scholarly journals Limitations of zT as a figure of merit for nanostructured thermoelectric materials

2019 ◽  
Vol 126 (19) ◽  
pp. 195703 ◽  
Author(s):  
Xufeng Wang ◽  
Mark Lundstrom
Keyword(s):  
Thermoelectric Materials ◽  
Figure Of Merit ◽  
Nanostructured Thermoelectric Materials

In-situ TEM Study of Bismuth Nanostructures

2007 ◽  
Vol 1044 ◽  
Author(s):  
Xiaoting Jia ◽  
Vincent Berube ◽  
Shuo Chen ◽  
Bed Poudel ◽  
Son Hyungbin ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Thermoelectric Materials ◽  
Figure Of Merit ◽  
Structural Behavior ◽  
In Situ Tem ◽  
Electrical Measurements ◽  
Dimensionless Figure Of Merit ◽  
Bi Nanoparticles ◽  
Nanostructured Thermoelectric Materials

AbstractNanostructured thermoelectric materials have attracted lots of interest in recent years, due to their enhanced performance determined by their thermoelectric dimensionless figure of merit. However, because of equipment limitations, not much work has been done on combining simultaneous transport measurements and structural characterization on individual nanostructured thermoelectric materials. With an integrated TEM-STM system, we studied the structural behavior and electrical properties of bismuth (Bi) nanobelts and nanoparticles. Results showed that clean Bi nanostructures free of oxides can be produced by in-situ high temperature electro-migration and Joule annealing processes occurring within the electron microscope. Preliminary electrical measurements indicate a conductivity of two orders of magnitude lower for Bi nanoparticles than that for bulk Bi. Such in-situ studies are highly advantageous for studying the semimetal-semiconductor transition and how this transition could enhance thermoelectric properties.

Theoretical and experimental advances in Bi2Te3 / Sb2Te3 - based and related superlattice systems

2013 ◽  
Vol 1490 ◽  
pp. 205-222 ◽  
Author(s):  
M. Winkler ◽  
X. Liu ◽  
U. Schürmann ◽  
J. D. König ◽  
L. Kienle ◽  
...  
Keyword(s):  
Thin Film ◽  
Transport Properties ◽  
Thermoelectric Materials ◽  
Figure Of Merit ◽  
Theoretical Models ◽  
Review Article ◽  
Experimental Results ◽  
Thermoelectric Figure Of Merit ◽  
Thermoelectric Figure ◽  
Nanostructured Thermoelectric Materials

ABSTRACTRoughly a decade ago an outstanding thermoelectric figure of merit ZT of 2.4 was reported for nanostructured Bi2Te3/Sb2Te3-based thin film superlattice (SL) structures. The published results strongly fueled and renewed the interest in the development of efficient novel nanostructured thermoelectric materials. This review article shall give an overview over the most recent theoretical and experimental advances on Bi2Te3/Sb2Te3 SLs and related superlattice systems. The presented theoretical models are subdivided into electronic and phononic aspects. The experimental results are summarized with regard to the method used. A more detailed elaboration on structural and transport properties is given in the subsequent sections.

Energy Challenges and Optimization of Figure of Merit for Thermoelectric Materials

2014 ◽  
Vol 03 (10) ◽  
pp. 16475-16479
Author(s):  
ASHAQ HUSSAIN SOFI ◽  
BAASIT ABUBAKR ◽  
ANIL MAINI ◽  
MOHAMMAD ASHRAF SHAH
Keyword(s):  
Thermoelectric Materials ◽  
Figure Of Merit

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).

scholarly journals Thermoelectric Materials for Textile Applications

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3154
Author(s):  
Kony Chatterjee ◽  
Tushar K. Ghosh
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Seebeck Coefficient ◽  
Thermoelectric Materials ◽  
Figure Of Merit ◽  
Inorganic Materials ◽  
Peltier Effect ◽  
Electronic Textiles ◽  
Heating And Cooling ◽  
Recent Attention

Since prehistoric times, textiles have served an important role–providing necessary protection and comfort. Recently, the rise of electronic textiles (e-textiles) as part of the larger efforts to develop smart textiles, has paved the way for enhancing textile functionalities including sensing, energy harvesting, and active heating and cooling. Recent attention has focused on the integration of thermoelectric (TE) functionalities into textiles—making fabrics capable of either converting body heating into electricity (Seebeck effect) or conversely using electricity to provide next-to-skin heating/cooling (Peltier effect). Various TE materials have been explored, classified broadly into (i) inorganic, (ii) organic, and (iii) hybrid organic-inorganic. TE figure-of-merit (ZT) is commonly used to correlate Seebeck coefficient, electrical and thermal conductivity. For textiles, it is important to think of appropriate materials not just in terms of ZT, but also whether they are flexible, conformable, and easily processable. Commercial TEs usually compromise rigid, sometimes toxic, inorganic materials such as bismuth and lead. For textiles, organic and hybrid TE materials are more appropriate. Carbon-based TE materials have been especially attractive since graphene and carbon nanotubes have excellent transport properties with easy modifications to create TE materials with high ZT and textile compatibility. This review focuses on flexible TE materials and their integration into textiles.

Thermoelectric Properties of n-Type 90% Bi2Te3+10%Bi2Se3 Thermoelectric Materials Produced by Melt Spinning Method and Sintering

2007 ◽  
Vol 534-536 ◽  
pp. 161-164 ◽  
Author(s):  
Taek Soo Kim ◽  
Byong Sun Chun
Keyword(s):  
Solid Solutions ◽  
Thermoelectric Materials ◽  
Figure Of Merit ◽  
Melt Spinning ◽  
Bending Strength ◽  
Sintering Temperature ◽  
Thermoelectric Figure Of Merit ◽  
Vacuum Sintering ◽  
Thermoelectric Figure ◽  
Sintering Processes

N-type Bi2Te3-Sb2Te3 solid solutions doped with CdCl2 was prepared by melt spinning, crushing and vacuum sintering processes. Microstructure, bending strength and thermoelectric property were investigated as a function of the doping quantity from 0.03wt.% to 0.10wt.% and sintering temperature from 400oC to 500oC, and finally compared with those of conventionally fabricated alloys. The alloy showed a good structural homogeneity as well as bending strength of 3.88Kgf/mm2. The highest thermoelectric figure of merit was obtained by doping 0.03wt.% and sintering at 500oC.

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