Anomalous increase of the thermopower and thermoelectric figure of merit in Ga-doped p-(Bi0.5Sb0.5)2Te3 single crystals

Having recently succeeded in synthesizing large single crystals of (Ca2CoO3)CoO2 (Co-349) with superior thermoelectric properties using a modified flux method, we have prepared a composite material of Co-349 powder and single crystals and examined its thermoelectric properties. The electrical conductivity σ of this composite, which contained 20 wt.% single crystals, was higher than that of a sample without the single crystals. While the achievable effect has yet to be fully realized, improved grain alignment and the effect of current bypassing grain boundaries through the large single crystals in the composite are thought to cause the increasing σ, which consequently results in an enhanced thermoelectric figure of merit of about 0.56 at 973 K in air.

Download Full-text

Structure and thermoelectric properties of the n-type clathrate Ba8Cu5.1Ge40.2Sn0.7

Journal of Materials Chemistry A ◽

10.1039/c5ta04168f ◽

2015 ◽

Vol 3 (37) ◽

pp. 19100-19106 ◽

Cited By ~ 14

Author(s):

Jingtao Xu ◽

Jiazhen Wu ◽

Hezhu Shao ◽

Satoshi Heguri ◽

Yoichi Tanabe ◽

...

Keyword(s):

Single Crystals ◽

Thermoelectric Properties ◽

Figure Of Merit ◽

Type I ◽

Thermoelectric Figure Of Merit ◽

Flux Method ◽

Thermoelectric Figure ◽

Space Group ◽

Maximum Value ◽

Study Type

We study type I clathrate Ba8Cu5.1Ge40.2Sn0.7 single crystals (space group Pm3̄n, no. 223, a = 10.7151(3)) grown using a Sn flux method, and the thermoelectric figure of merit ZT of single crystals reaches a maximum value of 0.6 at 773 K.

Download Full-text

High thermoelectric figure of merit and thermopower in layered perovskite oxides

Physical Review Materials ◽

10.1103/physrevmaterials.3.022401 ◽

2019 ◽

Vol 3 (2) ◽

Cited By ~ 6

Author(s):

Vincenzo Fiorentini ◽

Roberta Farris ◽

Edoardo Argiolas ◽

Maria Barbara Maccioni

Keyword(s):

Figure Of Merit ◽

Perovskite Oxides ◽

Layered Perovskite ◽

Thermoelectric Figure Of Merit ◽

Thermoelectric Figure ◽

Layered Perovskite Oxides

Download Full-text

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

Sustainable Energy & Fuels ◽

10.1039/d0se01817a ◽

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.

Download Full-text

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

Modern Physics Letters B ◽

10.1142/s0217984920500190 ◽

2019 ◽

Vol 34 (02) ◽

pp. 2050019 ◽

Cited By ~ 2

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.

Download Full-text

A strategy for boosting the thermoelectric performance of famatinite Cu3SbS4

Physical Chemistry Chemical Physics ◽

10.1039/c9cp06233e ◽

2020 ◽

Vol 22 (4) ◽

pp. 2081-2086 ◽

Cited By ~ 3

Author(s):

Taiki Tanishita ◽

Koichiro Suekuni ◽

Hirotaka Nishiate ◽

Chul-Ho Lee ◽

Michitaka Ohtaki

Keyword(s):

Figure Of Merit ◽

Thermoelectric Performance ◽

Thermoelectric Figure Of Merit ◽

Thermoelectric Figure ◽

Co Substitution

Co-substitution of Ge and P for Sb in Cu3SbS4 famatinite boosted dimensionless thermoelectric figure of merit.

Download Full-text

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

Materials Science Forum ◽

10.4028/www.scientific.net/msf.534-536.161 ◽

2007 ◽

Vol 534-536 ◽

pp. 161-164 ◽

Cited By ~ 3

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.

Download Full-text

Effects of Ce filling fraction and Fe content on the thermoelectric properties of Co-rich CeyFexCo4−xSb12

Journal of Materials Research ◽

10.1557/jmr.2001.0109 ◽

2001 ◽

Vol 16 (3) ◽

pp. 837-843 ◽

Cited By ~ 66

Author(s):

Xinfeng Tang ◽

Lidong Chen ◽

Takashi Goto ◽

Toshio Hirai

Keyword(s):

Thermal Conductivity ◽

Thermoelectric Properties ◽

Figure Of Merit ◽

Single Phase ◽

Lattice Thermal Conductivity ◽

Hole Concentration ◽

Thermoelectric Figure Of Merit ◽

Thermoelectric Figure ◽

Filling Fraction ◽

Fe Content

Single-phase filled skutterudite compounds, CeyFexCo4−xSb12 (x = 0 to 3.0, y = 0 to 0.74), were synthesized by a melting method. The effects of Fe content and Ce filling fraction on the thermoelectric properties of CeyFexCo4−xSb12 were investigated. The lattice thermal conductivity of Ce-saturated CeyFexCo4−xSb12, y being at the maximum corresponding to x, decreased with increasing Fe content (x) and reached its minimum at about x = 1.5. When x was 1.5, lattice thermal conductivity decreased with increasing Ce filling fraction till y = 0.3 and then began to increase after reaching the minimum at y = 0.3. Hole concentration and electrical conductivity of Cey Fe1.5Co2.5Sb12 decreased with increasing Ce filling fraction. The Seebeck coefficient increased with increasing Ce filling fraction. The greatest dimensionless thermoelectric figure of merit T value of 1.1 was obtained at 750 K for the composition of Ce0.28Fe1.52Co2.48Sb12.

Download Full-text