Thermoelectric power of glassy carbon
- 1 November 1986
- journal article
- Published by Taylor & Francis in Philosophical Magazine Part B
- Vol. 54 (5) , 381-389
- https://doi.org/10.1080/13642818608236855
Abstract
The thermoelectric power of glassy carbon, heat-treated for three hours between 1200 and 2700°C, has been measured at temperatures from 1·5 to 280 K. The dependence of thermoelectric power S on temperature T can empirically be written as S = aT + bT ½ + S B, where the first term is a strong-scattering metallic component, the second term is attributed to variable-range hopping and the third term is a peaked component. The constant a involves the sign of the carriers in the extended states; carriers change their sign from negative to positive at a heat-treatment temperature of about 1500°C as the heat-treatment temperature is increased. The constant b provides information on the density of states at the Fermi level for the localized states. The nature of S B remains to be explored.Keywords
This publication has 3 references indexed in Scilit:
- Thermoelectric power of soft carbons between 4.2 and 280 K in relation to phonon drag effectCarbon, 1981
- Electrical conduction in glassy carbonJournal of Non-Crystalline Solids, 1978
- On the Theory of Hopping Transport in Disordered SemiconductorsPhysica Status Solidi (b), 1973