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Excitation Processes In Ceramics And The Anomalous Increase In Thermal Conductivity At Elevated Temperatures

Report Number: WADD TR 60-866
Author: Whitmore, D. H.
Corporate Author: Wright Air Development Division
Laboratory: Materials Central
Date of Publication: 1962-07
Pages: 16
Contract: AF 33(616)-6194
Project: 7022
Task: 73664
AD Number: AD0285283

The problem of the anomalous increase in the observed thermal conductivity of single-phase ceramics at high temperatures has been considered. At temperatures above the onset of this anomalous rise, account has been taken of the possibility that phonon, electronic, and radiative heat transfer, as well as transport of thermal energy by electron-hole pairs, excitons and dissociated gas molecules, may operate simultaneously and individually contribute significantly to the total heat flow. On the basis of reliable conductivity data on monocrystals of single-phase ceramics, estimations have been made on the magnitudes of these high-temperature components which reveal that excited states of low excitation energy may occur in certain ceramics. In these instances, such excited energy-carrying states are able to diffuse down the temperature gradient in the specimen thereby producing a non-negligible contribution to its observed thermal conductivity.

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