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Large electrical strain in lead-free K_(0.5)Na_(0.5)NbO_(3)-based ceramics by heterovalent doping

Journal of Materiomics 2023年第5期9卷 959-970页

作者： Xiangjian Wang Jun Wang Wenping Geng Guohua Dong Brahim Dkhil Xiaojie Lou Department of Information Engineering Quzhou College of TechnologyQuzhou324000China Frontier Institute of Science and Technology and State Key Laboratory for Mechanical Behavior of MaterialsXi'an Jiaotong UniversityXi'an710049China Science and Technology on Electronic Test and Measurement Laboratory North University of ChinaTaiyuan030051China Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education&International Center for Dielectric ResearchXi'an Jiaotong UniversityXi'an710049China Applied Physics Division of Materials ScienceDepartment of Engineering Sciences and MathematicsLuleåUniversity of TechnologySE-97187LuleåSweden Laboratoire Structures Proprietes et Modelisation des SolidesUniversite Paris SaclayCentraleSupelecCNRS-UMR8580Grande Voie des VignesCh^atenay MalabryCedex92295France

Heterovalent doped(K_(0.48-0.07)xNa_(0.52-0.43)xBi_(0.5)x)(Nb_(0.95-0.95x)Sb_(0.05-0.05x)Zrx)O_(3)ceramics were fabricated using conventional solid-state ***,the phase structures,dielectric,ferroelectric,and electricstrain properties were *** compositions were tuned to be located at polymorphic phase boundary with increasing heterovalent Bi3t and Zr4t doping levels.A large strain of 0.19%was obtained at relatively low electric fields of 30 kV/cm in the composition of x=*** normalized large-signal d33*values were approximately 633 pm/V under a low driving electric field of 30 kV/cm,which were comparable or larger than the values reported for other lead-free *** large strains obtained can be attributed to the formation of nanodomains and high-density domain walls,which were confirmed by the observations of domain morphology using transmission electron microscopy(TEM)*** temperature stability of the strain properties of the x=0.04 sample could be ascribed to the sluggish behaviour for the local structural heterogeneity in heterovalent-ion doped KNN *** simulations revealed that the Zr^(4t)produce the local stress at the BO6 octahedra and Bi3t could yield off-centering of AO12 ployhedron due to the nature of Bi 6s lone pair electrons,which induced lattice expansion and local distortions in the *** local displacements are strongly anisotropic in heterovalent-ion doped *** is believed that random local fields exist in these compositions owing to the eixstence of charge *** heterovalent doping of Bi^(3t)and Zr^(4t)could destory simultaneously the orthorhombic symmetry and the short-range ferroelecctric order,leading to the formation of complex nanodomains and local structral *** doping may,therefore,offer a new avenve to design novel K0.5Na0.5NbO3(KNN)-based materials for their mutifunctional applications.

关键词： Lead-free Strain Heterovalent doping Local structure Nanodomain

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Advanced TiO2/Al2O3 Bilayer ALD Coatings for Improved Lithium-Rich Layered Oxide Electrodes

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ACS applied Materials and Interfaces 2024年第10期16卷 13029-13040页

作者： Chen, Wei-Ming Hsieh, Hsin-Yu Wu, Dong-Ze Tang, Horng-Yi Chang-Liao, Kuei-Shu Chi, Po-Wei Wu, Phillip M. Wu, Maw-Kuen Institute of Physics Academia Sinica 128 Section 2 Academia Road Taipei11529 Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica and National Tsing Hua University 128 Section 2 Academia Road Taipei11529 Taiwan Department of Engineering and System Science National Tsing Hua University 101 Section 2 Kuang-Fu Road Hsinchu300044 Taiwan Graduate Institute of Energy and Sustainability Technology National Taiwan University of Science and Technology 43 Keelung Road Sec 4 Taipei10607 Taiwan Department of Applied Chemistry National Chi Nan University 1 University Road Puli Nantou545301 Taiwan College of Science National Chung Hsing University 145 Xingda Rd. South Dist. Taichung City402 Taiwan

