...
March 7, 2018: ACS Applied Materials & Interfaces
Longlong Fan, Jun Chen, Yang Ren, Xianran Xing
The evidence of fundamental lattice strain and domain switching contribution to the piezoelectric and ferroelectric responses of ceramics has been well studied, while the contribution from crystal structure variation has been rarely reported in terms of the existence of intergranular stress/strain and crystallographic texture. In the present study, the detailed electric field induced structure evolution in rhombohedral PbZr0.55 Ti0.45 O3 (PZT55) has been investigated by in-situ high-energy synchrotron diffraction...
March 7, 2018: Inorganic Chemistry
Kensuke Kobayashi, Sachio Horiuchi, Shoji Ishibashi, Youichi Murakami, Reiji Kumai
The field-induced antipolar-polar structural transition in an organic antiferroelectric 2-trifluoromethylnaphthimidazole (TFMNI) crystal is investigated by performing synchrotron X-ray diffraction. The polarities of all of the hydrogen-bonded chains become parallel with each other in the presence of an external electric field. The switch-ing is accompanied by a giant electrostriction, which provides one order of magnitude larger strain than the piezoelectric strain of the organic ferroelectrics: croconic acid and poly(vinylidene fluoride) (PVDF); however, it is comparable to those of typical commercial piezoelectric ceramics...
March 5, 2018: Journal of the American Chemical Society
S-H Park, B-Q Liu, D Behal, B Pedersen, A Schneidewind
The low temperature antiferromagnetic (AF) phase of MnWO4 (the so-called AF1 phase) exhibits different spin-canting configurations at two Mn2+ sublattices of the (3  +  1)-dimensional magnetic structure. The suggested superspace group [Formula: see text] is a significant consequence of the polar space group [Formula: see text]2 true for the nuclear structure of MnWO4 . Density functional theory calculations showed that its ground state prefers this two spin-canting system. The structural difference between two independent atomic sites for Mn (Mna , Mnb ) is too small to allow microscopically detectable electric polarisation...
March 2, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Changyi Liu, Hongwei Zhao, Zhichao Ma, Yuansen Qiao, Kun Hong, Zhuang Ren, Jianhai Zhang, Yongmao Pei, Luquan Ren
Functional materials represented by ferromagnetics and ferroelectrics are widely used in advanced sensor and precision actuation due to their special characterization under coupling interactions of complex loads and external physical fields. However, the conventional devices for material characterization can only provide a limited type of loads and physical fields and cannot simulate the actual service conditions of materials. A multi-field coupling instrument for characterization has been designed and implemented to overcome this barrier and measure the comprehensive physical properties under complex service conditions...
February 2018: Review of Scientific Instruments
David Andres Fernandez-Benavides, Aixa Ibeth Gutierrez-Perez, Angelica Maria Benitez-Castro, Maria Teresa Ayala-Ayala, Barbara Moreno-Murguia, Juan Muñoz-Saldaña
We report a comprehensive comparative study of ferroelectric and piezoelectric properties of BNT-BKT-BT ceramics through the MPB (morphotropic phase boundary) zone, from the rhombohedral to the tetragonal phases in the system (97.5- x )(Bi0.5 Na0.5 )TiO₃ + x (Bi0.5 K0.5 )TiO₃ + 2.5(BaTiO₃), where x = 0 to 24.5 mol %. The structural transitions were studied by XRD patterns and Raman spectra. The MPB was confirmed between x = 10 and 12.5 mol % BKT. The dielectric/ferroelectric/piezoelectric properties of the BNT-BKT-BT system are maximized in the MPB region exhibiting a dielectric constant of 1506, a remanent polarization of 34...
March 1, 2018: Materials
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