Thermoelectric Power, Electrical Resistance, and Crystalline Structure of Carbons

Loebner, E.E.

doi:10.1103/physrev.102.46

Cited by 58 publications

(15 citation statements)

References 31 publications

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“…Loebner [18] reported increased brittleness of the parts of his platinum threads that had been close to the carbon samples. This was observed when the overall temperature was 800 K for prolonged intervals of time, and he ascribed it to diffusion of carbon into the platinum threads.…”

Section: A Experimental Resultsmentioning

confidence: 97%

“…Loebner [18] reported an uncertainty of less than 2 pct, whereas La Rosa [17] did not give any relevant uncertainties. One cannot draw conclusions as to how the value for is S* C influenced by whether the electrode carbon has been used in an electrolysis cell.…”

Section: A Experimental Resultsmentioning

confidence: 99%

“…[14] Figure 3 shows a sketch of the oven used, a normal Kanthal oven for use up to 1300 ЊC made as described by Motzfeldt. [15] In the figure, (1) is a cooling system for the oven (a thin copper pipe with water flowing through it), (2) is the insulating material, (3) is a Kanthal Al heating wire, (4) is a carbon stick (the conductor), (5) is an extra heating element with Kanthal Al heating wire, (6) is a type-S thermoelement [18] 10 300…”

Section: Methodsmentioning

confidence: 99%

“…The last line contains values obtained from La Rosa. [17] Loebner [18] did no experiments at such high temperatures. Table IV shows the results from measurements with T mr around 950 ЊC.…”

Section: A Transported Entropy In Carbonmentioning

confidence: 98%

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Peltier effects in electrode carbon

Hansen

Egner

Kjelstrup

1998

Metall Mater Trans B

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The thermoelectric power of a cell with platinum electrodes and a carbon conductor was determined. The electromotive force (emf) was measured as a function of the temperature difference between the electrodes at temperatures varying from 310 ЊC to 970 ЊC. From these measurements, the transported entropy of electric charge in carbon was found to vary from Ϫ1.7 to Ϫ1.9 J/(K mole) at temperatures around 300 ЊC, from Ϫ2.0 to Ϫ2.3 J/(K mole) at temperatures around 550 ЊC, and from Ϫ3.4 to Ϫ3.7 J/(K mole) at temperatures around 950 ЊC. This transported entropy had not before been determined for temperatures above 550 ЊC. Also, it is shown how the previously neglected surface properties can be taken into account to interpret the measurements. In the Hall-Héroult cell, the anode is made of a similar kind of carbon. Hence, the transported entropy found above can be used to describe the often neglected coupling between transport of heat and electric charge in this electrode. It is shown that the calculated electric potential profile through a coal sample will change significantly if the coupling is neglected, but the calculated temperature profile is independent of whether the coupling is neglected. New equations are also developed that can be used to evaluate the importance of the coupling in other systems.

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Section: A Experimental Resultsmentioning

confidence: 97%

Section: A Experimental Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…The last line contains values obtained from La Rosa. [17] Loebner [18] did no experiments at such high temperatures. Table IV shows the results from measurements with T mr around 950 ЊC.…”

Section: A Transported Entropy In Carbonmentioning

confidence: 98%

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Peltier effects in electrode carbon

Hansen

Egner

Kjelstrup

1998

Metall Mater Trans B

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“…The electrical conductivity of polycrystalline carbon is usually in the range between 1 × 10 4 and 20 × 10 4 Ω −1 m −1 [7][8][9]. At 22…”

Section: Introductionmentioning

confidence: 99%

Transport properties of interpenetrating phase composites tin-carbon

Krcho¹

2016

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Interpenetrating phase composites carbon-tin prepared by the pressure infiltration technology were tested in terms of electrical conductivity, thermal conductivity and sound velocity relating to the tin content (up to 25 vol.%. Sn). Results obtained show that at tin concentration xc = 7.9 vol.% the continuous cluster of the tin component in the carbon skeleton is formed. As a result, the percolation of electrons in composites occurred changing the concentration dependence of electrical conductivity from linear to power. Thermal conductivity and sound velocity of composites increased linearly with increase in tin content without being influenced by the tin cluster structure.K e y w o r d s :

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Electronic Transport Properties

Delhaès¹

2013

Carbon‐based Solids and Materials

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Results of a thermoelectric power component (S f) and electrical resistivity (ρ f) measurements connected with the temperature unstable intermediate valence of Ce are presented for CeNi, CeNi 2 and CeNi 2 Si 2 compounds in the temperature range 4-800 K. It is shown that dependences S f (T) and ρ f (T) are well described in a wide temperature range within the framework of a simple model of a narrow peak in the density of states g f (E) of Lorentzian shape near the Fermi level. The width of the peak depends on temperature and defines the characteristic single-ion Kondo temperature T K .

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Thermoelectric Power, Electrical Resistance, and Crystalline Structure of Carbons

Cited by 58 publications

References 31 publications

Peltier effects in electrode carbon

Peltier effects in electrode carbon

Transport properties of interpenetrating phase composites tin-carbon

Electronic Transport Properties

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