Surface modification is a highly effective strategy for addressing issues in lithium-rich layered oxide (LLO) cathodes, including phase transformation, particle cracking, oxygen gas release, and transition-metal ion dissolution. Existing single-/double-layer coating strategies face drawbacks such as poor component contact and complexity. Herein, we present the results of a low-temperature atomic layer deposition (ALD) process for creating a TiO2/Al2O3 bilayer on composite cathodes made of AS200 (Li1.08Ni0.34Co0.08Mn0.5O2). Electrochemical analysis demonstrates that TiO2/Al2O3-coated LLO electrodes exhibit improved discharge capacities and enhanced capacity retention compared with uncoated samples. The TAA-5/AS200 bilayer-coated electrode, in particular, demonstrates exceptional capacity retention (∼90.4%) and a specific discharge capacity of 146 mAh g-1 after 100 cycles at 1C within the voltage range of 2.2 to 4.6 V. The coated electrodes also show reduced voltage decay, lower surface film resistance, and improved interfacial charge transfer resistances, contributing to enhanced stability. The ALD-deposited TiO2/Al2O3 bilayer coatings exhibit promising potential for advancing the electrochemical performance of lithium-rich layered oxide cathodes in lithium-ion batteries. © 2024 The Authors. Published by American Chemical Society.

关键词： Cathodes

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Non-Hermitian selective thermal emitter for thermophotovoltaics

Non-Hermitian selective thermal emitter for thermophotovolta...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Ciril S. Prasad Samuel C. Raphaelson Gururaj V. Naik Department of Electrical and Computer Engineering Rice University Houston TX USA Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston TX USA Department of Material Science and NanoEngineering Rice University Houston TX USA

Selective thermal emitters can boost the efficiency of heat-to-electricity conversion in thermophotovoltaic systems only if their spectral selectivity is high. We demonstrate a non-Hermitian metasurface-based selectiv... 详细信息

ISBN: (纸本)9781957171258

关键词： Emissivity Light intensity Optical constants Silicon Temperature Thermal emission

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The Canadian RADiation Impacts on Climate and Atmospheric Loss Satellite (RADICALS) Mission: Exploring the Coupling of Space Weather and Terrestrial Climate

The Canadian RADiation Impacts on Climate and Atmospheric Lo...

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2024 Small Satellites Systems and Services Symposium, 4S 2024

作者： Mann, Ian R. Cully, C.M. Fedosejevs, R. Milling, D.K. Enno, G.A. Lipsett, M. Zee, R.E. Larouche, B.P. Rankin, R. Connors, M.G. McWilliams, K.A. Ward, W.E. Fiori, R.A. Olifer, L. Ozeke, L. Marshall, R.A. Cullen, D. Barona, D. Howarth, A.D. Yau, A.W. University of Alberta Department of Physics 11335 Saskatchewan Drive NW EdmontonABT6G 2H5 Canada University of Calgary Department of Physics & Astronomy 2500 University Drive NW CalgaryABT2N 1N4 Canada University of Alberta Department of Electrical and Computer Engineering 9211 116 St NW EdmontonABT6G 1H9 Canada University of Alberta Department of Mechanical Engineering 9211 116 St NW EdmontonABT6G 1H9 Canada Space Flight Laboratory University of Toronto Institute for Aerospace Studies 4925 Dufferin Street TorontoONM3H-5T6 Canada Athabasca University 1 University Drive AthabascaABT9S 3A3 Canada University of Saskatchewan Department of Physics & Engineering Physics 9 Campus Drive SaskatoonSKS7N 5A5 Canada University of New Brunswick Department of Physics 8 Bailey Ave FrederictonNBE3A 1H4 Canada Canadian Space Weather Forecast Centre Natural Resources Canada 2617 Anderson Rd OttawaONK1A 0E7 Canada University of Colorado at Boulder College of Engineering and Applied Science 1111 Engineering Drive 422 UCB BoulderCO80309-0422 United States

