Abstract
As discussed in a recent review [1] thermal conductivity [2] and heat pulse [3] experiments have shown the interaction of phonons with grain boundaries to be weak and probably due to anharmonic coupling with the distortion field of the (static) boundary. Theoretical discussions of this mechanism have been based on formulations [4,5] developed before data on third-order elastic constants (TOECs) were available. The aim of the present paper is to analyze the heat pulse experiments of [3] using a theoretical framework[6–8] which, although lacking the attractive simplicity of Klemens approach[4,5], offers an exact description of the anharmonic interaction in terms of TOECs.KeywordsElastic ConstantReflection CoefficientBurger VectorPhonon ScatteringHeat PulseThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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