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Role of additives in enhancing the thermal conductivity of AlN ceramics

A AlShaikhi and G P Srivastava

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The thermal conductivity of AlN ceramics with different amounts of Y2O3 as sintering additive has been calculated at low, intermediate and high temperatures by applying the Callaway theory and using a detailed account of three-phonon scattering processes. By making a quantitative analysis of the results, it is found that the increase in the room-temperature conductivity due to the addition of Y2O3 is largely attributed to the decrease in the oxygen impurities level in the AlN crystal. In addition to matching the experimental measurements (available in a limited temperature range) our theoretical work predicts the resulting thermal conductivity over a large temperature range.


PACS

66.70.-f Nonelectronic thermal conduction and heat-pulse propagation in solids; thermal waves

63.20.K- Phonon interactions

81.20.Ev Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation

61.72.J- Point defects and defect clusters

Subjects

Condensed matter: structural, mechanical & thermal

Dates

Issue 18 (21 September 2008)

Received 2 June 2008

Published 28 August 2008



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