scholarly journals Lead-free SnTe-based thermoelectrics: enhancement of thermoelectric performance by doping with Gd/Ag

2016 ◽  
Vol 4 (20) ◽  
pp. 7936-7942 ◽  
Author(s):  
Lijuan Zhang ◽  
Jianli Wang ◽  
Zhenxiang Cheng ◽  
Qiao Sun ◽  
Zhen Li ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Seebeck Coefficient ◽  
Thermoelectric Materials ◽  
Lattice Thermal Conductivity ◽  
Lead Free ◽  
Thermoelectric Performance ◽  
Co Doping

Gd/Ag co-doping is an effective way to simultaneously reduce the lattice thermal conductivity and enhance the Seebeck coefficient of SnTe-based thermoelectric materials.

Investigation of Thermoelectric Materials: Substitution effect of Bi on the Ag1-xPb18MTe20 (M = Sb, Bi) (x = 0, 0.14, 0.3)

2007 ◽  
Vol 1044 ◽  
Author(s):  
Mi-kyung Han ◽  
Huijun Kong ◽  
Ctirad Uher ◽  
Mercouri G Kanatzidis
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Seebeck Coefficient ◽  
Thermoelectric Materials ◽  
Figure Of Merit ◽  
Lattice Thermal Conductivity ◽  
Substitution Effect ◽  
Dimensionless Figure Of Merit ◽  
The Matrix ◽  
Mass Fluctuation

AbstractWe performed comparative investigations of the Ag1-xPb18MTe20 (M = Bi, Sb) (x = 0, 0.14, 0.3) system to better understand the roles of Sb and Bi on the thermoelectric properties. In both systems, the electrical conductivity nearly keeps the same values, while the Seebeck coefficient decreases dramatically in going from Sb to Bi. Compared to the lattice thermal conductivity of PbTe, that of AgPb18BiTe20 is substantially reduced. The lattice thermal conductivity of the Bi analog, however, is higher than that of AgPb18SbTe20 and this is attributed largely to the decrease in the degree of mass fluctuation between the nanostructures and the matrix (for the Bi analog). As a result the dimensionless figure of merit ZT of Ag1-xPb18MTe20 (M = Bi) is found to be smaller than that of Ag1-xPb18MTe20 (M = Sb).

Thermoelectric Performance of Glass Microsphere Dispersed Bi-Sb Composites at Low Temperature

2013 ◽  
Vol 743-744 ◽  
pp. 120-125
Author(s):  
Zhen Chen ◽  
Ye Mao Han ◽  
Min Zhou ◽  
Rong Jin Huang ◽  
Yuan Zhou ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Seebeck Coefficient ◽  
Thermoelectric Materials ◽  
Sem Analysis ◽  
Glass Microsphere ◽  
Thermoelectric Performance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Measurement Results

In the present study, the glass microsphere dispersed Bi-Sb thermoelectric materials have been fabricated through mechanical alloying followed by pressureless sintering. The phase composition and the microstructure were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis. Electrical conductivity, Seebeck coefficient and thermal conductivity were measured in the temperature range of 77~300 K. The ZT values were calculated according to the measurement results. The results showed that the electrical conductivity, Seebeck coefficient and thermal conductivity decreased by adding glass microsphere into Bi-Sb thermoelectric materials. However, the optimum ZT value of 0.24 was obtained at 260 K, which was increased 10% than that of the Bi-Sb matrix. So it is confirmed that the thermoelectric performance of Bi-Sb-based materials can be improved by adding moderate glass microspheres.

Construction of a 3D-rGO network-wrapping architecture in a YbyCo4Sb12/rGO composite for enhancing the thermoelectric performance

2015 ◽  
Vol 3 (16) ◽  
pp. 8643-8649 ◽  
Author(s):  
Peng-an Zong ◽  
Xihong Chen ◽  
Yanwu Zhu ◽  
Ziwei Liu ◽  
Yi Zeng ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Seebeck Coefficient ◽  
Network Architecture ◽  
Lattice Thermal Conductivity ◽  
Thermoelectric Performance

The construction of a 3D-rGO network architecture dramatically reduced the lattice thermal conductivity and simultaneously enhanced the Seebeck coefficient, leading to a maximum ZT of 1.51.

scholarly journals Achieving High Thermoelectric Performance in Rare-Earth Element-Free CaMg2Bi2 with High Carrier Mobility and Ultralow Lattice Thermal Conductivity

Research ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-10 ◽  
Author(s):  
Muchun Guo ◽  
Fengkai Guo ◽  
Jianbo Zhu ◽  
Li Yin ◽  
Qian Zhang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermoelectric Materials ◽  
Carrier Mobility ◽  
Lattice Thermal Conductivity ◽  
Low Cost ◽  
Thermoelectric Performance ◽  
Widespread Application ◽  
Compatibility Factor ◽  
High Carrier Mobility ◽  
High Carrier

