Abstract
The thermal conductivity of both LEO and HVPE single crystals of GaN have been meassured over the temperature range of 60 K to 300 K using an electrical third harmonic technique. In contrast to the previously reported results of Sichel and Pankove, the thermal conductivity increases with decreasing temperature below room temperature, reaches a maximum and then decreases with further decreases in temperature. The thermal conductivity of the LEO-GaN is higher at all temperatures than the HVPE materials. The higher thermal conductivity is correlated with lower values of the threading dislocation density.
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