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Title: Lattice thermal transport in group II-alloyed PbTe

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.5002587· OSTI ID:1461424
 [1];  [2];  [3]; ORCiD logo [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Northwestern Univ., Evanston, IL (United States)
  3. Northwestern Univ., Evanston, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)

Here, PbTe, one of the most promising thermoelectric materials, has recently demonstrated a thermoelectric figure of merit (ZT) of above 2.0 when alloyed with group II elements. The improvements are due mainly to significant reduction of lattice thermal conductivity (κι), which was in turn attributed to nanoparticle precipitates. However, a fundamental understanding of various phonon scattering mechanisms within the bulk alloy is still lacking. In this work, we apply the newly-developed density-functional-theory-based compressive sensing lattice dynamics approach to model lattice heat transport in PbTe, MTe, and Pb0.94M0.06Te (M = Mg, Ca, Sr, and Ba) and compare our results with experimental measurements, with focus on the strain effect and mass disorder scattering. We find that (1) CaTe, SrTe, and BaTe in the rock-salt structure exhibit much higher kappa(l) than PbTe, while MgTe in the same structure shows anomalously low κι; (2) lattice heat transport of PbTe is extremely sensitive to static strain induced by alloying atoms in solid solution form; (3) mass disorder scattering plays a major role in reducing κι for Mg/Ca/Sr-alloyed PbTe through strongly suppressing the lifetimes of intermediate- and high-frequency phonons, while for Ba-alloyed PbTe, precipitated nanoparticles are also important.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Midwest Integrated Center for Computational Materials (MICCoM); USDOE
Grant/Contract Number:
AC02-06CH11357; 5J-30161-0010A; AC02-05CH11231
OSTI ID:
1461424
Alternate ID(s):
OSTI ID: 1435862
Journal Information:
Applied Physics Letters, Vol. 112, Issue 18; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 25 works
Citation information provided by
Web of Science

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Cited By (5)

Anisotropy of Selected Mechanical Properties of PbTe journal February 2019
Revisiting lattice thermal transport in PbTe: The crucial role of quartic anharmonicity journal August 2018
Anharmonic stabilization and lattice heat transport in rocksalt β -GeTe journal November 2018
Point defects in PbCdTe solid solutions journal February 2020
Compressive sensing lattice dynamics. I. General formalism text January 2018

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