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Chang Liu, Wenhui Wan, Sai Gong, Hongbin Zhang, Wei Guo
Due to the demand of controlling magnetism by electric fields for future storage devices, materials with magnetoelectric coupling are of great interests. Based on first-principles calculations, we study the electronic and magnetic properties of a double perovskite Sr2CoMoO6 (SCMO) in a hybrid heterostructure combined with BaTiO3 (BTO) in different polarization states. The calculations show that by introducing ferroelectric state in BTO, SCMO transforms from an antiferromagnetic semiconductor to a half-metal...
June 20, 2017: Scientific Reports
M Nowak, T Tański, P Szperlich, W Matysiak, M Kępińska, D Stróż, Ł Bober, B Toroń
A novel polymeric, polyacrylonitrile (PAN) nanofibers containing ferroelectric and semiconducting antimony sulfoiodide (SbSI) have been made by electrospinning. SbSI nanowires, used as the filler, have been prepared sonochemically from antimony sulphide (Sb2S3) and antimony tri-iodide (SbI3) for the first time. Nanocrystalline SbSI has been fabricated in ethanol under ultrasonic irradiation (20kHz, 565W/cm(2)) at 323K within 2h. The products have been characterized by using techniques such as powder X-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis, high-resolution transmission electron microscopy, selected area electron diffraction and optical diffuse reflection as well as transmission spectroscopy...
September 2017: Ultrasonics Sonochemistry
Aleksandr V Plokhikh, Matthias Falmbigl, Iryna S Golovina, Andrew R Akbashev, Igor A Karateev, Mikhail Y Presnyakov, Alexander L Vasiliev, Jonathan E Spanier
We report on the growth of polycrystalline BiFeO3 thin films on SiO2 /Si(001) and Pt(111) substrates by atomic layer deposition using the precursors ferrocene, triphenyl-bismuth, and ozone. By growing alternating layers of Fe2 O3 and Bi2 O3 , we employ a superlattice approach and demonstrate an efficient control of the cation stoichiometry. The superlattice decay and the resulting formation of polycrystalline BiFeO3 films are studied by in situ X-ray diffraction, in situ X-ray photoelectron spectroscopy, and transmission electron microscopy...
June 20, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Jie Jiang, Yugandhar Bitla, Chun-Wei Huang, Thi Hien Do, Heng-Jui Liu, Ying-Hui Hsieh, Chun-Hao Ma, Chi-Yuan Jang, Yu-Hong Lai, Po-Wen Chiu, Wen-Wei Wu, Yi-Chun Chen, Yi-Chun Zhou, Ying-Hao Chu
We present a promising technology for nonvolatile flexible electronic devices: A direct fabrication of epitaxial lead zirconium titanate (PZT) on flexible mica substrate via van der Waals epitaxy. These single-crystalline flexible ferroelectric PZT films not only retain their performance, reliability, and thermal stability comparable to those on rigid counterparts in tests of nonvolatile memory elements but also exhibit remarkable mechanical properties with robust operation in bent states (bending radii down to 2...
June 2017: Science Advances
Xuegang Chen, Xin Zhang, Mark A Koten, Hanghui Chen, Zhiyong Xiao, Le Zhang, Jeffrey E Shield, Peter A Dowben, Xia Hong
Heteroepitaxial coupling at complex oxide interfaces presents a powerful tool for engineering the charge degree of freedom in strongly correlated materials, which can be utilized to achieve tailored functionalities that are inaccessible in the bulk form. Here, the charge-transfer effect between two strongly correlated oxides, Sm0.5 Nd0.5 NiO3 (SNNO) and La0.67 Sr0.33 MnO3 (LSMO), is exploited to realize a giant enhancement of the ferroelectric field effect in a prototype Mott field-effect transistor. By switching the polarization field of a ferroelectric Pb(Zr,Ti)O3 (PZT) gate, nonvolatile resistance modulation in the Mott transistors with single-layer SNNO and bilayer SNNO/LSMO channels is induced...
June 19, 2017: Advanced Materials
Lei Zhao, Qing Liu, Jing Gao, Shujun Zhang, Jing-Feng Li
Antiferroelectric materials that display double ferroelectric hysteresis loops are receiving increasing attention for their superior energy storage density compared to their ferroelectric counterparts. Despite the good properties obtained in antiferroelectric La-doped Pb(Zr,Ti)O3 -based ceramics, lead-free alternatives are highly desired due to the environmental concerns, and AgNbO3 has been highlighted as a ferrielectric/antiferroelectric perovskite for energy storage applications. Enhanced energy storage performance, with recoverable energy density of 4...
