Journal
JOURNAL OF MATERIALS RESEARCH
Volume 17, Issue 11, Pages 2940-2944Publisher
MATERIALS RESEARCH SOCIETY
DOI: 10.1557/JMR.2002.0426
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An AlN ceramic fired at 2173 K for 100 h under a reduced N-2 atmosphere with carbon possessed a room-temperature conductivity of 272 Wm(-1)K(-1), slightly lower than the value for high-purity, single-crystal AlN. However, the thermal conductivity of the ceramic at temperatures below 100 K was much lower than that of single crystal. This is mainly due to phonon scattering by grain junctions that possess an amorphous film with a thickness of under 1 nm. At 500 to 1000 K, no significant difference in the conductivity was observed between the ceramic and the single crystal.
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