ISBN: (纸本)9781510688940

The RADiation Impacts on Climate and Atmospheric Loss Satellite (RADICALS) is a low-Earth orbiting Canadian small satellite mission investigating the transport of space radiation into the atmosphere, and its impact on Earth’s climate. Scheduled for launch in late 2026, the mission will launch into a polar orbit with an integrated payload comprising two back-to-back look direction High Energy Particle (RADHEPT) telescopes, an X-Ray Imager (XRI) to remote sense energetic particle precipitation using back-scattered Bremsstrahlung X-rays, and a boom mounted FluxGate Magnetometer (FGM) and Search Coil Magnetometer (SCM). Using an innovative Thomson spin-stabilized configuration, the satellite will sample the pitch angle distributions in the spin-plane twice per spin. The back-to-back RADHEPT look directions allow for a contemporaneous view of the down-going and back-scattered up-going electrons, at the same time the XRI remote-senses the related Bremsstrahlung, and the magnetometers provide in-situ magnetic signatures of a range of plasma waves. The key measurement of the pitch angle resolved energetic electron precipitation (EEP) and related back-scatter, including a resolved loss cone, will allow a detailed assessment of the energetic particle energy input to the atmosphere. Measurements of EEP, in addition to measurements of solar energetic particle (SEP) precipitation, will represent a critical data set for assessing the role of space radiation in the climate system, for example through the catalytic destruction of ozone in the middle atmosphere by NOx and HOx. Accurately quantifying the impacts of this space radiation on climate requires accurate and loss cone-resolved characterization of the flux of these precipitating energetic particles for inclusion into whole atmosphere models. The RADICALS explorer will also enable research into potentially catastrophic space-weather radiation effects on satellite infrastructure, and assess impacts on space weather-related int

关键词： Magnetometers

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Top-Down Fabrication of Diamond Nanostructures

SSRN

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SSRN 2024年

作者： Biswas, Abhijit Li, Chenxi Pieshkov, Tymofii Mei, Zhaobo Xu, Mingfei Li, Tao Murukeshan, Jishnu Vajtai, Robert Zhao, Yuji Ajayan, Pulickel M. Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States

Diamond nanostructures can have exciting applications in electronics and thermal management, but their controlled fabrication can be challenging. Here, we present a top-down approach for the fabrication of diamond nanorod (DNR) clusters, via use of metal masks (Al, Ag, Au, and Cr) and reactive-ion etching (RIE). Prolonged RIE on Ag and Cr masks yields distinct etching profiles, and DNR clusters are selectively formed from Ag masks, with individual nanorods having dimensions of ~100 nm diameter and ~1.5 µm length. Detailed electron microscopy shows thin layer of amorphous carbon (a-C) around single crystalline DNR cores. Chemical analyses also show presence of oxygen on the surface of the DNRs. Fabrication of the DNR clusters with scalable top-down approach could lead to new nanodiamond-based applications. © 2024, The Authors. All rights reserved.

关键词： Nanorods

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Copper delocalization leads to ultralow thermal conductivity in chalcohalide CuBiSeCl2

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Physical Review B 2025年第19期111卷 195207-195207页

作者： Yuzhou Hao Junwei Che Xiaoying Wang Xuejie Li Turab Lookman Jun Sun Xiangdong Ding Zhibin Gao State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering Xi'an Jiaotong University Xi'an 710049 China Department of Applied Physics Xi'an University of Science and Technology Xi'an 710054 China AiMaterials Research LLC Santa Fe New Mexico 87501 USA

