Ag9TlTe5: A high-performance thermoelectric bulk material with extremely low thermal conductivity

2005 ◽  
Vol 87 (6) ◽  
pp. 061919 ◽  
Author(s):  
Ken Kurosaki ◽  
Atsuko Kosuga ◽  
Hiroaki Muta ◽  
Masayoshi Uno ◽  
Shinsuke Yamanaka
Keyword(s):  
Thermal Conductivity ◽  
High Performance ◽  
Bulk Material ◽  
Low Thermal Conductivity

Thermoelectric Properties of Phase Separated Composite of Ln-Doped SrTiO3 and TiO2 Micro Crystals

2007 ◽  
Vol 1044 ◽  
Author(s):  
Kiyoshi Fuda ◽  
Kenji Murakami ◽  
Shigeaki Sugiyama
Keyword(s):  
Thermal Conductivity ◽  
High Performance ◽  
Fine Particles ◽  
Bulk Material ◽  
Laser Flash ◽  
Flash Method ◽  
Helium Atmosphere ◽  
Low Thermal Conductivity ◽  
Seebeck Coefficients ◽  
Thermal Diffusivities

AbstractIt seems that no satisfactory TE property has been found in n-type oxide bulk materials even though Al-doped ZnO and La-doped SrTiO3 have high thermoelectric (TE) responses. Difficulty in developing high-performance TE materials seems to lie in finding low thermal conductivity in such oxides. The purpose of this study is to find a possibility to make an n-type TE oxide bulk material having low thermal conductivity and excellent TE properties as well. For this purpose, we fabricated and examined a series of composites constructed of TiO2 and Ln-doped SrTiO3 fine crystals. The composites were prepared via two processing steps: (1) precursor oxide preparation by wet processes; (2) sintering by using spark plasma sintering (SPS) apparatus. The microscopic structure was examined by using scanning electron microscope (SEM; HITACHI S-4500 model) attached with an energy dispersive x-ray spectroscopy. The electrical conductivities and the Seebeck coefficients were measured simultaneously using an ULVAC ZEM-1 instrument in helium atmosphere. The thermal diffusivities were measured by a laser flash method in vacuum. The composites obtained here were found to commonly have a mosaic type texture constructed of TiO2 and SrTiO3 fine particles with a typical size of 500 nm. The thermal conductivity values measured for three samples with different contents are ranged between 3 and 4 Wm-1K-1 in the temperature range from room temperature to 800 C. The values are apparently lower than the value for single crystal SrTiO3 samples presented in literature. Taking account the other TE data, e.g. Seebeck coefficient and electrical conductivity, we calculated dimensionless figure of merit, ZT, to be at maximum 0.15 at 800°C.

Thallium-Free Thermoelectric Materials with Extremely Low Thermal Conductivity

2007 ◽  
Vol 1044 ◽  
Author(s):  
Shinsuke Yamanaka ◽  
Ken Kurosaki ◽  
Anek Charoenphakdee ◽  
Hideaki Mastumoto ◽  
Hiroaki Muta
Keyword(s):  
Thermal Conductivity ◽  
Thermoelectric Properties ◽  
Thermoelectric Materials ◽  
High Performance ◽  
Next Generation ◽  
Practical Application ◽  
Low Thermal Conductivity ◽  
New Class ◽  
Thallium Compounds ◽  
Thallium Tellurides

AbstractWith the goal of developing high-performance bulk thermoelectric materials, we have characterized ternary silver thallium tellurides. The ternary silver thallium tellurides exhibit extremely low thermal conductivity (<0.5 Wm−1K−1) and consequently their thermoelectric performance is excellent. Although the extremely low thermal conductivity materials, as typified by the ternary silver thallium tellurides, would be a new class of next-generation thermoelectric materials, thallium compounds are unsuitable for practical application because of their toxicity. Against such a background, we are currently exploring thallium-free thermoelectric materials with extremely low thermal conductivity. In this paper, we will briefly summarize the thermoelectric properties of ternary thallium tellurides obtained in our group. Further experiments aimed at improving the ZT of these materials will be presented. Finally, we will propose two candidates: Ag8GeTe6 and Ga2Te3 as thallium-free low thermal conductivity materials.

