A5068864721- Advanced Thermoelectric Materials and Devices
- Rare-earth and actinide compounds
- Boron and Carbon Nanomaterials Research
- Chalcogenide Semiconductor Thin Films
- Thermal properties of materials
- Heusler alloys: electronic and magnetic properties
- Superconductivity in MgB2 and Alloys
- Electronic Packaging and Soldering Technologies
- Inorganic Chemistry and Materials
- Iron-based superconductors research
- Thermal Radiation and Cooling Technologies
- Thermal Expansion and Ionic Conductivity
- MXene and MAX Phase Materials
- Semiconductor materials and interfaces
- Intermetallics and Advanced Alloy Properties
- High-pressure geophysics and materials
- Magnetic and transport properties of perovskites and related materials
- 2D Materials and Applications
- Magnetic Properties of Alloys
- Cardiac Imaging and Diagnostics
- ZnO doping and properties
- Physics of Superconductivity and Magnetism
- Gas Sensing Nanomaterials and Sensors
- X-ray Diffraction in Crystallography
- Metallurgy and Material Forming
National Institute for Materials Science
2016-2025
University of Tsukuba
2016-2025
Toyama Prefectural University
2012-2025
Chuo University
2024
Chiba Institute of Technology
2024
University of Cambridge
2023
Japan Synchrotron Radiation Research Institute
2010-2023
Kyoto Institute of Technology
2023
Tokyo University of Science
1991-2023
SPring-8
2023
Thermoelectric harvesting of low-temperature waste heat offers great opportunities for sustainable energy production. However, the investigations related thermoelectric materials and modules remain sluggish. Here, we reported a advance in n-type Mg3Sb1.5Bi0.5 system by minor Cu additions. Some atoms preferentially occupy interstitial sites within Mg3Sb2 lattice significantly modified phonon modes via filling gap increased anharmonic scattering, thereby leading to anomalously low thermal...
Organic thermoelectric (TE) materials capitalize on advantages such as low thermal conductivity, low-cost, eco-friendly, versatile processability, light-weight, mechanical flexibility, roll-to-roll production, which are advantageous for the development of portable and wearable self-powered electronics. On negative side, figure-of-merit polymer TE is low, mainly owing to typical electrical conductivity. Various efforts have been made enhance performance organic materials, i.e. chemical or...
Increasing energy demands require new materials, e.g., thermoelectrics, for efficient conversion of fossil fuels. However, their low figure merit (ZT) limits widespread applications. Nanostructuring has been an effective way lowering the thermal conductivity. grain growth at elevated temperature is still a big concern, otherwise expected to be long-lasting thermoelectric generators. Here, we report porous architecture containing nano- micrometer size irregularly shaped and randomly oriented...
Although the thermoelectric effect was discovered around 200 years ago, main application in practice is cooling using traditional Bi2Te3. The related studies of new and efficient room-temperature materials modules have, however, not come to fruition yet. In this work, electronic properties n-type Mg3.2Bi1.5Sb0.5 material are maximized via delicate microstructural design with aim eliminating thermal grain boundary resistance, eventually leading a high zT above 1 over broad temperature range...
Increasing demand for higher energy efficiency calls waste heat recovery technology. Thus, facilitating practical thermoelectric generation systems is strongly desired. One option enhancing the power factor, S2/r, where S Seebeck coefficient and r electrical resistivity, although it still challenging because of trade-off between r. We demonstrate that enhanced S2/r can be achieved by incorporating magnetic interaction in ferromagnetic metals via spin fluctuation arising from itinerant...
GeTe alloy is a promising medium-temperature thermoelectric material but with highly intrinsic hole carrier concentration by thermodynamics, making this system to be intrinsically off-stoichiometric Ge vacancies and precipitations. Generally, an intentional increase of formation energy vacancy element substitution will lead effective dissolution precipitates for reduction in concentration. Here, opposite direction decreasing the demonstrated substituting Cr at site. This strategy produces...
Abstract GeTe is a promising mid-temperature thermoelectric compound but inevitably contains excessive Ge vacancies hindering its performance maximization. This work reveals that significant enhancement in the dimensionless figure of merit ( ZT ) could be realized by defect structure engineering from point defects to line and plane vacancies. The evolved including dislocations nanodomains enhance phonon scattering reduce lattice thermal conductivity GeTe. accumulation cationic toward...
