Improvement in the Thermoelectric Figure-of-Merit of TAGS-85 by Rare Earth Additions

2011 ◽  
Vol 1325 ◽  
Author(s):  
B. A. Cook ◽  
J. L. Harringa ◽  
M. Besser ◽  
R. Venkatasubramanian
Keyword(s):  
Rare Earth ◽  
High Temperature ◽  
Figure Of Merit ◽  
Thermoelectric Figure Of Merit ◽  
X Ray Diffraction ◽  
Nmr Studies ◽  
Thermoelectric Figure ◽  
Rare Earth Additions ◽  
Rare Earth Doped ◽  
Lattice Solid

AbstractTAGS-85 is a well-known thermoelectric material based on germanium monotelluride that exhibits a second-order displacive transformation from a high-temperature cubic to a low-temperature rhombohedral polymorph. Recent efforts to improve the thermoelectric figure-of-merit through the addition of small amounts of the rare earth elements Ce and Yb have demonstrated a 25 percent increase in ZT at 700K in materials obtained by solidification from the melt. Preliminary analysis by x-ray diffraction of the chemically-modified alloy suggests a partial stabilization of the high-temperature cubic polymorph. 125Te NMR studies confirm the incorporation of rare earth cations into the GeTe-based lattice. Solid state synthesis has been successfully applied to the processing of rare-earth-doped TAGS-85 and has resulted in a further increase in ZT beyond the levels initially observed in melt-solidified materials. This is believed to be due to improved homogeneity in the distribution of the lanthanide.

The Enhanced Thermoelectric Properties of Ba0.4Co4Sb11.7Te0.3 Prepared by the High-Pressure and High-Temperature Method

2014 ◽  
Vol 33 (1) ◽  
pp. 59-63
Author(s):  
Song Hao ◽  
Hong An Ma ◽  
Le Deng ◽  
Kai Kai Jie ◽  
Zhe Liu ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Thermoelectric Properties ◽  
Figure Of Merit ◽  
Thermoelectric Figure Of Merit ◽  
X Ray Diffraction ◽  
Thermoelectric Figure ◽  
Seebeck Coefficients ◽  
Temperature Method ◽  
Increasing Temperature

AbstractPolycrystalline skutterudite Ba0.4Co4Sb11.7Te0.3 with a bcc crystal structure was prepared by the High-Pressure and High-Temperature (HPHT) method. The study explored a chemical method for introducing Ba atoms into the voids of CoSb3 to optimize the thermoelectric figure of merit ZT in the system of Ba0.4Co4Sb11.7Te0.3. The samples were characterized by X-ray diffraction, electron microprobe analysis, and thermoelectric properties measurement. The electrical resistivity, Seebeck coefficients and thermal conductivities of the samples were measured in the temperature range of 300–743 K. The power factor and the figure of merit, ZT, of the samples all increased with the increasing temperature. A dimensionless thermoelectric figure of merit of 0.87 at 743 K was achieved for n-type Ba0.4Co4Sb11.7Te0.3 at last. The results indicated Ba-filled CoSb3 prepared by HPHT method is an effective method to greatly enhance the thermoelectric properties of skutterudite compounds.

Thermoelectric Properties of Semiconducting Intermetallic Compounds: FeGa3and RuGa3

2003 ◽  
Vol 793 ◽  
Author(s):  
Y. Amagai ◽  
A. Yamamoto ◽  
C. H. Lee ◽  
H. Takazawa ◽  
T. Noguchi ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Electrical Resistivity ◽  
High Temperature ◽  
Seebeck Coefficient ◽  
Transport Properties ◽  
Figure Of Merit ◽  
Room Temperature ◽  
Thermoelectric Figure Of Merit ◽  
Thermoelectric Figure ◽  
High Seebeck Coefficient

ABSTRACTWe report transport properties of polycrystalline TMGa3(TM = Fe and Ru) compounds in the temperature range 313K<T<973K. These compounds exhibit semiconductorlike behavior with relatively high Seebeck coefficient, electrical resistivity, and Hall carrier concentrations at room temperature in the range of 1017- 1018cm−3. Seebeck coefficient measurements reveal that FeGa3isn-type material, while the Seebeck coefficient of RuGa3changes signs rapidly from large positive values to large negative values around 450K. The thermal conductivity of these compounds is estimated to be 3.5Wm−1K−1at room temperature and decreased to 2.5Wm−1K−1for FeGa3and 2.0Wm−1K−1for RuGa3at high temperature. The resulting thermoelectric figure of merit,ZT, at 945K for RuGa3reaches 0.18.