Mixed anion halide-chalcogenide materials have attracted considerable attention due to their exceptional optoelectronic properties, making them promising candidates for various applications. Among these, CuBiSeCl2 has recently been experimentally identified with remarkably low lattice thermal conductivity (κL). In this study, we employ Wigner transport theory combined with neuroevolution machine learning potential-assisted self-consistent phonon calculations to unravel the microscopic origins of this low κL. Our findings reveal that the delocalization and weak bonding of copper atoms are key contributors to the strong phonon anharmonicity and wavelike tunneling (random walk diffusons). These insights deepen our understanding of the relationship between bonding characteristics, anharmonicity, delocalization, and vibrational dynamics, paving the way for the design and optimization of CuBiSeCl2 and analogous materials for advanced phonon engineering applications.

关键词： Positive temperature coefficient

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The Small-World Effect for Interferometer Networks

arXiv

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arXiv 2023年

作者： Krawciw, Benjamin Carr, Lincoln D. Behn, Cecilia Diniz Department of Applied Mathematics and Statistics Colorado School of Mines GoldenCO United States Department of Physics Colorado School of Mines GoldenCO United States Quantum Engineering Program Colorado School of Mines GoldenCO United States

Complex network theory has focused on properties of networks with real-valued edge weights. However, in signal transfer networks, such as those representing the transfer of light across an interferometer, complex-valued edge weights are needed to represent the manipulation of the signal in both magnitude and phase. These complex-valued edge weights introduce interference into the signal transfer, but it is unknown how such interference affects network properties such as small-worldness. To address this gap, we have introduced a small-world interferometer network model with complex-valued edge weights and generalized existing network measures to define the interferometric clustering coefficient, the apparent path length, and the interferometric small-world coefficient. Using high-performance computing resources, we generated a large set of small-world interferometers over a wide range of parameters in system size, nearest-neighbor count, and edge-weight phase and computed their interferometric network measures. We found that the interferometric small-world coefficient depends significantly on the amount of phase on complex-valued edge weights: for small edge-weight phases, constructive interference led to a higher interferometric small-world coefficient;while larger edge-weight phases induced destructive interference which led to a lower interferometric small-world coefficient. Thus, for the small-world interferometer model, interferometric measures are necessary to capture the effect of interference on signal transfer. This model is an example of the type of problem that necessitates interferometric measures, and applies to any wave-based network including quantum networks. Copyright © 2023, The Authors. All rights reserved.

关键词： Interferometers

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Electric leakage suppression of phase-transforming ferroelectrics with donor impurities

arXiv

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arXiv 2024年

作者： Zhang, Chenbo Peng, Xiaotong Liu, Bo Zhang, Kai Chen, Xian MOE Key Laboratory of Advanced Micro-Structured Materials School of Physics Science and Engineering Institute for Advanced Study Tongji University Shanghai200092 China School of Aerospace Engineering and Applied Mechanics Tongji University Shanghai200092 China Department of Mechanical and Aerospace Engineering Hong Kong University of Science and Technology Clear Water Bay Hong Kong

Phase-transforming ferroelectric materials are widely used in energy harvesting and conversion devices. However, the functionality of these devices is significantly impeded by electrical leakage at high temperatures. In this study, we fundamentally study the mechanism of electrical leakage suppression due to phase transformation in a series of donor-doped ferroelectric oxides, Ba0.955Eu0.03Ti1−xZrxO3 with 0 ≤ x ≤ 0.15. Our experiments clearly demonstrate that the symmetry-breaking phase transformations result in the reduction in electrical conductivity of the donor-doped ferroelectric oxides. The DFT calculation suggests that the donor energy level undergoes a shallow-to-deep transition at the phase transformation temperature. By analyzing the constitutive model of the leakage current density function, we propose a leakage suppression coefficient that rationalizes the development of ferroelectrics with low electrical leakage at elevated temperatures. © 2024, CC BY.