CaMg2Bi2-based compounds, a kind of the representative compounds of Zintl phases, have uniquely inherent layered structure and hence are considered to be potential thermoelectric materials. Generally, alloying is a traditional and effective way to reduce the lattice thermal conductivity through the mass and strain field fluctuation between host and guest atoms. The cation sites have very few contributions to the band structure around the fermi level; thus, cation substitution may have negligible influence on the electric transport properties. What is more, widespread application of thermoelectric materials not only desires high ZT value but also calls for low-cost and environmentally benign constituent elements. Here, Ba substitution on cation site achieves a sharp reduction in lattice thermal conductivity through enhanced point defects scattering without the obvious sacrifice of high carrier mobility, and thus improves thermoelectric properties. Then, by combining further enhanced phonon scattering caused by isoelectronic substitution of Zn on the Mg site, an extraordinarily low lattice thermal conductivity of 0.51 W m-1 K-1 at 873 K is achieved in (Ca0.75Ba0.25)0.995Na0.005Mg1.95Zn0.05Bi1.98 alloy, approaching the amorphous limit. Such maintenance of high mobility and realization of ultralow lattice thermal conductivity synergistically result in broadly improvement of the quality factor β. Finally, a maximum ZT of 1.25 at 873 K and the corresponding ZTave up to 0.85 from 300 K to 873 K have been obtained for the same composition, meanwhile possessing temperature independent compatibility factor. To our knowledge, the current ZTave exceeds all the reported values in AMg2Bi2-based compounds so far. Furthermore, the low-cost and environment-friendly characteristic plus excellent thermoelectric performance also make the present Zintl phase CaMg2Bi2 more competitive in practical application.

Thermoelectric Performance of ZrNX (X = Cl, Br, I) Monolayers

2021 ◽  
Author(s):  
Wenwu Shi ◽  
Nina Ge ◽  
Xinzhong Wang ◽  
Zhiguo Wang
Keyword(s):  
Thermal Conductivity ◽  
Power Factor ◽  
High Power ◽  
Thermoelectric Materials ◽  
Lattice Thermal Conductivity ◽  
Thermoelectric Performance ◽  
Low Thermal Conductivity ◽  
High Power Factor

Low thermal conductivity and high power factor are essential for the efficient thermoelectric materials. The lattice thermal conductivity can be reduced by reducing the dimension of materials, thus improving the...

scholarly journals Cu8GeSe6-based thermoelectric materials with an argyrodite structure

2017 ◽  
Vol 5 (4) ◽  
pp. 943-952 ◽  
Author(s):  
Binbin Jiang ◽  
Pengfei Qiu ◽  
Espen Eikeland ◽  
Hongyi Chen ◽  
Qingfeng Song ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermoelectric Material ◽  
Thermoelectric Materials ◽  
Lattice Thermal Conductivity ◽  
Thermoelectric Performance ◽  
Type Compound

Cu8GeSe6 argyrodite-type compound is a new thermoelectric material which exhibits extremely low lattice thermal conductivity and high thermoelectric performance.

Efficient lanthanide Gd Doping Promoting Thermoelectric Performance of Mg3Sb2-based Materials

2021 ◽  
Author(s):  
Jingdan Lei ◽  
Hexige Wuliji ◽  
Kunpeng Zhao ◽  
Tian-Ran Wei ◽  
Qing Xu ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermoelectric Materials ◽  
Carrier Mobility ◽  
Lattice Thermal Conductivity ◽  
Thermoelectric Performance ◽  
High Carrier Mobility ◽  
High Carrier ◽  
High Band

Mg3Sb2-based thermoelectric materials have recently received heightened attentions due to its diverse merits of high band degeneracy, ultralow lattice thermal conductivity and high carrier mobility. However, the inherently low carrier...

scholarly journals The origin of the lattice thermal conductivity enhancement at the ferroelectric phase transition in GeTe

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Đorđe Dangić ◽  
Olle Hellman ◽  
Stephen Fahy ◽  
Ivana Savić
Keyword(s):  
Phase Transition ◽  
Thermal Conductivity ◽  
Phase Transitions ◽  
Thermoelectric Materials ◽  
Ferroelectric Phase Transition ◽  
Lattice Thermal Conductivity ◽  
Ferroelectric Phase ◽  
Structural Phase ◽  
High Symmetry ◽  
Structural Phase Transitions

AbstractThe proximity to structural phase transitions in IV-VI thermoelectric materials is one of the main reasons for their large phonon anharmonicity and intrinsically low lattice thermal conductivity κ. However, the κ of GeTe increases at the ferroelectric phase transition near 700 K. Using first-principles calculations with the temperature dependent effective potential method, we show that this rise in κ is the consequence of negative thermal expansion in the rhombohedral phase and increase in the phonon lifetimes in the high-symmetry phase. Strong anharmonicity near the phase transition induces non-Lorentzian shapes of the phonon power spectra. To account for these effects, we implement a method of calculating κ based on the Green-Kubo approach and find that the Boltzmann transport equation underestimates κ near the phase transition. Our findings elucidate the influence of structural phase transitions on κ and provide guidance for design of better thermoelectric materials.

scholarly journals A Material Catalogue with Glass-Like Thermal Conductivity Mediated by the Crystallographic Occupancy for Thermoelectric Application

2021 ◽  
Author(s):  
Zihang Liu ◽  
Wenhao Zhang ◽  
Weihong Gao ◽  
Takao Mori
Keyword(s):  
Thermal Conductivity ◽  
Lattice Thermal Conductivity ◽  
Thermoelectric Performance ◽  
Synthetic Approach ◽  
Thermoelectric Application

Discovering materials with the intrinsically low lattice thermal conductivity κlat is an important route for achieving high thermoelectric performance. In reality, the conventional synthetic approach, however, relies on trial and...

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