THERMOELECTRIC PROPERTIES OF Bi2Te3–Sb2Te3 ALLOYS

Alloys of nominal composition Bi2−xSbxTe3+y were prepared in an evacuated, sealed ampule by a horizontal zone melting method. Single-crystal samples were cut from the ingots, and measurements of Seebeck coefficient, electrical conductivity, thermoelectric figure of merit (Z), and thermal conductivity (κ) were made over a temperature range of 160 to 360 °K using the Peltier–Seebeck method developed by Harman. Alloys of nominal composition Bi2−xSbxTe3.13 were found to be n type for [Formula: see text] and p type for x > 1. In alloys of high antimony content, the hole concentration was influenced very little by the amount of excess tellurium. The change of Z was studied by varying y from 0.06 to 0.26 at x equal to 0, 0.25, 1.4, 1.5, and 1.6 respectively. Optimum doping to maximize Z did not appear to be possible in a simple way over the entire range of x between 0 and 2. The temperature dependence of κ indicated that the maximum Z at x = 1.5 may be limited by an ambipolar contribution.

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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.

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High-Thermoelectric Figure of Merit Realized in p-Type Half-Heusler Compounds: ZrCoSnxSb1-x

Japanese Journal of Applied Physics ◽

10.1143/jjap.46.l673 ◽

2007 ◽

Vol 46 (No. 27) ◽

pp. L673-L675 ◽

Cited By ~ 58

Author(s):

Takeyuki Sekimoto ◽

Ken Kurosaki ◽

Hiroaki Muta ◽

Shinsuke Yamanaka

Keyword(s):

Figure Of Merit ◽

Thermoelectric Figure Of Merit ◽

Heusler Compounds ◽

Thermoelectric Figure ◽

P Type

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The effects of Ge doping on the thermoelectric performance of p-type polycrystalline SnSe

RSC Advances ◽

10.1039/c6ra23904h ◽

2016 ◽

Vol 6 (115) ◽

pp. 114825-114829 ◽

Cited By ~ 11

Author(s):

Tessera Alemneh Wubieneh ◽

Cheng-Lung Chen ◽

Pai Chun Wei ◽

Szu-Yuan Chen ◽

Yang-Yuan Chen

Keyword(s):

Figure Of Merit ◽

Thermoelectric Performance ◽

Thermoelectric Figure Of Merit ◽

Thermoelectric Figure ◽

P Type ◽

Ge Doping

Ge doping enables to enhance the thermoelectric figure of merit of SnSe..

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Термоэлектрические свойства нанокомпозитного Bi-=SUB=-0.45-=/SUB=-Sb-=SUB=-1.55-=/SUB=-Te-=SUB=-2.985-=/SUB=- с микрочастицами SiO-=SUB=-2-=/SUB=-

Физика и техника полупроводников ◽

10.21883/ftp.2019.06.47721.30 ◽

2019 ◽

Vol 53 (6) ◽

pp. 751

Author(s):

А.А. Шабалдин ◽

П.П. Константинов ◽

Д.А. Курдюков ◽

Л.Н. Лукьянова ◽

А.Ю. Самунин ◽

...

Keyword(s):

Thermal Conductivity ◽

Solid Solution ◽

Electrical Conductivity ◽

Wide Temperature Range ◽

Figure Of Merit ◽

Nanostructured Material ◽

Thermoelectric Figure Of Merit ◽

Thermoelectric Efficiency ◽

Thermoelectric Figure ◽

P Type

AbstractNanocomposite thermoelectrics based on Bi_0.45Sb_1.55Te_2.985 solid solution of p -type conductivity are fabricated by the hot pressing of nanopowders of this solid solution with the addition of SiO_2 microparticles. Investigations of the thermoelectric properties show that the thermoelectric power of the nanocomposites increases in a wide temperature range of 80–420 K, while the thermal conductivity considerably decreases at 80–320 K, which, despite a decrease in the electrical conductivity, leads to an increase in the thermoelectric efficiency in the nanostructured material without the SiO_2 addition by almost 50% (at 300 K). When adding SiO_2, the efficiency decreases. The initial thermoelectric fabricated without nanostructuring, in which the maximal thermoelectric figure of merit ZT = 1 at 390 K, is most efficient at temperatures above 350 K.

