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Misorientation dependence of Al2O3 grain boundary thermal resistance
- Source :
- Applied Physics Letters. 102:034101
- Publication Year :
- 2013
- Publisher :
- AIP Publishing, 2013.
-
Abstract
- The room-temperature thermal resistance of model low-angle (0001) twist bicrystal Al2O3 grain boundaries was measured as a function of misorientation angle using the 3ω thermal conductivity testing technique. The work yields interfacial thermal resistances of 0.44 × 10−8, 1.2 × 10−8, and 1.54 × 10−8 Km2 W−1 for the ∼1.3°, ∼8.0°, and ∼13° twist grain boundaries, respectively. The interfacial thermal resistance correlates with the grain boundary energy calculated from the Read-Shockley model. The results indicate significant anisotropy in the Kapitza resistance whose magnitude is dominated by local structural defects at the grain boundary rather than spectral mismatch between grains.
Details
- ISSN :
- 10773118 and 00036951
- Volume :
- 102
- Database :
- OpenAIRE
- Journal :
- Applied Physics Letters
- Accession number :
- edsair.doi...........046a4fa8a873917c54fa53f3b2a911c4