A5057530376- Advanced Thermoelectric Materials and Devices
- Heusler alloys: electronic and magnetic properties
- Intermetallics and Advanced Alloy Properties
- Thermal properties of materials
- Magnetic and transport properties of perovskites and related materials
- Thermal Radiation and Cooling Technologies
- Advanced Condensed Matter Physics
- Thermal Expansion and Ionic Conductivity
- Physics of Superconductivity and Magnetism
- Gas Sensing Nanomaterials and Sensors
- Advanced Thermodynamics and Statistical Mechanics
- Ferroelectric and Piezoelectric Materials
- Perovskite Materials and Applications
- Multiferroics and related materials
- Phase Change Materials Research
- Heat Transfer and Optimization
- Dielectric properties of ceramics
- Metallurgical and Alloy Processes
- Solar Thermal and Photovoltaic Systems
- Advanced materials and composites
- Transition Metal Oxide Nanomaterials
- 2D Materials and Applications
- MXene and MAX Phase Materials
- Metal and Thin Film Mechanics
- Advanced Welding Techniques Analysis
National Institute of Advanced Industrial Science and Technology
2016-2025
National Center For Child Health and Development
2022-2023
Newcastle University
2017
Imperial College London
2017
Nanyang Technological University
2017
Hirosaki University
2017
Nagoya University
2012-2015
DMG Mori (Japan)
2013
Japan Science and Technology Agency
2003-2012
Nagoya Institute of Technology
2011
With a strong help of high-resolution photoemission spectroscopy we demonstrate in this paper that the large thermoelectric power observed layered cobalt oxides, such as ${\mathrm{Ca}}_{3}{\mathrm{Co}}_{4}{\mathrm{O}}_{9},$ ${\mathrm{Na}}_{0.6}{\mathrm{CoO}}_{2},$ and ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}{\mathrm{Co}}_{2}{\mathrm{O}}_{9},$ can be well accounted for with Boltzmann-type metallic electrical conduction. An intense peak 1.5--2 eV width was spectra its center at 1.0 below Fermi...
A Heusler Fe2V1-xWxAl sintered alloy was synthesized to evaluate the effect of W substitution on thermoelectric properties alloy. The Seebeck coefficient and electrical conductivity are simultaneously enhanced through electron injection resulting from substitution. Comparison with Si-substituted Fe2VAl reveals that additional electronic states derived 5d orbital in vicinity pseudogap likely degrade coefficient. Thermal is effectively reduced by because large atomic mass volume compared...
Using muon spin spectroscopy we have found that, for both ${\mathrm{N}\mathrm{a}}_{x}{\mathrm{C}\mathrm{o}\mathrm{O}}_{2}$ ($0.6\ensuremath{\le}x\ensuremath{\le}0.9$) and three- four-layer cobaltites, a common low temperature magnetic state (which in some cases is manifest as an incommensurate density wave) forms the ${\mathrm{C}\mathrm{o}\mathrm{O}}_{2}$ planes. Here summarize those results report almost dome-shaped relation between transition into low-$T$ composition $x$ and/or...
Different versions of a thermoelectric unicouple composed p-type Ca2.7Bi0.3Co4O9 (Co-349) and n-type La0.9Bi0.1NiO3 (Ni-113) bulks were constructed using Ag paste containing p- oxide powders, prepared from the same bulks, for connection p n legs, respectively. Internal resistance (RI) corrected 6 wt. % powders is 26.2mΩ at 1073K in air decreases with increasing temperature. Maximum output power (Pmax), evaluated formula Pmax=VO2∕4RI, (VO open-circuit voltage), 94mW (ΔT=500K) increases This...
High power density is a strong point of thermoelectric generation. Exploitation this salient characteristic would make modules promising candidates for mobile applications. Here we show how can be generated using small module composed 140 pairs oxide unicouples. The weighs 19.8g and its dimensions are 53mm long, 32mm wide, 5.0mm thick. hot-pressed bulk materials used were connected with Ag paste, incorporating powder, electrodes. module’s open circuit voltage increases increasing hot-side...
Abstract Half-Heusler compound has drawn attention in a variety of fields as candidate material for thermoelectric energy conversion and spintronics technology. When the half-Heusler is incorporated into device, control high lattice thermal conductivity owing to crystal symmetry challenge manager device. The calculation prediction an important physical parameter controlling management We examined whether by machine learning was possible on basis only atomic information constituent elements...
We measured the high-temperature thermoelectric properties of single-crystal Ca3Co2O6, which consists parallel one-dimensional Co2O66− chains separated by Ca2+ ions. The resistivity (ρ) along c-axis decreases rapidly upon increasing temperature from 2×104 to 8 mΩ cm in a region 300 1073 K. Seebeck coefficient (S) is positive and 230 160 μV/K at 373 K, respectively. thermal conductivity (κ) as low W/mK room linearly with increase 4.6 773 Thus, estimated dimensionless figure-of-merit...
Nanoscale constituents in bulk materials can promote enhanced boundary-scattering the transport of phonons as well electrons, which is considered a key design factor for enhancing thermoelectric properties. Here, we demonstrate method synthesizing zinc oxide from nanoparticles without significant grain growth by means pressure-induced deformation at 200 °C. This allows us to comprehensively analyze size dependence properties nanoscale range above 30 nm, nanoparticle. Grain was found largely...
The correlation between thermoelectric properties and texture strength is discussed within the framework of Ca3Co4O9 textured ceramics. Based on an innovative method x-ray diffraction analysis, distribution density (i.e., degree orientation) composite material composed powder single crystals was determined. Electrical resistivity prepared composites shown to be reduced with increasing weight ratios and, in parallel, directly correlated improvement grain alignment. incorporated help...
We fabricated thin-film thermoelectric modules for thermal–photovoltaic hybrid solar generator. Bi0.5Sb1.5Te3 (p-type) and Bi2Te2.7Se0.3 (n-type) thin films were deposited by radio-frequency magnetron sputtering method patterned to form plane-type using lift-off technique. The module consisted of the module, a photovoltaic hot mirror, near-infrared (NIR) focusing lens. NIR light, which does not contribute conversion, was separated from light mirror. When focused onto side lens, open voltage...
Thermoelectric energy conversion technology has attracted attention as an harvesting that converts waste heat into electricity by means of the Seebeck effect. Oxide-based thermoelectric materials show a high figure merit are promising because their good chemical and thermal stability well harmless nature compared to chalcogenide-based state-of-the-art materials. Although several high-ZT oxides (ZT > 1) have been reported thus far, reliability is low due lack careful observation at elevated...
We grew single crystals of partially Bi-substituted Ca3Co4O9 phase in a solution consisting K2CO3–KCl solvent. All the X-ray diffraction patterns with different Bi contents were attributable to structure, although weak peaks from secondary Bi2Ca2Co2Ox observed grown starting composition molar ratio Ca:Bi:Co=2.5:0.5:4.0 (BC-0.5 crystal). Thermoelectric properties ab-plane measured at various temperatures. Seebeck coefficient (S) was increased by partial Bi-substitution room temperature,...
A thermoelectric module was constructed using p-type Fe2V0.9Ti0.1Al and n-type Fe2VAl0.9Si0.1 sintered alloys prepared by pulse-current sintering (PCS). The power factors of the p- materials were 1.6 4.1 mW/mK2, respectively, at 350 K. bending fracture strength alloy 800 MPa 10 times higher than that Bi–Te alloy. These connected in series with a copper electrode. connection induced Joule heating high pressure without electrically conductive jointing materials, such as solder Ag paste. shear...