Thermoelectric Power of Graphite Acceptor Compounds

1982 ◽  
Vol 20 ◽  
Author(s):  
Ko Sugihara
Keyword(s):  
Cross Section ◽  
Point Defects ◽  
Low Temperatures ◽  
Rayleigh Scattering ◽  
Boundary Scattering ◽  
Phonon Drag ◽  
Large Cross Section ◽  
Drag Effect ◽  
Temperature Variations ◽  
Graphite Intercalation

ABSTRACTTemperature variations of the thermopower (TEP) of acceptor graphite intercalation compounds (GIC) are very different from that of pristine graphite. At low temperatures the TEP increases monotonically with T, then levels off above 150 K. This behavior is ascribed to the phonon drag effect. In the region where the TEP is nearly constant, phonon relaxation is mainly controlled by the Rayleigh scattering due to point defects or impurities. This process leads to T-independent phonon drag TEP. The importance of Rayleigh scattering is due to the large cross section diameter of the Fermi surface in GIC. At low temperatures where the boundary scattering becomes important, the TEP is proportional to T3 . Detailed calculations are carried out by solving the phonon-carrier coupled Boltzmann equation.

PHONON-DRAG EFFECT OF ULTRA-THIN FeSi2 AND MnSi1.7/FeSi2 FILMS

2011 ◽  
Vol 25 (22) ◽  
pp. 1829-1838 ◽  
Author(s):  
Q. R. HOU ◽  
B. F. GU ◽  
Y. B. CHEN ◽  
Y. J. HE
Keyword(s):  
Electrical Resistivity ◽  
Seebeck Coefficient ◽  
Single Crystals ◽  
Thermoelectric Power ◽  
Power Factor ◽  
Low Temperatures ◽  
Room Temperature ◽  
Phonon Drag ◽  
Drag Effect ◽  
Thermoelectric Power Factor

Phonon-drag effect usually occurs in single crystals at very low temperatures (10–200 K). Strong phonon-drag effect is observed in ultra-thin β- FeSi 2 films at around room temperature. The Seebeck coefficient of a 23 nm-thick β- FeSi 2 film can reach -1.375 mV/K at 343 K. However, the thermoelectric power factor of the film is still small, only 0.42×10-3 W/m-K2, due to its large electrical resistivity. When a 27 nm-thick MnSi 1.7 film with low electrical resistivity is grown on it, the thermoelectric power factor of the MnSi 1.7 film can reach 1.5×10-3 W/m-K2 at around room temperature. This value is larger than that of bulk MnSi 1.7 material in the same temperature range.

Transmitted Phonon Drag Effect in Germanium at Very Low Temperatures

1964 ◽  
Vol 12 (9) ◽  
pp. 217-219 ◽  
Author(s):  
Edward J. Walker ◽  
Robert W. Keyes
Keyword(s):  
Low Temperatures ◽  
Phonon Drag ◽  
Drag Effect

Phonon-drag effect in GaAs-AlxGa1−xAs heterostructures at very low temperatures

1988 ◽  
Vol 37 (11) ◽  
pp. 6377-6380 ◽  
Author(s):  
C. Ruf ◽  
H. Obloh ◽  
B. Junge ◽  
E. Gmelin ◽  
K. Ploog ◽  
...  
Keyword(s):  
Low Temperatures ◽  
Phonon Drag ◽  
Drag Effect

Phonon-Drag Effect on Seebeck Coefficient in Co-Doped Si Wire with Submicrometer-Scaled Cross Section

2017 ◽  
Vol E100.C (5) ◽  
pp. 486-489 ◽  
Author(s):  
Yuhei SUZUKI ◽  
Faiz SALLEH ◽  
Yoshinari KAMAKURA ◽  
Masaru SHIMOMURA ◽  
Hiroya IKEDA
Keyword(s):  
Seebeck Coefficient ◽  
Cross Section ◽  
Phonon Drag ◽  
Drag Effect ◽  
Co Doped

Thermo-electricity at low temperatures VII. Thermo-electricity of the alkali metals between 2 and 20 °K

1958 ◽  
Vol 248 (1252) ◽  
pp. 107-118 ◽  
Keyword(s):  
Electric Power ◽  
Low Temperatures ◽  
Alkali Metals ◽  
Electric Force ◽  
Phonon Drag ◽  
Drag Effect ◽  
Thermo Electric ◽  
Temperature Range ◽  
The Absolute

In earlier work, the absolute thermo-electric force, E of the alkalis was measured from about 60°K down to about 4°K. The absolute thermo-electric power ( S=dE/dT ) could then be derived with fair accuracy down to perhaps 8°K. The thermo-electric power of all the alkali metals has now been measured directly between 2 and 20°K, and the Thomson heats derived therefrom. The results are compared with the theory both of the ‘normal’ thermo-electric power and the Gurevich or ‘phonon-drag’ effect. It is clear from the work that experiments below 1 °K in this field will be of much interest and a programme has been started in this temperature range.

Air exchange dynamics in the system of large cross-section blind roadways

2020 ◽  
Vol 2 ◽  
pp. 46-57
Author(s):  
S.V. Maltsev ◽  
◽  
B.P. Kazakov ◽  
A.G. Isaevich ◽  
M.A. Semin ◽  
...  
Keyword(s):  
Cross Section ◽  
Large Cross Section ◽  
Air Exchange
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