High-performance electron-doped GeMnTe2: hierarchical structure and low thermal conductivity

2019 ◽  
Vol 7 (48) ◽  
pp. 27361-27366 ◽  
Author(s):  
Jinfeng Dong ◽  
Jun Pei ◽  
Hua-Lu Zhuang ◽  
Haihua Hu ◽  
Bowen Cai ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Hierarchical Structure ◽  
High Performance ◽  
Thermoelectric Performance ◽  
Low Thermal Conductivity

All scale hierarchical structure induced low thermal conductivity promises high thermoelectric performance of electron doped GeMnTe2.

High Performance ThermoelectricTl9BiTe6with an Extremely Low Thermal Conductivity

2001 ◽  
Vol 86 (19) ◽  
pp. 4350-4353 ◽  
Author(s):  
Bernd Wölfing ◽  
Christian Kloc ◽  
Jens Teubner ◽  
Ernst Bucher
Keyword(s):  
Thermal Conductivity ◽  
High Performance ◽  
Low Thermal Conductivity

Application of ultra-high performance concrete for thermal resistance materials

2019 ◽  
Author(s):  
Sung-Gul Hong ◽  
Namhee K. Hong ◽  
In-Young Gu
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Thermal Resistance ◽  
High Performance ◽  
High Performance Concrete ◽  
Curing Temperature ◽  
Core Material ◽  
Ultra High Performance Concrete ◽  
External Temperature ◽  
Low Thermal Conductivity

<p>This paper investigates the thermal resistance of ultra-high performance concrete (UHPC) composites using different fillers of low thermal conductivity. The development of new concrete for energy saving facilities is more demanding for climate change threat to human. The use of UHPC composite with expanded polystyrene (EPS) beads as well as different fillers of low thermal conductivity has shown a viable option of architectural sandwich walls of insulation. The optimum fillers of thermal resistance for UHPC are determined by the tradeoff of compressive strength between heat conductivity. Better thermal properties of some UHPC composites make lower compressive strength of UHPC. To evaluate the varying thermal and mechanical characteristics of UHPC composites with the quantity of fillers, the method of volumetric substitution for UHPC was investigated in this paper. The UHPC composite of thermal resistance with comparable compressive strength can be possibly used for concrete blocks to transfer flexural compression force in efficient thermal breaker systems. Test results show that the strength of the concrete is greatly influenced by the curing method and the most important factors affecting the strength of concrete are curing temperature and curing time. Structural UHPC walls of thermal resistance serve as both load transfer and barrier to external temperature. To investigate the mechanical behavior of composite sandwich panels, the panels for the study are fabricated by new concrete as core and face sheets and the influence of the three components – the mechanical properties of the core material, the strength of the face sheet material, and the bond strength adhesive material – was evaluated. The flexural capacity of the specimens UHPC with EPS core showed high strength in a stable linear behavior before core cracking.</p>

Understanding of the Extremely Low Thermal Conductivity in High-Performance Polycrystalline SnSe through Potassium Doping

2016 ◽  
Vol 26 (37) ◽  
pp. 6836-6845 ◽  
Author(s):  
Yue-Xing Chen ◽  
Zhen-Hua Ge ◽  
Meijie Yin ◽  
Dan Feng ◽  
Xue-Qin Huang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
High Performance ◽  
Low Thermal Conductivity

Thermoelectric Properties of Zinc-Doped Cu5Sn2Se7 and Cu5Sn2Te7

2021 ◽  
Author(s):  
Cheryl Sturm ◽  
Leilane R. Macario ◽  
Takao Mori ◽  
Holger Kleinke
Keyword(s):  
Thermal Conductivity ◽  
Thermoelectric Properties ◽  
Thermoelectric Materials ◽  
High Performance ◽  
Waste Heat ◽  
Low Thermal Conductivity ◽  
Copper Chalcogenides

High-performance thermoelectric materials are currently being sought after to recycle waste heat. Copper chalcogenides in general are materials of great interest because of their naturally low thermal conductivity and readily...

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