Details

Autor(en) / Beteiligte

• Fricke, J.
• Hofmann, Dieter
• Hofmann, R.
• Eckstein, Robert
• Mehling, H.
• Nilsson, O.
• Müller, Stephan G.
• Horn, R.

Titel

Experimental and Theoretical Analysis of the High Temperature Thermal Conductivity of Monocrystalline SiC

Ist Teil von

• Materials science forum, 1998-02, Vol.264-268, p.623-626

Ort / Verlag

Trans Tech Publications Ltd

Erscheinungsjahr

1998

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The thermal properties of monocrystalline 6H-SiC have been studied within the temperature range 300-2300 K. The thermal diffusivity a was measured with the laserflash method up to 2300 K. The specific heat capacity cp was determined from room temperature up to 1650 K. From thermal diffusivity data, the cp data fitted by the Debye-model and the density rho taken partly from measurements and partly from literature the thermal conductivity kappa was evaluated. The theoretical analysis of the given high-temperature thermal conductivity data and of low temperature data taken from literature shows, that the phonon contribution is dominant within the whole temperature range. Within a Callaway analysis a Grueneisen-parameter gamma = 1.5 was found. Unipolar and bipolar electronic contributions to the thermal conductivity seem to be negligible. At temperatures of 1500 K and higher additional heat transport by radiation becomes relevant. (Author)