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Strong Phonon Scattering by Layer Structured PbSnS 2 in PbTe Based Thermoelectric Materials
Author(s) -
He Jiaqing,
Girard Steven N.,
Zheng JinCheng,
Zhao Lidong,
Kanatzidis Mercouri G.,
Dravid Vinayak P.
Publication year - 2012
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201201565
Subject(s) - materials science , thermal conductivity , thermoelectric materials , phonon , condensed matter physics , thermoelectric effect , debye model , lattice (music) , debye , scattering , thermal , transmission electron microscopy , superlattice , nanotechnology , thermodynamics , optoelectronics , composite material , optics , physics , acoustics
The incorporation of PbSnS 2 in PbTe results in a tremendous reduction of the lattice thermal conductivity to 0.8 W/mK at room temperature, a reduction of almost 60% over bulk PbTe. Transmission electron microscopy reveals very high density displacement layers, misfit dislocations, and phase boundaries. Our thermal transport calculations based on modified Debye‐Callaway model, well in agreement with the experimental measurements, reveal that the layer structured PbSnS 2 plays an important role in reducing the lattice thermal conductivity.