2010/11/17 by Changwook Jeong, Jeong, Changwook, Supriyo Datta +3
Engineering · Materials Science · Physics and Astronomy · #Advanced Thermoelectric Materials and Devices #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Thermal Radiation and Cooling Technologies #Thermal properties of materials #cond-mat.mtrl-sci
paper · pdf · doi:10.48550/arxiv.1011.3864
arxiv created 2010/11/17 · openalex publication_date 2010/11/17 · arxiv updated 2010/11/18 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Using a full dispersion description of phonons, the thermal conductivities of bulk Si and Bi2Te3 are evaluated using a Landauer approach and related to the conventional approach based on the Boltzmann transport equation. A procedure to extract a well-defined average phonon mean-free-path from the measured thermal conductivity and given phonon-dispersion is presented. The extracted mean-free-path has strong physical significance and differs greatly from simple estimates. The use of simplified dispersion models for phonons is discussed, and it is shown that two different Debye temperatures must be used to treat the specific heat and thermal conductivity (analogous to the two different effective masses needed to describe the electron density and conductivity). A simple technique to extract these two Debye temperatures is presented and the limitations of the method are discussed.