Extruded material based on Bi0.85Sb0.15 for thermoelectric converters

2021 ◽  
pp. 11-16
Author(s):  
M.M. Tagiyev ◽  
◽  
G.D. Abdinova ◽  
B.Sh. Barkhalov ◽  
◽  
...  
Keyword(s):  
Magnetic Field ◽  
Heat Treatment ◽  
Single Crystal ◽  
Figure Of Merit ◽  
Thermoelectric Figure Of Merit ◽  
Treatment Mode ◽  
Thermoelectric Figure ◽  
Heat Treatment Mode ◽  
Strong Material ◽  
Thermoelectric Converters

In order to create a sufficiently strong material with thermo- and magneto-thermoelectric figure of merit close to single-crystal samples of material based on Bi-Sb systems, extruded samples of Bi0.85Sb0.15 solid solution were obtained and the effect of composition, heat treatment mode, grain size and tellurium impurities was investigated on their thermoelectric properties in the temperature range ~ 77-300 K and magnetic field strength H up to ~ 74∙104A/m. We managed to obtain extruded material with thermo- and magneto-thermoelectric figure of merit ~6.2∙10-3 K-1 and ~7.2∙10-3K-1 at ~ 77 K, respectively, with strengths ~ 3 times higher than the strength of single-crystal samples of this composition, which are suitable for use in low-temperature thermoelectric converters.

scholarly journals Thermoelectric coefficients and the figure of merit for large open quantum dots

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Robert Whitney ◽  
Keiji Saito
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
External Magnetic Field ◽  
Figure Of Merit ◽  
Matrix Theory ◽  
Thermoelectric Figure Of Merit ◽  
Thermoelectric Figure ◽  
Coherent Transport ◽  
Left And Right ◽  
The Magnetic Field

We consider the thermoelectric response of chaotic or disordered quantum dots in the limit of phase-coherent transport, statistically described by random matrix theory. We calculate the full distribution of the thermoelectric coefficients (Seebeck S and Peltier \PiΠ), and the thermoelectric figure of merit ZT, for large open dots at arbitrary temperature and external magnetic field, when the number of modes in the left and right leads (N_{\rm L} and N_{\rm R}) are large. Our results show that the thermoelectric coefficients and ZT are maximal when the temperature is half the Thouless energy, and the magnetic field is negligible. They remain small, even at their maximum, but they exhibit a type of universality at all temperatures, in which they do not depend on the asymmetry between the left and right leads (N_{\rm L}-N_{\rm R}), even though they depend on (N_{\rm L}+N_{\rm R}).

Thermoelectric properties of (Bi,Pb)–Sr–Co–O oxide

2000 ◽  
Vol 15 (2) ◽  
pp. 382-386 ◽  
Author(s):  
Woosuck Shin ◽  
Norimitsu Murayama
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
High Temperature ◽  
Single Crystal ◽  
Figure Of Merit ◽  
Polycrystalline Sample ◽  
Thermoelectric Figure Of Merit ◽  
Thermoelectric Figure ◽  
Sinter Forging ◽  
Thermoelectric Application

Electrical conductivity and thermopower of Bi2Sr3Co2Ox sintered bodies were first investigated in the temperature range 440–1060 K in air for high-temperature thermoelectric application. The samples fabricated by the sinter-forging method increased their bulk densities and electrical conductivity. The value of thermopower and the temperature dependence of electrical conductivity of the sinter-forged samples were close to that of the single crystal. Evaluating the thermal conductivity of the polycrystalline sample, we calculated a thermoelectric figure of merit Z to be 0.107 × 10−3 K−1 at 1060 K.

scholarly journals Structure and Properties of Materials on the Basis of Ag-Pb-Sb-Te with High Thermоelectric Figure of Merit

2016 ◽  
Vol 17 (1) ◽  
pp. 114-128
Author(s):  
I.V. Horichok ◽  
L.I. Nykyruy ◽  
T.O. Semko ◽  
M.A. Lopуanko ◽  
O.L. Sokolov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermoelectric Materials ◽  
Figure Of Merit ◽  
Thermoelectric Figure Of Merit ◽  
Structure And Properties ◽  
Thermoelectric Figure ◽  
Highly Efficient ◽  
Properties Of Materials ◽  
Thermoelectric Converters

The review of works devoted to the study of thermoelectric, thermodynamic and mechanical properties of highly efficient thermoelectric materials in the system Ag-Pb (Sn) -Sb-Te. It is shown that based on them can be obtained as n-, and district branches of thermoelectric converters with parameter dimensionless thermoelectric figure of merit ZT ≈ 1.5 - 2.0.

NEGATIVE THERMOELECTRIC FIGURE OF MERIT IN A MAGNETIC FIELD

1963 ◽  
Vol 2 (8) ◽  
pp. 157-159 ◽  
Author(s):  
R. Wolfe ◽  
G. E. Smith ◽  
S. E. Haszko
Keyword(s):  
Magnetic Field ◽  
Figure Of Merit ◽  
Thermoelectric Figure Of Merit ◽  
Thermoelectric Figure

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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