Accession Number : AD0726562

Title :   The Electronic Nature of Thermal Conduction in Graphite at Very High Temperatures,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s) : Kaspar,Josef

Report Date : 01 JUN 1971

Pagination or Media Count : 31

Abstract : Recent measurements of the thermal diffusivity of graphites at high temperatures revealed that the diffusivity remains essentially constant in the temperature range from 2000 to 3000K. The possibility that this behavior may be due to an ambipolar electronic thermal conduction mechanism at these temperatures is discussed. Electrical resistance measurements indicate that the scattering of carriers is likely to be proportional to the square of the temperature in these regions. This, in turn, leads to large Lorenz numbers of the order of 10(k/e) to the 2nd power, as actually observed. (Author)

Descriptors :   (*GRAPHITE, THERMAL CONDUCTIVITY), HIGH TEMPERATURE, THERMAL DIFFUSION, INTEGRAL EQUATIONS, ELECTRICAL CONDUCTIVITY

Subject Categories : Ceramics, Refractories and Glass

Distribution Statement : APPROVED FOR PUBLIC RELEASE