Author: V. Drebushchak
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  • 1 Institute of Geology and Mineralogy SB RAS, Pr. Ac. Koptyuga 3, Novosibirsk, 630090 Russia
  • | 2 ‘Molecular Design and Ecologically Safe Technologies’ REC-008, Novosibirsk State University, Ul. Pirogova 2, Novosibirsk, 630090 Russia
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Abstract  

Thermodynamic model for the quantitative description of the electromotive force in a thermocouple has been developed. Thermodynamic equilibrium was applied to the system of electrons in two metals in a contact, contrary to the consideration of the dynamics of electrons in a metal under external temperature gradient in the previous classical (Drude) and quantum (Sommerfeld) approaches. The new model has two parameters, the ‘universal’ sensitivity ɛ0 and the characteristic temperature of a particular thermocouple Θv, and quite simple expression for the emf ΔU0(T−Θvln(1+Tv) and sensitivity ɛ(T)=ɛ0T/(Θv+T). The model is shown to fit the experimental data very well at low temperatures. At high temperatures, the model is less accurate. The characteristic temperature Θv depends on the difference between the electron heat capacity coefficients γ1−γ2 of two metals in the thermocouple. The greater the difference, the higher the sensitivity of the thermocouple.

Manuscript Submission: HERE

  • Impact Factor (2019): 2.731
  • Scimago Journal Rank (2019): 0.415
  • SJR Hirsch-Index (2019): 87
  • SJR Quartile Score (2019): Q3 Condensed Matter Physics
  • SJR Quartile Score (2019): Q3 Physical and Theoretical Chemistry
  • Impact Factor (2018): 2.471
  • Scimago Journal Rank (2018): 0.634
  • SJR Hirsch-Index (2018): 78
  • SJR Quartile Score (2018): Q2 Condensed Matter Physics
  • SJR Quartile Score (2018): Q2 Physical and Theoretical Chemistry

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
4
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)