High figure of merit ZT in PbTe and Bi/sub 2/Te/sub 3/ based superlattice structures by thermal conductivity reduction

2002 ◽  
Author(s):  
A. Lambrecht ◽  
H. Beyer ◽  
J. Nurnus ◽  
C. Kunzel ◽  
H. Bottner
Keyword(s):  
Thermal Conductivity ◽  
Figure Of Merit ◽  
High Figure ◽  
Superlattice Structures

Thermal Conductivity Reduction of SiGe Nanocomposites

2003 ◽  
Vol 793 ◽  
Author(s):  
T. Harris ◽  
H. Lee ◽  
D. Z. Wang ◽  
J. Y. Huang ◽  
Z. F. Ren ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Figure Of Merit ◽  
Room Temperature ◽  
Thermoelectric Figure Of Merit ◽  
Thermoelectric Figure ◽  
Si Nanoparticles ◽  
High Figure ◽  
Superlattice Structures ◽  
Bulk Alloys ◽  
Nanoscale Physics

ABSTRACTHigh figure of merit has been reported in superlattice structures in recent years mainly due to a large reduction in thermal conductivity, while maintaining or even enhancing the power factor. These findings suggest the possibility of using nanocomposites to reduce a material's thermal conductivity and thereby increasing the thermoelectric figure of merit. The current work reports on the thermal conductivity of various Si-Ge nanocomposites synthesized in a simple and straightforward process that allows one to exploit nanoscale physics while rapidly producing macroscale devices. Composite synthesis consisted of combining Si nanoparticles approximately 70 nm in diameter with micron-sized Ge particles in various atomic ratios via hotpressing to form macroscale samples. Room-temperature thermal conductivity was measured for each of the nanocomposite samples and compared with the values of SiGe bulk alloys. In this preliminary work, we observed a significant reduction in bulk thermal conductivity in such materials.

Low lattice thermal conductivity and high figure of merit in p-type doped K3IO

2020 ◽  
Vol 29 (12) ◽  
pp. 126501
Author(s):  
Weiqiang Wang ◽  
Zhenhong Dai ◽  
Qi Zhong ◽  
Yinchang Zhao ◽  
Sheng Meng
Keyword(s):  
Thermal Conductivity ◽  
Figure Of Merit ◽  
Lattice Thermal Conductivity ◽  
High Figure ◽  
P Type

Low thermal conductivity and high figure of merit for rapidly synthesized n-type Pb1−xBixTe alloys

2018 ◽  
Vol 47 (44) ◽  
pp. 15957-15966 ◽  
Author(s):  
Tingting Chen ◽  
Hongchao Wang ◽  
Wenbin Su ◽  
Fahad Mehmood ◽  
Teng Wang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Low Temperature ◽  
Figure Of Merit ◽  
Low Thermal Conductivity ◽  
High Figure

High zTs of Pb1−xBixTe alloys rapidly synthesized at low temperature in this study are comparable to those from conventional melting synthesis.

Reductions in the Lattice Thermal Conductivity of Ball-milled and Shock compacted TiNiSn1−XSbX Half-Heusler alloys

2001 ◽  
Vol 691 ◽  
Author(s):  
S. Bhattacharya ◽  
Y. Xia ◽  
V. Ponnambalam ◽  
S.J. Poon ◽  
N. Thadani ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Electrical Resistivity ◽  
Figure Of Merit ◽  
Room Temperature ◽  
Lattice Thermal Conductivity ◽  
Heusler Alloys ◽  
Lattice Contribution ◽  
Grain Sizes ◽  
Shock Compaction ◽  
High Figure

ABSTRACTHalf-Heusler alloys are currently being investigated for their potential as thermoelectric materials [1], [2]. They exhibit high negative thermopower (40-250μV/K) and favorable electrical resistivity (0.1-8mW•cm) at room temperature. Attractive power factors (α2σT) of about (0.2-1.0W/m•K) at room temperature and about 4W/m•K at 600K [3] have been reported in these materials. But in order to achieve a high figure-of-merit in the half-Heusler alloys, the relatively high thermal conductivity in these materials (∼ 10 W/m•K) must be reduced. The thermal conductivity in these materials is composed of mainly a lattice contribution, compared to a very small electronic component. The challenge is to reduce the relatively high lattice thermal conductivity in these materials. Reported in this paper is a significant reduction of lattice thermal conductivity (∼1.5 - 3.5W/m•K) in some Ti-based half-Heusler alloys. Samples have been prepared by ball milling and followed by shock-compaction that has resulted into reduced grain sizes in these materials. The effects of the microstructure on the thermal transport properties of the Half-Heusler alloys have been investigated and are presented and discussed herein.

High figure of merit of monolayer Sb2Te2Se of ultra low lattice thermal conductivity

2020 ◽  
Vol 177 ◽  
pp. 109588 ◽  
Author(s):  
Bin Xu ◽  
Qiong Xia ◽  
Jing Zhang ◽  
Shanshan Ma ◽  
Yusheng Wang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Figure Of Merit ◽  
Lattice Thermal Conductivity ◽  
High Figure

High thermoelectric performance of superionic argyrodite compound Ag8SnSe6

2016 ◽  
Vol 4 (24) ◽  
pp. 5806-5813 ◽  
Author(s):  
Lin Li ◽  
Yuan Liu ◽  
Jiyan Dai ◽  
Aijun Hong ◽  
Min Zeng ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermoelectric Material ◽  
Power Factor ◽  
High Power ◽  
Figure Of Merit ◽  
Environmentally Friendly ◽  
Thermoelectric Performance ◽  
Low Thermal Conductivity ◽  
High Power Factor ◽  
High Figure

A good thermoelectric material usually has a high power factor and low thermal conductivity for high figure of merit (ZT), and is also environmentally friendly and economical.

Remarkable electron and phonon band structures lead to a high thermoelectric performance ZT > 1 in earth-abundant and eco-friendly SnS crystals

2018 ◽  
Vol 6 (21) ◽  
pp. 10048-10056 ◽  
Author(s):  
Wenke He ◽  
Dongyang Wang ◽  
Jin-Feng Dong ◽  
Yang Qiu ◽  
Liangwei Fu ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Transport Properties ◽  
Electrical Transport ◽  
Figure Of Merit ◽  
Thermoelectric Performance ◽  
Electrical Transport Properties ◽  
Band Structures ◽  
Low Thermal Conductivity ◽  
Earth Abundant ◽  
High Figure

Enhanced electrical transport properties and low thermal conductivity lead to high figure of merit (ZT) over the whole temperature range in Na-doped SnS crystals.

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