June 19, 2017: Advanced Materials
K S Asha, Niyaz Ahmed, Ramesh Nath, Denis Kuznetsov, Sukhendu Mandal
Postsynthetic modification is a promising tool for introducing multifunctional properties in metal-organic frameworks (MOFs). The effects of postsynthetic metal addition/exchange in a barium-based MOF have been well examined toward their magnetic and electrical properties. The rattling motion of the extraframework organic cation is responsible for the ferroelectric behavior. The strong magnetic frustration in Tb@1 is found to arise from the nearly triangular arrangement of Tb(3+) ions in its secondary building unit along the chain direction...
June 19, 2017: Inorganic Chemistry
Tom T A Lummen, J Leung, Amit Kumar, X Wu, Y Ren, Brian K VanLeeuwen, Ryan C Haislmaier, Martin Holt, Keji Lai, Sergei V Kalinin, Venkatraman Gopalan
The design of new or enhanced functionality in materials is traditionally viewed as requiring the discovery of new chemical compositions through synthesis. Large property enhancements may however also be hidden within already well-known materials, when their structural symmetry is deviated from equilibrium through a small local strain or field. Here, the discovery of enhanced material properties associated with a new metastable phase of monoclinic symmetry within bulk KNbO3 is reported. This phase is found to coexist with the nominal orthorhombic phase at room temperature, and is both induced by and stabilized with local strains generated by a network of ferroelectric domain walls...
June 19, 2017: Advanced Materials
Haifa Zhai, Yurong Jiang, Hongjing Li, Panpan Zhang, Yixiao He, Dandan Shi, Xiang Zhang, Jien Yang
Pb(Zr0.52Ti0.48)O3/polycarbonate (PZT/PC) composite films with different concentration of PZT ferroelectric nanocrystals are prepared. The polarization and dielectric relaxation behavior of PZT ferroelectric nanocrystals are characterized using in situ transmittance and X-ray diffraction (XRD) measurements for the first time. It's found that 10% PZT/PC composite film has the largest orientation change and negligible dielectric relaxation after poling (the φ value of 13.8% is almost constant with time even for 168 h)...
June 2017: Heliyon
Luca Corbellini, Christian Lacroix, Catalin Harnagea, Andreas Korinek, Gianluigi A Botton, David Ménard, Alain Pignolet
Epsilon ferrite (ε-Fe2O3) is a metastable phase of iron(III) oxide, intermediate between maghemite and hematite. It has recently attracted interest because of its magnetocrystalline anisotropy, which distinguishes it from the other polymorphs, and results in a gigantic coercive field and a natural ferromagnetic resonance frequency in the THz range. Moreover, it possesses a polar crystal structure, making it a potential ferroelectric, hence a potential multiferroic. Due to the need of size confinement to stabilize the metastable phase, ε-Fe2O3 has been synthesized mainly as nanoparticles...
June 16, 2017: Scientific Reports
Raad Haleoot, Charles Paillard, Thaneshwor P Kaloni, Mehrshad Mehboudi, Bin Xu, L Bellaiche, Salvador Barraza-Lopez
Photostriction is predicted for group-IV monochalcogenide monolayers, two-dimensional ferroelectrics with rectangular unit cells (the lattice vector a_{1} is larger than a_{2}) and an intrinsic dipole moment parallel to a_{1}. Photostriction is found to be related to the structural change induced by a screened electric polarization (i.e., a converse piezoelectric effect) in photoexcited electronic states with either p_{x} or p_{y} (in-plane) orbital symmetry that leads to a compression of a_{1} and a comparatively smaller increase of a_{2} for a reduced unit cell area...
June 2, 2017: Physical Review Letters
Monika Trzebiatowska, Bartosz Zarychta, Adam Pikul, Mirosław Mączka, Paulina Peksa, Ryszard Poprawski
A set of five novel formate frameworks templated with assemblies comprising diprotonated 1,2-diaminoethane (DAE) and a water molecule of the formula: [NH3(CH2)2NH3]M2(HCOO)6·H2O, where M = Mg, Mn, Co, Ni, Zn, has been synthesized. Four compounds crystallize in the polar R3 space group and one in the chiral P6322 space group (Ni-analog) at room temperature. The polyammonium-water assemblies, mutually joined by hydrogen bonds, fill the cavities of the frameworks and are disordered in the three latter compounds...
June 16, 2017: Physical Chemistry Chemical Physics: PCCP
Xiaoyan Liu, Minoru Osada, Kenji Kitamura, Takahiro Nagata, Donghui Si
Assemble metal nanoparticles into various ordered structures with scale up to centimeter area is required to meet diverse needs of lab-on-a-chips and analytic components. Here, we present the uniform and high-yield fabrication of centimeter-scale gold nanoparticles (AuNPs) array for SERS substrates. Ferroelectric-assisted assembly of AuNPs line array is successfully fabricated by using a periodically poled LiNbO3 (PPLN) single crystal as a template. SNOM-Raman shows that the uniform assembly of AuNPs exhibits a high density of "hot spots" arising from strong electromagnetic (EM) field coupling induced by adjacent AuNPs...