The last decade created tremendous advances in new and unique thermoelectric generation materials, devices, fabrication techniques, technologies via various global research development. This article seeks to elucidate highlight some of these lay foundations for future work advances. New advanced methods demonstrations TE device material measurement, materials composition advances, design will be discussed. Other articles this Special Issue present additional into including multi-dimensional...
An effective thermoelectricity–freshwater cogenerator using solar energy and scavenging has been proposed as a promising solution to water scarcity electricity shortage.
Abstract This paper presents tables of key thermoelectric properties, which define conversion efficiency, for a wide range inorganic materials. The twelve families materials included in these are primarily selected on the basis well established, internationally-recognized performance and promise current future applications: tellurides, skutterudites, half Heuslers, Zintls, Mg–Sb antimonides, clathrates, FeGa 3 -type materials, actinides lanthanides, oxides, sulfides, selenides, silicides,...
Abstract Ambient energy harvesting has great potential to contribute sustainable development and address growing environmental challenges. Converting waste from energy-intensive processes systems (e.g. combustion engines furnaces) is crucial reducing their impact achieving net-zero emissions. Compact harvesters will also be key powering the exponentially smart devices ecosystem that part of Internet Things, thus enabling futuristic applications can improve our quality life homes, cities,...
By the fine manipulation of exceptional long-range germanium-telluride (Ge─Te) bonding through charge transfer engineering, we have achieved thermoelectric (TE) and mechanical properties in lead-free GeTe. This chemical mechanism along with a semiordered zigzag nanostructure generates notable increase average zT to record value ~1.73 temperature range 323 773 K ultrahigh maximum ~ 2.7. In addition, significantly enhanced Vickers microhardness numbers (Hv) an extraordinarily high 247 Hv...
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Idiopathic pulmonary fibrosis (IPF) risk-related factors were epidemiologically investigated on the basis of 1,311 Japanese IPF autopsy cases selected from annual complications data records in Japan during a 12-yr period. Age and sex distribution subjects revealed high peak their seventh decade with males predominating. The rate was more than two times higher (p < 0.01) among engaged occupations that exposed them to dust or organic solvents compared those other jobs. To ascertain job...
Percutaneous transvenous mitral commissurotomy was performed in 106 consecutive patients. Significant symptomatic improvement achieved 97 patients (92%). Mean left atrial pressure decreased (from 18 +/- 8 to 11 mm Hg, p less than 0.00001), mean diastolic gradient 12 7 6 and valve area increased 1.40 0.40 2.00 0.50 cm2, 0.00001). Based on echocardiographic characteristics of the apparatus, were grouped retrospectively three categories: pliable (group 1, n = 37), semipliable 2, 59), rigid 3,...
C-reactive protein (CRP), a predictor of cardiovascular events, localizes in atherosclerotic arteries and exerts proinflammatory effects on vascular cells. Reactive oxygen species (ROS) have been implicated atherogenesis plaque instability.Expressional pattern CRP directional coronary atherectomy specimens from 39 patients was examined. Characteristics histological instability higher levels serum fibrinogen were associated with the immunoreactivity. In situ hybridization revealed presence...
The chalcopyrite CuFeS2 is a natural magnetic semiconductor, where Fe spins order antiferromagnetically at TN = 853 K. We investigate the thermoelectric properties of carrier-doped alloys, Cu1-xFe1+xS2 with x 0.03 and 0.05, Zn0.03Cu0.97FeS2. All systems showed characteristic behavior n-type degenerate semiconductors. large Seebeck coefficient high carrier-density indicates enhanced carrier mass m* 3–6m0, m0 electron mass. Consequently, power factor exceeds 1×10-3 W K-2 m-1 400 propose that...
Current high-performance thermoelectric materials require elaborate doping and synthesis procedures, particularly in regard to the artificial structure, underlying mechanisms are still poorly understood. Here, we report that a natural chalcopyrite mineral, Cu1+x Fe1-x S2 , obtained from deep-sea hydrothermal vent can directly generate thermoelectricity. The resistivity displayed an excellent semiconducting character, large power high factor were found low x region. Notably, electron-magnon...
We demonstrate that Mn-doping to CuGaTe<sub>2</sub>leads a significantly enhanced<italic>ZT via</italic>the interaction between magnetic moments and carriers.