Misorientation dependence of Al2O3 grain boundary thermal resistance

Kaiping Tai, Abigail Lawrence, Martin P. Harmer, Shen J. Dillon

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish (US)
Article number034101
JournalApplied Physics Letters
Volume102
Issue number3
DOIs
StatePublished - Jan 21 2013

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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