Derivation and calculation of a sequence of lower‐bound results for lattice thermal conductivity
- 1 September 1976
- journal article
- research article
- Published by Wiley in Physica Status Solidi (b)
- Vol. 77 (1) , 131-140
- https://doi.org/10.1002/pssb.2220770111
Abstract
Better variational lower bounds are derived as approximate solutions of a linearized Boltzmann equation for phonons. The role of the off‐diagonal part of the linearized phonon collision operator is considered in the frame of B displaced Planck distribution for phonons. A result derived here can be expressed in terms of the Debye term and the Ziman‐limit conductivity result‐showing that the Debye term is the “zeroth approximation” of that variational lower bound.Keywords
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