Bismuth telluride–copper telluride nanocomposites from heterostructured building blocks

2020 ◽  
Vol 8 (40) ◽  
pp. 14092-14099
Author(s):  
Yu Zhang ◽  
Yu Liu ◽  
Mariano Calcabrini ◽  
Congcong Xing ◽  
Xu Han ◽  
...  
Keyword(s):  
Bismuth Telluride ◽  
Figure Of Merit ◽  
Building Blocks ◽  
Thermoelectric Figure Of Merit ◽  
Thermoelectric Figure ◽  
Copper Telluride

Appropriately designed Bi2Te3–Cu2−xTe nanocomposites allow an improvement of over 50% of the thermoelectric figure of merit of Bi2Te3.

SIZE-DEPENDENT ERRORS IN Z DETERMINATION USING THE HARMAN METHOD

1965 ◽  
Vol 43 (9) ◽  
pp. 1589-1603 ◽  
Author(s):  
C. H. Champness ◽  
P. C. Parekh
Keyword(s):  
Bismuth Telluride ◽  
Figure Of Merit ◽  
Absolute Temperature ◽  
Thermoelectric Figure Of Merit ◽  
Sectional Area ◽  
Thermoelectric Figure ◽  
Cross Sectional ◽  
Harman Method ◽  
Size Dependent ◽  
Current Leads

The effect of sample size on the measured thermoelectric figure of merit (Zm) determined by the Peltier–Seebeck or Harman method has been studied by progressively halving the area (As) and length (ls) of bismuth telluride alloy samples. Measurements were carried out with As values from 1 to 0.01 cm2, la values from 2 to 0.5 cm, and three different gauges of current leads (cross-sectional area Aw). The relative decrease of Zm was found to vary approximately as sech [Formula: see text] with Aw and ls constant, as In Aw with As and ls constant, and as T4/s2 with Aw and As constant, where T is the absolute temperature. The variation with As and Aw appears to be due to conduction along the sample leads, while the variation with ls is well accounted for by radiation to and from the sample. With 40 A.W.G. wires, the error in the measured figure of merit is estimated to be about 5% for a sample of dimensions 0.5 × 0.5 × 1 cm and around 50% for a sample of size 0.1 × 0.1 × 2 cm.

Extraordinary thermoelectric performance of NaBaBi with degenerate and highly non-parabolic bands compared to LiBaSb and Bi2Te3

2021 ◽  
Author(s):  
Enamul Haque
Keyword(s):  
Fermi Level ◽  
Figure Of Merit ◽  
Thermoelectric Performance ◽  
Thermoelectric Figure Of Merit ◽  
Thermoelectric Figure

This article reports the extraordinary thermoelectric figure of merit (ZT) of NaBaBi: degenerate bands, instead of the valley degeneracy of Bi2Te3, highly non-parabolic bands, and low DOS near the Fermi level of NaBaBi lead to an extraordinary ZTisotropic ≈ 1.60 at 350 K.

Influence of multi-sintering on the thermoelectric properties of Bi2Sr2Co2Oy ceramics

2019 ◽  
Vol 34 (02) ◽  
pp. 2050019 ◽  
Author(s):  
Y. Zhang ◽  
M. M. Fan ◽  
C. C. Ruan ◽  
Y. W. Zhang ◽  
X.-J. Li ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermoelectric Properties ◽  
Figure Of Merit ◽  
Phonon Scattering ◽  
Sintered Sample ◽  
Thermoelectric Figure Of Merit ◽  
Thermoelectric Figure ◽  
The Third ◽  
Ceramic Samples ◽  
Optimum Formula

[Formula: see text] ceramic samples have a structure similar to phonon glass electronic crystals, and their thermoelectric properties can be effectively adjusted through repeated grinding and sintering. The results show that multi-sintering can make their grain refined and increase their grain boundary, which will effectively increase density and phonon scattering. Finally, multi-sintering can reduce the resistivity and thermal conductivity, thus obviously improve thermoelectric figure of merit [Formula: see text] of [Formula: see text]. The optimum [Formula: see text] value of 0.26 is achieved at 923 K by the third sintered sample.

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