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Enhanced thermoelectric figure of merit in p-type Ag-doped ZnSb nanostructured with Ag3Sb

Scripta Materialia ◽

10.1016/j.scriptamat.2013.05.029 ◽

2013 ◽

Vol 69 (5) ◽

pp. 397-400 ◽

Cited By ~ 57

Author(s):

Ding-Bang Xiong ◽

Norihiko L. Okamoto ◽

Haruyuki Inui

Keyword(s):

Figure Of Merit ◽

Thermoelectric Figure Of Merit ◽

Thermoelectric Figure ◽

P Type

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Doubled Thermoelectric Figure of Merit in p-Type β-FeSi2 via Synergistically Optimizing Electrical and Thermal Transports

ACS Applied Materials & Interfaces ◽

10.1021/acsami.0c00321 ◽

2020 ◽

Vol 12 (11) ◽

pp. 12901-12909 ◽

Cited By ~ 1

Author(s):

Xiaolong Du ◽

Pengfei Qiu ◽

Jun Chai ◽

Tao Mao ◽

Ping Hu ◽

...

Keyword(s):

Figure Of Merit ◽

Thermoelectric Figure Of Merit ◽

Thermoelectric Figure ◽

P Type

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Improved thermoelectric efficiency in p-type ZnSb through Zn deficiency

Functional Materials Letters ◽

10.1142/s1793604715500289 ◽

2015 ◽

Vol 08 (02) ◽

pp. 1550028 ◽

Cited By ~ 16

Author(s):

Qilong Guo ◽

Sijun Luo

Keyword(s):

Figure Of Merit ◽

Lattice Thermal Conductivity ◽

Hole Concentration ◽

Zn Deficiency ◽

Thermoelectric Efficiency ◽

Thermoelectric Figure ◽

Pristine Sample ◽

Zn Content ◽

P Type ◽

Content Regulation

We herein report a feasible approach to improve the thermoelectric performance of p-type ZnSb compound by Zn content regulation. It is found that Zn vacancies formed by Zn deficiency not only efficiently enhance the electrical conductivity due to the improved hole concentration but also markedly lower the lattice thermal conductivity on account of the reinforced point defect scattering of phonons. The ZnSb compound with a nominal 3 mol.% Zn deficiency shows a maximum thermoelectric figure of merit ZT of ~ 0.8 at 700 K which is a ~ 60% improvement over the pristine sample. The strategies of further enhancing the performance of ZnSb -based material have been discussed.

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High Temperature Thermoelectric Properties of AgPb18+xSbTe20

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.336-338.857 ◽

2007 ◽

Vol 336-338 ◽

pp. 857-859

Author(s):

Wen Bing Zhang ◽

Li Dong Chen ◽

Xiao Ya Li

Keyword(s):

Crystal Structure ◽

Figure Of Merit ◽

Lead Telluride ◽

Thermoelectric Figure Of Merit ◽

Thermoelectric Figure ◽

Pure Lead ◽

Melting Method ◽

Temperature Range ◽

Plasma Sintering ◽

Spark Plasma

Polycrystalline AgPb18+xSbTe20 compounds with different Pb contents (x=1-4) were prepared by melting method and spark plasma sintering techniques. The crystal structure and chemical composition were determined by XRD and EPMA. The thermal conductivity, electrical conductivity and Seebeck coefficient were measured in the temperature range of 300-800K. The dimensionless thermoelectric figure of merit (ZT) of AgPb18+xSbTe20 (x=1-4) increases in the whole temperature range of 300-750K which is different to the pure lead telluride compound. The maximum ZT value reaches 1.03 at 800K.

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