June 15, 2017: Scientific Reports
Rick Keesman, Jules Lamers
We perform a numerical study of the F model with domain-wall boundary conditions. Various exact results are known for this particular case of the six-vertex model, including closed expressions for the partition function for any system size as well as its asymptotics and leading finite-size corrections. To complement this picture we use a full lattice multicluster algorithm to study equilibrium properties of this model for systems of moderate size, up to L=512. We compare the energy to its exactly known large-L asymptotics...
May 2017: Physical Review. E
Mighfar Imam, Natasa Stojic, N Binggeli
Band alignments in ferroelectric tunnel junctions (FTJs) are expected to play a critical role in determining the charge transport across the tunneling barrier. In general, however, the interface band discontinuities and their polarization dependence are not well known in these systems. Using a first-principles density-functional-theory approach, we explore the ferroelectric polarization dependence of the band alignments in La0.7Sr0.3MnO3/PbZr0.2Ti0.8O3/Co (LSMO/PZT/Co) multiferroic tunnel junctions, for which recent experiments indicated an ON/OFF conductivity behavior upon switching the PZT ferroelectric polarization...
June 15, 2017: Nanotechnology
Shoulin Gu, Xiaoxue Zhou, Fengang Zheng, Liang Fang, Wen Dong, Mingrong Shen
A porous carbon layer was inserted between a BiFeO3 film and a Pt catalyst for efficient solar water splitting. A photocathodic current density of -235.4 μA cm(-2) at 0 V versus RHE and an onset potential of 1.19 V versus RHE were obtained under 100 mW cm(-2) Xe-lamp illumination.
June 15, 2017: Chemical Communications: Chem Comm
Hiroyuki Takenaka, Ilya Grinberg, Shi Liu, Andrew M Rappe
Despite more than 50 years of investigation, it is still unclear how the underlying structure of relaxor ferroelectrics gives rise to their defining properties, such as ultrahigh piezoelectric coefficients, high permittivity over a broad temperature range, diffuse phase transitions, strong frequency dependence in dielectric response, and phonon anomalies. The model of polar nanoregions inside a non-polar matrix has been widely used to describe the structure of relaxor ferroelectrics. However, the lack of precise knowledge about the shapes, growth and dipole patterns of polar nanoregions has led to the characterization of relaxors as "hopeless messes", and no predictive model for relaxor behaviour is currently available...
June 14, 2017: Nature
Atsushi Seki, Yusuke Funatsu, Masahiro Funahashi
(S)- and (R)-forms of chiral π-conjugated ferroelectric liquid crystals were synthesized. The dielectric properties in the ferroelectric liquid-crystalline (FLC) phases were evaluated using the Sawyer-Tower method. Spontaneous polarization of (S)-1 reached 68 nC cm(-2) at 127 °C. Hole mobilities in the FLC phases estimated using the time-of-flight (TOF) method were on the order of 10(-4) cm(2) V(-1) s(-1). Each chiral π-conjugated compound exhibited a photovoltaic effect based on spontaneous polarization without p-n or Schottky junctions...
June 13, 2017: Physical Chemistry Chemical Physics: PCCP
Jing Zhang, Wei Xu, Peng Sheng, Guangyao Zhao, Daoben Zhu
Organic donor-acceptor (DA) complexes have attracted wide attention in recent decades, resulting in the rapid development of organic binary system electronics. The design and synthesis of organic DA complexes with a variety of component structures have mainly focused on metallicity (or even superconductivity), emission, or ferroelectricity studies. Further efforts have been made in high-performance electronic investigations. The chemical versatility of organic semiconductors provides DA complexes with a great number of possibilities for semiconducting applications...
June 13, 2017: Accounts of Chemical Research
Hangwen Guo, Zhen Wang, Shuai Dong, Saurabh Ghosh, Mohammad Saghayezhian, Lina Chen, Yakui Weng, Andreas Herklotz, Thomas Z Ward, Rongying Jin, Sokrates T Pantelides, Yimei Zhu, Jiandi Zhang, E W Plummer
Interfaces between materials present unique opportunities for the discovery of intriguing quantum phenomena. Here, we explore the possibility that, in the case of superlattices, if one of the layers is made ultrathin, unexpected properties can be induced between the two bracketing interfaces. We pursue this objective by combining advanced growth and characterization techniques with theoretical calculations. Using prototype La2/3Sr1/3MnO3 (LSMO)/BaTiO3 (BTO) superlattices, we observe a structural evolution in the LSMO layers as a function of thickness...
June 12, 2017: Proceedings of the National Academy of Sciences of the United States of America
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