Enhanced thermoelectric performance of GeTe through in situ microdomain and Ge-vacancy control

2019 ◽  
Vol 7 (25) ◽  
pp. 15181-15189 ◽  
Author(s):  
Khasim Saheb Bayikadi ◽  
Raman Sankar ◽  
Chien Ting Wu ◽  
Chengliang Xia ◽  
Yue Chen ◽  
...  
Keyword(s):  
High Temperature ◽  
Figure Of Merit ◽  
Thermoelectric Performance ◽  
Thermoelectric Figure Of Merit ◽  
Thermoelectric Figure ◽  
Vacancy Level

The thermoelectric figure-of-merit (ZT) for GeTe powder is able to be raised from ∼0.8 to 1.37 at high temperature near ∼500 °C by tuning the Ge vacancy level through a reversible in situ route.

scholarly journals Thermoelectric Lead Telluride with ZnO Nanoparticles

2015 ◽  
Vol 16 (1) ◽  
pp. 62-67
Author(s):  
O. M. Matkivsky
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Seebeck Coefficient ◽  
Figure Of Merit ◽  
Lead Telluride ◽  
Thermoelectric Figure Of Merit ◽  
X Ray Diffraction ◽  
Thermoelectric Figure ◽  
X Ray ◽  
Zno Powder

An X-ray diffraction structural study and measurement of Seebeck coefficient (S), the electrical conductivity (σ) and thermal conductivity (χ) for Lead Telluride with nanoinclusions of ZnO. The calculated value of the specific thermoelectric power (S2σ) and thermoelectric figure of merit (ZT). It was established that the addition of ZnO powder Nanodispersed diameter grains (40-60) nm PbTe reduces the thermal conductivity of the material, and at 0.5 wt.% ZnO to an increase of lead telluride thermoelectric figure of merit to ZT≈1,3.

Optimization of High Thermoelectric Figure-of-Merit in p-type Ag1-x(Pb1-ySny)mSb1-zTem+2

2007 ◽  
Vol 1044 ◽  
Author(s):  
Kyunghan Ahn ◽  
Mercouri G Kanatzidis
Keyword(s):  
High Temperature ◽  
Thermoelectric Properties ◽  
High Performance ◽  
Figure Of Merit ◽  
Thermoelectric Figure Of Merit ◽  
Thermoelectric Figure ◽  
Practical Applications ◽  
P Type

AbstractThe Ag1-x(Pb1-ySny)mSb1-zTem+2 compounds have been found to exhibit high performance p-type thermoelectric properties and are now being considered for practical applications. In this paper, various m values and silver concentrations were investigated to determine the effect on thermoelectric properties. Also, the charge-compensated compounds were studied in order to eliminate the problem of excess tellurium evaporation at high temperature.

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 Vanadium-free colusites Cu26A2Sn6S32 (A = Nb, Ta) for environmentally friendly thermoelectrics

2016 ◽  
Vol 4 (39) ◽  
pp. 15207-15214 ◽  
Author(s):  
Yuta Kikuchi ◽  
Yohan Bouyrie ◽  
Michihiro Ohta ◽  
Koichiro Suekuni ◽  
Makoto Aihara ◽  
...  
Keyword(s):  
High Temperature ◽  
Thermoelectric Materials ◽  
Figure Of Merit ◽  
Environmentally Friendly ◽  
Cost Effective ◽  
Thermoelectric Figure Of Merit ◽  
Thermoelectric Figure

We have successfully developed environmentally-friendly and cost-effective thermoelectric materials based on colusites Cu26A2Sn6S32 (A = Nb, Ta). The vanadium-free colusites show enhanced thermoelectric figure of merit ZT at high temperature.

scholarly journals Enhanced thermoelectric performance and high-temperature thermal stability of p-type Ag-doped β-Zn4Sb3

2018 ◽  
Vol 6 (9) ◽  
pp. 4079-4087 ◽  
Author(s):  
Lirong Song ◽  
Anders B. Blichfeld ◽  
Jiawei Zhang ◽  
Hidetaka Kasai ◽  
Bo B. Iversen
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Figure Of Merit ◽  
Thermoelectric Performance ◽  
Thermoelectric Figure Of Merit ◽  
Thermoelectric Figure ◽  
Ag Doping ◽  
P Type ◽  
Thermal Stability Of

Ag doping in β-Zn4Sb3 leads to the enhanced thermoelectric figure-of-merit (zT) and improved high-temperature thermal stability.

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