THERMAL CONDUCTIVITY OF PURE AND IMPURE INDIUM ANTIMONIDE AT LOW TEMPERATURES.
SOUTH DAKOTA SCHOOL OF MINES AND TECHNOLOGY RAPID CITY DEPT OF PHYSICS
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The thermal conductivity of pure and impure InSb was measured in the temperature range 77-300K. The samples were placed between two Armco-iron standards. Copper-constantan thermocouples were attached to the standard-sample-standard combination to monitor temperatures at various points of the sandwich. To increase confidence in the data, the 77-300K range was covered twice for each sample. Computer-assisted data processing was used to reduce the possibility of human error. The thermal conductivity of both samples decreased with increasing temperatures. Values of 1480 mWcm deg K AT K and 174 mWcm deg K at 303K were determined for the thermal conductivity of the pure InSb sample. Values of 370 mWcm deg K at 79K and 77 mWcm deg K at 302K were determined for the thermal conductivity of the impure InSb sample. The thermal conductivity plot for the impure InSb sample was fitted with a theoretical curve calculated on the basis of Hollands modification of the Callaway analysis. The model included boundary scattering, impurity scattering, and phonon-phonon scattering. The magnitude of the electron-phonon scattering term was estimated. Impurity and possibly electron-phonon scattering can be held responsible for the lower thermal conductivity of the impure sample. Author
- Solid State Physics