A5064263802- Advanced Thermoelectric Materials and Devices
- Thermodynamic and Structural Properties of Metals and Alloys
- Chalcogenide Semiconductor Thin Films
- Rare-earth and actinide compounds
- Semiconductor materials and interfaces
- Thermal Radiation and Cooling Technologies
- Thermal properties of materials
- Advanced Semiconductor Detectors and Materials
- Intermetallics and Advanced Alloy Properties
- Heusler alloys: electronic and magnetic properties
- Thermal Expansion and Ionic Conductivity
- Advanced Thermodynamics and Statistical Mechanics
- Advanced Thermodynamic Systems and Engines
- Spacecraft and Cryogenic Technologies
- Spacecraft Design and Technology
- Gas Sensing Nanomaterials and Sensors
- Magnetic and transport properties of perovskites and related materials
- Heat Transfer and Optimization
- Inorganic Chemistry and Materials
- Optical properties and cooling technologies in crystalline materials
- Semiconductor Quantum Structures and Devices
- Phase-change materials and chalcogenides
- nanoparticles nucleation surface interactions
- Chemical and Physical Properties of Materials
- Aerogels and thermal insulation
Jet Propulsion Laboratory
2013-2024
California Institute of Technology
2003-2014
Northwest University
2008
Michigan State University
2007
University of Michigan
2007
University of New Mexico
2004
Institute of Applied Physics
2000
Academy of Sciences of Moldova
2000
Stanford University
2000
Space Micro (United States)
1998
Efficient solid state energy conversion based on the Peltier effect for cooling and Seebeck power generation calls materials with high electrical conductivity σ, coefficient S, low thermal k. Identifying a thermoelectric figure of merit Z(= S2σ/k) has proven to be an extremely challenging task. After 30 years slow progress, research experienced resurgence, inspired by developments new concepts theories engineer electron phonon transport in both nanostructures bulk materials. This review...
A study of the thermoelectric properties skutterudite compound CoSb3 was carried out on single crystals grown by Bridgman gradient freeze technique. p- and n-type samples were obtained over a wide range carrier concentration. Undoped As-grown show p-type conductivity while addition Te or Pd. Samples characterized x-ray diffractometry, electron microprobe analysis, density measurements. The physical such as linear thermal expansion coefficient, sound velocity, Debye temperature also...
The solid-state transformation phenomena of spinodal decomposition and nucleation growth are presented as tools to create nanostructured thermoelectric materials with very low thermal conductivity greatly enhanced figure merit. systems (PbTe)(1-x)(PbS)(x) (Pb(0.95)Sn(0.05)Te)(1-x)(PbS)(x) not solid solutions but phase separate into PbTe-rich PbS-rich regions produce coherent nanoscale heterogeneities that severely depress the lattice conductivity. For x > approximately 0.03 ordered on three...
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...
Single crystals of the skutterudite ${\mathrm{CoSb}}_{3}$ exhibit large hole mobilities (up to 3000 ${\mathrm{cm}}^{2}$ ${\mathrm{V}}^{\mathrm{\ensuremath{-}}1}$ ${\mathrm{s}}^{\mathrm{\ensuremath{-}}1}$ at room temperature), intrinsic lattice thermal conductivity down 10 K, and pronounced phonon drag effects in thermoelectric power. The dependence mobility diffusion thermopower on density is consistent with recent band-structure calculations, which indicate that possesses a highly...
Co-nanostructuring of PbTe with two kinds metallic nanoparticles (Pb and Sb) can significantly increase its power factor at high temperatures (up to 87 % 700 K; see picture, ZT=figure merit). The electrical conductivity is dramatically increased without degrading the thermopower. This emergent synergy results only when both Pb Sb nanocrystals are present. Detailed facts importance specialist readers published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or...
Thermal conductivity, thermoelectric power, electrical resistivity, Hall coefficient, and magnetic susceptibility of the filled skutterudites ${\mathrm{CeFe}}_{4\mathrm{\ensuremath{-}}\mathrm{x}}$ ${\mathrm{Co}}_{\mathrm{x}}$ ${\mathrm{Sb}}_{12}$ , with x=0, 0.5, 1.0, 1.5, 2.0, have been studied from 2 to 300 K. We find that substitution Co at Fe sites has a dramatic effect on all transport properties. While resistivity ${\mathrm{CeFe}}_{4}$ metallic character, leads progressively stronger...
The operation of a Peltier cooler can be temporarily enhanced by utilizing the transient response current pulse. performance such device, using (Bi,Sb)2Te3-based thermoelectric elements, was examined from −70 to 55 °C. We establish both theoretically and experimentally essential parameters that describe pulse cooling effect, as minimum temperature achieved, maximum overshoot, time reach temperature, while cooled, between pulses. Using simple theoretical semiempirical relationships dependence...
Abstract Thermoelectric generators (TEGs) offer a versatile solution to convert low‐grade heat into useful electrical power. While reducing the length of active thermoelectric legs provides an efficient strategy increase maximum output power density p max , both high contact resistances and thermomechanical stresses are two central issues that have so far prevented strong reduction in volume materials integrated. Here, it is demonstrated these barriers can be lifted by using nonconventional...
Raman spectra of single-crystal CoSb3 and RhSb3 polycrystalline IrSb3 have been studied. We also studied four different polycrystalline-filled skutterudite samples, Ir4LaGe3Sb9, Ir4NdGe3Sb9, Ir4SmGe3Sb9, Fe4CeSb12, where rare-earth ions occupy the voids in structure. These void-filling interact with some lattice vibrations this structure produce a shift broadening observed lines. The most prominent lines all samples are Sb4 ring-breathing modes.
New thermoelectric materials with superior transport properties at high temperatures have been discovered. These are part of the large family skutterudites, a class compounds which shown good potential for applications. The composition these novel materials, called filled is derived from skutterudite crystal structure and can be represented by formula LnT/sub 4/Pn/sub 12/ (Ln=rare earth, Th; T=Fe, Rn, Os, Co, Rh, Ir; Pn=P, As, Sb). In compounds, empty octants formed in TPn/sub 3/ (/spl...
We have investigated the transport properties of solid solutions skutterudites based on $\mathrm{Co}{({\mathrm{Sb}}_{1\ensuremath{-}x}{\mathrm{As}}_{x})}_{3}$. Homogeneous were prepared with As content $x\ensuremath{\leqslant}0.1$. The influence point-defect scattering lattice thermal conductivity has been studied in detail. decreases increasing at all temperatures from...
A new skutterudite phase Ru0.5Pd0.5Sb3 was prepared. This adds to a large number of already known materials with the structure which have shown good potential for thermoelectric applications. Single phase, polycrystalline samples were prepared and characterized by x-ray analysis, electron probe microanalysis, density, sound velocity, thermal-expansion coefficient, differential thermal analysis measurements. has cubic lattice, space group Im3 (T5h), a=9.298 Å decomposes at about 920 K. The...
AbstractAbstractMany compounds with the spinel structure type have been analyzed for their thermoelectric properties. Published data was used to augment experimental results presented here and select promising spinels. Compounds studied include Cu0.5Al0.5Cr2Se4, Cu0.5Co0.5Cr2Se4, Cu0.5In0.5Cr2Se4, CuIr2Se4. Many exhibit low lattice thermal conductivity of about 20 mW/cmK, independent temperature. Two representative series GaxCu1-xCr2Se4 0≤x ≤0.6 CuxZn1-xCr2Se4 0≤x≤0.3 examine doping region...