Details

Autor(en) / Beteiligte

• Geng, Huiyuan
• Meng, Xianfu
• Zhang, Hao
• Zhang, Jian

Titel

Lattice thermal conductivity of filled skutterudites: An anharmonicity perspective

Ist Teil von

• Journal of applied physics, 2014-10, Vol.116 (16)

Ort / Verlag

Melville: American Institute of Physics

Erscheinungsjahr

2014

Quelle

AIP Journals (American Institute of Physics)

Beschreibungen/Notizen

• We report a phenomenological model to calculate the high-temperature lattice thermal conductivity of filled skutterudite antimonides. The model needs no phonon resonant scattering terms. Instead, we assume that umklapp processes dominate the high-temperature phonon scattering. In order to represent the anharmonicity introduced by the filling atom, we introduce a Gaussian term into the relaxation time of the umklapp process. The developed model agrees remarkably well with the experimental results of REfCo4Sb12 and REfFe4Sb12 (RE = Yb, Ba, and Ca) alloys. To further test the validity of our model, we calculate the lattice thermal conductivity of nanostructured or multi-filled skutterudites. The calculation results are also in good agreement with experiment, increasing our confidence in the developed anharmonicity model.