A5100330053- Advanced Thermoelectric Materials and Devices
- Thermal properties of materials
- Physics of Superconductivity and Magnetism
- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Magnetic properties of thin films
- 2D Materials and Applications
- Semiconductor materials and interfaces
- Thermal Expansion and Ionic Conductivity
- Graphene research and applications
- Thermal Radiation and Cooling Technologies
- Topological Materials and Phenomena
- Theoretical and Computational Physics
- Chalcogenide Semiconductor Thin Films
- Heusler alloys: electronic and magnetic properties
- Quantum and electron transport phenomena
- Superconductivity in MgB2 and Alloys
- Caching and Content Delivery
- Ammonia Synthesis and Nitrogen Reduction
- Multiferroics and related materials
- Advancements in Battery Materials
- Phase Change Materials Research
- Magneto-Optical Properties and Applications
- Mechanical and Optical Resonators
- Boron and Carbon Nanomaterials Research
University of California, Riverside
2015-2025
Xihua University
2018-2025
Guangzhou Institute of Geochemistry
2024
University of Chinese Academy of Sciences
2016-2024
Chinese Academy of Sciences
2022-2024
Ministry of Housing and Urban-Rural Development
2024
Peking University
2017-2024
Peking University Third Hospital
2024
Xuzhou Medical College
2024
Shandong University
2024
Conventional theory predicts that ultrahigh lattice thermal conductivity can only occur in crystals composed of strongly bonded light elements, and it is limited by anharmonic three-phonon processes. We report experimental evidence departs from these long-held criteria. measured a local room-temperature exceeding 1000 watts per meter-kelvin an average bulk value reaching 900 boron arsenide (BAs) crystals, where arsenic are heavy respectively. The high values consistent with proposal for...
Materials with high thermal conductivity (κ) are of technological importance and fundamental interest. We grew cubic boron nitride (cBN) crystals controlled abundance isotopes measured κ greater than 1600 watts per meter-kelvin at room temperature in samples enriched 10B or 11B. In comparison, we found that the isotope enhancement is considerably lower for phosphide arsenide as identical isotopic mass disorder becomes increasingly invisible to phonons. The ultrahigh conjunction its wide...
We report the fabrication of electrostatically defined nanostructures in encapsulated bilayer graphene, with leakage resistances below depletion gates as high R ∼ 10 GΩ. This exceeds previously reported values = 10-100 kΩ.1-3 attribute this improvement to use a graphite back gate. realize two split gate devices which define an electronic channel on scale Fermi-wavelength. A covering gap between varies charge carrier density channel. observe device-dependent conductance quantization ΔG 2e2/h...
A variety of crystals contain quasi-one-dimensional substructures, which yield distinctive electronic, spintronic, optical and thermoelectric properties. There is a lack understanding the lattice dynamics that influences properties such complex crystals. Here we employ inelastic neutron scatting measurements density functional theory calculations to show numerous low-energy vibrational modes exist in higher manganese silicides, an example These modes, including unusually low-frequency...
The development of cryogenic semiconductor electronics and superconducting quantum computing requires composite materials that can provide both thermal conduction insulation. We demonstrated at temperatures, the conductivity graphene composites be higher lower than reference pristine epoxy, depending on filler loading temperature. There exists a well-defined cross-over temperature-above it, increases with addition graphene; below decreases graphene. counter-intuitive trend was explained by...
Higher manganese silicides (HMS) made of earth‐abundant and non‐toxic elements are regarded as promising p‐type thermoelectric materials because their complex crystal structure results in low lattice thermal conductivity. It is shown here that the already conductivity HMS can be reduced further to approach minimum via partial substitution Mn with heavier rhenium (Re) increase point defect scattering. The solubility limit Re obtained x 1‐ Si 1.8 determined about = 0.18. Elemental...
The magnetic insulator yttrium iron garnet (YIG) with a ferrimagnetic transition temperature of $\sim$560 K has been widely used in microwave and spintronic devices. Anomalous features the spin Seeback effect (SSE) voltages have observed Pt/YIG attributed to magnon-phonon coupling. Here we use inelastic neutron scattering map out low-energy waves acoustic phonons YIG at 100 as function increasing field. By comparing zero 9.1 T data, find that instead splitting opening up gaps wave phonon...