关键词： Ferroelectric materials

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Magnetic structure and field-induced transitions in the triangular spin-1 antiferromagnet NiNb2O6: Observation of a triple point

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Physical Review B 2023年第22期108卷 224430-224430页

作者： Maruthi R Sobhit Singh Sayandeep Ghosh Mohindar S. Seehra Bruno Weise Wilfrid Prellier Subhash Thota Department of Physics Indian Institute of Technology Guwahati Assam 781039 India Department of Physics B.M.S. College of Engineering Bangalore 560019 Karnataka India Department of Mechanical Engineering University of Rochester Rochester New York 14627 USA Materials Science Program University of Rochester Rochester New York 14627 USA Department of Physics Chungnam National University Daejeon 34134 Republic of Korea Department of Physics Kunsan National University Gunsan 54150 Republic of Korea Department of Physics & Astronomy West Virginia University Morgantown West Virginia 26506 USA Leibniz-IFW Dresden Institute for Complex Materials D-01069 Dresden Germany CRISMAT laboratory Normandy University ENSICAEN UNICAEN National Center for Scientific Research 14000 Caen France

A comprehensive experiment-theory study on the magnetic field-induced spin-flip transitions (HC1 and HC2) and the field-temperature (H−T) phase diagram of nickel niobate (NiNb2O6) polycrystals is reported. Magnetic susceptibility (χ) measurements reveal the presence of quasi-one-dimensional magnetism with spin-1 Ni2+ Heisenberg spin chains, instead of Ising chains, along the easy axis (c axis). The ferromagnetic intrachain exchange-interaction strength, J0/kB (=4.20 K), between Ni2+ ions in the c axis is estimated from the molecular-field theory approximation. The interchain exchange interactions J1/kB=−1.335 K and J2/kB=−1.298 K have been determined from the experimentally obtained magnitudes of HC1=10.8 kOe and spin-saturated field HS=38 kOe. These magnitudes are consistent with the total magnetic exchange-interaction strength, J/kB=7.00 K obtained from χ−T data fitted with the Heisenberg linear chain model and our density-functional theory (DFT+U) calculations. The overall antiferromagnetic behavior of the NiNb2O6 system, correctly captured within our DFT+U calculations, occurs below TN=5.59±0.02 K as determined from the analysis of the specific heat (CP−T) data. The CP vs T data near TN is fitted to power-law expression CP=A|T−TN|−α yielding the critical exponent α=0.349(2) [0.349(1)] for T>TN (T

关键词： Magnetic interactions Magnetic phase transitions Magnetism Structural properties

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Observation of Colossal Terahertz Magnetoresistance and Magnetocapacitance in a Perovskite Manganite

arXiv

引用

arXiv 2023年

作者： Tay, Fuyang Chaudhary, Swati He, Jiaming Peraca, Nicolas Marquez Baydin, Andrey Fiete, Gregory A. Zhou, Jianshi Kono, Junichiro Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Physics University of Texas at Austin AustinTX78712 United States Department of Physics Northeastern University BostonMA02115 United States Department of Physics Massachusetts Institute of Technology CambridgeMA02139 United States Materials Science and Engineering Program Mechanical Engineering University of Texas at Austin AustinTX78712 United States Department of Physics and Astronomy Rice University HoustonTX77005 United States Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States

We have studied the terahertz response of a bulk single crystal of La0.875Sr0.125MnO3at around its Curie temperature, observing large changes in the real and imaginary parts of the optical conductivity as a function of magnetic field. The terahertz resistance and capacitance extracted from the optical conductivity rapidly increased with increasing magnetic field and did not show any sign of saturation up to 6 T, reaching 60% and 15%, respectively, at 180 K. The observed terahertz colossal magnetoresistance and magnetocapacitance effects can be qualitatively explained by using a two-component model that assumes the coexistence of two phases with vastly different conductivities. These results demonstrate the potential use of perovskite manganites for developing efficient terahertz devices based on magnetic modulations of the amplitude and phase of terahertz waves. Copyright © 2023, The Authors. All rights reserved.

关键词： Optical conductivity

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