Electronic Structure and Thermoelectric Properties of Ytterbium-Filled Skutterudites

2001 ◽  
Vol 691 ◽  
Author(s):  
Hiroaki Anno ◽  
Kazuhiro Ashida ◽  
Kakuei Matsubara ◽  
George S. Nolas ◽  
Koji Akai ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Thermoelectric Properties ◽  
Photoelectron Spectroscopy ◽  
Figure Of Merit ◽  
High Electron ◽  
Thermoelectric Figure ◽  
Electron Model ◽  
X Ray ◽  
Strong Hybridization ◽  
Filled Skutterudites

ABSTRACTThe electronic structure and thermoelectric properties of Yb partially filled CoSb3 skutterudite compounds have been investigated by x-ray photoelectron spectroscopy and band calculation in terms of an itinerant f electron model. In these materials, the significant effect of Yb filling is the large reduction of lattice thermal conductivity, remaining relatively high electron mobility and Seebeck coefficient, resulting in high thermoelectric figure of merit. We discuss the effects of the valence fluctuation between Yb2+ and Yb3+ and the strong hybridization of Yb 4f states with the valence band states on the electronic properties and their relation to thermoelectric properties for Yb partially filled CoSb3 compounds.

Influence of Sn on the structural and thermoelectric properties of the type-I clathrates Ba8Cu5Si6Ge35-xSnx (0 ≤ x ≤ 0.6)

2013 ◽  
Vol 1490 ◽  
pp. 19-26 ◽  
Author(s):  
X. Yan ◽  
E. Bauer ◽  
P. Rogl ◽  
S. Paschen
Keyword(s):  
Thermoelectric Properties ◽  
Powder Diffraction ◽  
High Frequency ◽  
Figure Of Merit ◽  
Type I ◽  
Thermoelectric Figure Of Merit ◽  
Thermoelectric Figure ◽  
X Ray ◽  
Free Sample ◽  
And Shifts

ABSTRACTOn the search for cost-competitive thermoelectric clathrates we have investigated the influence of Sn substitutions for Ge on the structural and thermoelectric properties of the type-I clathrate Ba8Cu5Si6Ge35. The solid solubility of Sn was found to be limited to 0.6 atoms per unit cell. A series of compounds with the nominal compositions Ba8Cu5Si6Ge35-xSnx (x = 0.2, 0.4, 0.6) was synthesized in a high-frequency furnace. The samples were annealed, and subsequently ball milled and hot pressed. The hot pressed samples were characterized by X-ray powder diffraction, energy-dispersive X-ray spectroscopy and transport property measurements. Our results show that the substitution of Ge by Sn introduces vacancies at the 6d site of the type-I clathrate structure and shifts the highest dimensionless thermoelectric figure of merit ZT from 570 °C for the Sn free sample to lower temperatures. The highest figure of merit ZT = 0.42 is reached at about 320 °C for the Sn-substituted sample Ba8Cu5Si6Ge35Sn0.6.

scholarly journals Modulation of the electronic structure and thermoelectric properties of orthorhombic and cubic SnSe by AgBiSe2 alloying

2021 ◽  
Vol 12 (39) ◽  
pp. 13074-13082
Author(s):  
Sushmita Chandra ◽  
Raagya Arora ◽  
Umesh V. Waghmare ◽  
Kanishka Biswas
Keyword(s):  
Electronic Structure ◽  
Thermoelectric Properties ◽  
Electronic Structures ◽  
Figure Of Merit ◽  
Thermoelectric Figure Of Merit ◽  
Thermoelectric Figure

AgBiSe2 alloying in SnSe tailors its crystal and electronic structures, which boost its thermoelectric figure of merit to 1.3.

Effects of indium-filling and synthesis pressure on the thermoelectric properties of CoSb3

2014 ◽  
Vol 28 (15) ◽  
pp. 1450118 ◽  
Author(s):  
Le Deng ◽  
Li Bin Wang ◽  
Jie Ming Qin ◽  
Tao Zheng ◽  
Xiao Peng Jia ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Thermoelectric Properties ◽  
Figure Of Merit ◽  
Processing Time ◽  
Room Temperature ◽  
Thermoelectric Figure Of Merit ◽  
X Ray Diffraction ◽  
Thermoelectric Figure ◽  
X Ray ◽  
Scanning Electron

In x Co 4 Sb 12 skutterudite compounds have been prepared successfully at different synthesis pressures by high pressure and high temperature (HPHT) method, the processing time has been reduced from a few days to half an hour. In addition, the effect of synthesis pressure on the thermoelectric properties of In 0.4 Co 4 Sb 12 compounds has been investigated in this paper. The structure of In 0.4 Co 4 Sb 12 samples was evaluated by means of X-ray diffraction and scanning electron microscopy (SEM). The Seebeck coefficient, electrical resistivity and thermal conductivity were all measured in the temperature range of room temperature to 673 K. The sample synthesized at 2.0 GPa showed the highest power factor of 29.3 μWcm-1K-2 at 373 K. A dimensionless thermoelectric figure of merit (ZT) of 0.51 at 673 K was achieved for n-type In 0.4 Co 4 Sb 12 prepared at 1.3 GPa, which was significantly enhanced in comparison with pure CoSb 3.

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.

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

2001 ◽  
Vol 16 (3) ◽  
pp. 837-843 ◽  
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.

A study of the FeX (X=Si, Ge) system electronic structure by X-ray photoelectron spectroscopy

2000 ◽  
Vol 447 (1-3) ◽  
pp. 112-116 ◽  
Author(s):  
I.N. Shabanova ◽  
V.I. Kormilets ◽  
L.D. Zagrebin ◽  
N.S. Terebova
Keyword(s):  
Electronic Structure ◽  
Photoelectron Spectroscopy ◽  
X Ray

scholarly journals Electronic structure of β-Ta films from X-ray photoelectron spectroscopy and first-principles calculations

2019 ◽  
Vol 470 ◽  
pp. 607-612 ◽  
Author(s):  
Martin Magnuson ◽  
Grzegorz Greczynski ◽  
Fredrik Eriksson ◽  
Lars Hultman ◽  
Hans Högberg
Keyword(s):  
Electronic Structure ◽  
First Principles ◽  
Photoelectron Spectroscopy ◽  
First Principles Calculations ◽  
X Ray

Electronic structure of Ni and Pd alloys. I. X-ray photoelectron spectroscopy of the valence bands

1983 ◽  
Vol 27 (4) ◽  
pp. 2145-2178 ◽  
Author(s):  
John C. Fuggle ◽  
F. Ulrich Hillebrecht ◽  
R. Zeller ◽  
Zygmunt Zołnierek ◽  
Peter A. Bennett ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Photoelectron Spectroscopy ◽  
X Ray ◽  
Valence Bands
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