Accurate determination of the intrinsic electronic structure thermoelectric materials is a prerequisite for utilizing an band engineering strategy to improve their performance. Herein, with high-resolution angle-resolved photoemission spectroscopy (ARPES), 3D half-Heusler material ZrNiSn revealed. An unexpectedly large bandgap directly observed by ARPES and further confirmed electrical optical measurements first-principles calculations. Moreover, anisotropic conduction factor 6 identified...
The effect of using metal foams in double-pipe heat exchangers is investigated this work. advantages and drawbacks these types exchanger are characterized quantified. analysis starts with an investigation forced convection foam-filled the Brinkman-Forchheimer-extended Darcy model Local Thermal Equilibrium (LTE) energy model. An excellent agreement displayed between present results established analytical results. presented work enables one to establish optimum conditions for use exchangers.
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Xi Chen, Annie Weathers, Daniel Salta, Libin Zhang, Jianshi Zhou, John B. Goodenough, Li Shi; Effects of (Al,Ge) double doping on the thermoelectric properties higher manganese silicides. Journal Applied Physics 7 November 2013; 114 (17): 173705. https://doi.org/10.1063/1.4828731 Download citation file: Ris...
Magnons are the energy quanta of fundamental spin excitations, namely waves, and they can make a considerable contribution to transport in some magnetic materials similar manner as lattice vibration waves or phonons. The coupling possible non-equilibrium between magnons other carriers have been used explain several recently discovered thermally driven conversion phenomena. Here, we report experiments which local phonons single crystalline bulk insulator, Y3Fe5O12 (yttrium iron garnet, YIG),...
A solid with larger sound speeds usually exhibits higher lattice thermal conductivity. Here, we report an exception that CuP2 has a quite large mean speed of 4155 m s-1, comparable to GaAs, but single crystals show very low conductivity about 4 W m-1 K-1 at room temperature, one order magnitude smaller than GaAs. To understand such puzzling transport behavior, have thoroughly investigated the atomic structures and dynamics by combining neutron scattering techniques first-principles...
Magnons are fundamental excitations of spin waves in magnetic materials, which able to carry both heat and information. Examining magnon thermal transport is essential for advancing energy-efficient spintronics novel energy conversion technologies. Unlike the well-established properties phonons electrons, size effect on remains elusive. Here, we quantitatively measure role grain nanostructured quantum magnet La2CuO4. Samples with controlled sizes synthesized using a bottom-up method. The...
Symmetric hierarchical PbTe superstructures, including hopper cubes, flower-like structures, and dendritic have been successfully fabricated by a facile alkaline hydrothermal method. Field emission scanning electron microscopy transmission observations show that the structures can be controlled changing reaction temperature, time, concentration of NaOH, kind surfactants. The formation mechanism was investigated on basis time-dependent experiment shape evolution. It is proposed cubic due to...
Semiconducting higher manganese silicides (HMS), with a nominal composition of MnSi1.73, are particularly promising thermoelectric materials because their elemental abundance, nontoxicity, and reported ZT around 0.4 at 800 K for undoped samples. However, embedded MnSi impurities naturally form during the melt growth HMS materials. The influences such occurring within bulk have yet to be carefully studied. Herein, we report synthesis high-purity MnSi-free single crystals by chemical vapor...
A rhenium-substituted HMS sample with small islands of MnSi secondary phase has been prepared by the quenching method. Such unique microstructure leads to an enhanced thermoelectric power factor (PF) as compared samples other methods.
The use of advanced thermal storage materials, such as phase change materials (PCMs), offers a practical approach to reducing energy consumption in buildings while maintaining comfortable indoor temperatures. This work employs EnergyPlus simulate the residential homes equipped with paraffin-based PCMs Southern California, region that experiences extremely high summer temperatures and significant day–night temperature variations. Two computational methods, basic method hysteresis method, are...
Abstract The electrocatalytic coupling of the nitrate reduction reaction (NO 3 − RR) and hydrazine oxidation (HzOR), denoted as NO RR||HzOR, not only holds promise for synthesis high‐value‐added products (such NH ) but also facilitates bidirectional nitrogen neutralization. Here, sponge‐like porous nitrogen‐doped carbon encapsulated Cu nanoparticles electrocatalysts is presented electrochemical RR||HzOR. Substituting traditional oxygen evolution (OER) with HzOR anode notably accelerates...