scholarly journals Precise measurement of absolute Seebeck coefficient from Thomson effect using ac-dc technique

AIP Advances ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 065312 ◽  
Author(s):  
Y. Amagai ◽  
T. Shimazaki ◽  
K. Okawa ◽  
H. Fujiki ◽  
T. Kawae ◽  
...  
Keyword(s):  
Seebeck Coefficient ◽  
Precise Measurement ◽  
Thomson Effect ◽  
Absolute Seebeck Coefficient

Influence of Thomson effect on the resultant local Seebeck coefficient in thermoelectric composite materials

2008 ◽  
Vol 94 (1) ◽  
pp. 57-64 ◽  
Author(s):  
Osamu Yamashita ◽  
Hirotaka Odahara ◽  
Takahiro Ochi ◽  
Kouji Satou
Keyword(s):  
Composite Materials ◽  
Seebeck Coefficient ◽  
Thomson Effect

High-temperature thermoelectric properties of W-substituted CaMnO3

2013 ◽  
Vol 1490 ◽  
pp. 3-8 ◽  
Author(s):  
Dimas S. Alfaruq ◽  
James Eilertsen ◽  
Philipp Thiel ◽  
Myriam H Aguirre ◽  
Eugenio Otal ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Electrical Resistivity ◽  
High Temperature ◽  
Seebeck Coefficient ◽  
Thermoelectric Properties ◽  
Soft Chemistry ◽  
Absolute Seebeck Coefficient

AbstractThe thermoelectric properties of W-substituted CaMn1-xWxO3-δ (x = 0.01, 0.03; 0.05) samples, prepared by soft chemistry, were investigated from 300 K to 1000 K and compared to Nb-substituted CaMn0.98Nb0.02O3-δ. All compositions exhibit both an increase in absolute Seebeck coefficient and electrical resistivity with temperature. Moreover, compared to the Nb-substituted sample, the thermal conductivity of the W-substituted samples was strongly reduced. This reduction is attributed to the nearly two times greater mass of tungsten. Consequently, a ZT of 0.19 was found in CaMn0.97W0.03O3-δ at 1000 K, which was larger than ZT exhibited by the 2% Nb-doped sample.

scholarly journals Nanometrology: Absolute Seebeck coefficient of individual silver nanowires

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
M. Kockert ◽  
D. Kojda ◽  
R. Mitdank ◽  
A. Mogilatenko ◽  
Z. Wang ◽  
...  
Keyword(s):  
Seebeck Coefficient ◽  
Bulk Material ◽  
Silver Nanowires ◽  
Mean Free Path ◽  
Phonon Drag ◽  
Nanowire Diameter ◽  
The Absolute ◽  
Electron Mean Free Path ◽  
Absolute Seebeck Coefficient

AbstractThermoelectric phenomena can be strongly modified in nanomaterials. The determination of the absolute Seebeck coefficient is a major challenge for metrology with respect to micro- and nanostructures due to the fact that the transport properties of the bulk material are no more valid. Here, we demonstrate a method to determine the absolute Seebeck coefficient S of individual metallic nanowires. For highly pure and single crystalline silver nanowires, we show the influence of nanopatterning on S in the temperature range between 16 K and 300 K. At room temperature, a nanowire diameter below 200 nm suppresses S by 50% compared to the bulk material to less than S = 1 μVK−1, which is attributed to the reduced electron mean free path. The temperature dependence of the absolute Seebeck coefficient depends on size effects. Thermodiffusion and phonon drag are reduced with respect to the bulk material and the ratio of electron-phonon to phonon-phonon interaction is significantly increased.

Designing Apparatus for Highly Precise Measurement of Electrical Conductivity and Seebeck Coefficient from 85 K to 1200 K

2013 ◽  
Vol 740 ◽  
pp. 426-432 ◽  
Author(s):  
Sopon Budngam ◽  
Aree Wichainchai ◽  
Saichol Pimmongkol ◽  
Udom Tipparach
Keyword(s):  
Electrical Conductivity ◽  
Electrical Resistivity ◽  
Seebeck Coefficient ◽  
Electrical Resistance ◽  
Precise Measurement ◽  
Inert Gas ◽  
Vacuum System ◽  
X Ray Diffraction ◽  
X Ray ◽  
Gas System

We describe the development of apparatus for measuring of electrical conductivity and Seebeck coefficient with high precision from 85 K to 1,200 K. Electrical resistance was measured by means of four-point probe method as a function of temperature. The temperature below 400 K was measured by using type T thermocouple in vacuum system was used and from 400 to 1,200 was measured by using Type S was applied for temperature between 400 and 1200 Kelvin in an inert gas system. With the dimensions of the specimen, the electrical resistivity (ρT) can be obtained in the unit of microohm-centimeter (μΩ-cm) and be written in polynomial, ρT=-0.3191+6.8×10-3T-6.0×10-7 T2+8.0×10-10T3. The electrical conductivity can be obtained by taking inversion of the electrical resistivity. Seebeck coefficient (αT ) can be calculated in microvolt per Kelvin as follows: αT=1.9653-1.49×10-2T+9.0×10-5T2-2.0×10-7T3+2.0×10-10T4-1.0×10-13T5+3.0×10-17T6 , when T is temperature in K. The Seebeck coefficient data was compared with X-ray diffraction (XRD) and X-ray fluorescence (XRF) of the specimen. The result showed that our developrd apparatus yields the same as standard method when copper with purity greater than 99 percent was employed.

scholarly journals Theoretical investigation on the influence of Seebeck and Thomson effects in a thermoelectric generator

2021 ◽  
Author(s):  
Chika Calistus Maduabuchi ◽  
Yuri G. Gurevich
Keyword(s):  
Temperature Gradient ◽  
Seebeck Coefficient ◽  
System Performance ◽  
Thermoelectric Generator ◽  
Operating Temperature ◽  
Geometric Optimization ◽  
Thomson Effect ◽  
Performance Parameters ◽  
Cold Junction ◽  
The Impact

Abstract Four possible cases of modelling a thermoelectric generator (TEG) are presented in this paper. Case 1 models equal hot and cold junction Seebeck coefficient (SC) ignoring Thomson effect (TE), case 2 adopts equal hot and cold junction SC including TE, case 3 defines unequal hot and cold junction SC neglecting TE while case 4 represents unequal hot and cold junction SC with TE. The modified expressions for these cases are derived and employed in a comparative electric and geometric optimization of the TEG. The impact of the harmonious relationship between TE and SC on the optimum and maximum system performance parameters is studied and discussed. The results show that the systems performance can be enhanced or reduced depending on the operating temperature gradient and prevalent relationship between SC and TE. The results obtained from this work should be able to accurately predict the suitable TE and SC configuration for optimum and maximum system performance.

scholarly journals Absolute Seebeck coefficient of thin platinum films

2019 ◽  
Vol 126 (10) ◽  
pp. 105106 ◽  
Author(s):  
M. Kockert ◽  
R. Mitdank ◽  
A. Zykov ◽  
S. Kowarik ◽  
S. F. Fischer
Keyword(s):  
Seebeck Coefficient ◽  
Thin Platinum ◽  
Absolute Seebeck Coefficient
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