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Title: Phonon anharmonicity and negative thermal expansion in SnSe

Journal Article · · Physical Review B
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division; Duke Univ., Durham, NC (United States). Mechanical Engineering and Materials Science Dept.

The anharmonic phonon properties of SnSe in the Pnma phase were investigated with a combination of experiments and first-principles simulations. Using inelastic neutron scattering (INS) and nuclear resonant inelastic X-ray scattering (NRIXS), we have measured the phonon dispersions and density of states (DOS) and their temperature dependence, which revealed a strong, inhomogeneous shift and broadening of the spectrum on warming. First-principles simulations were performed to rationalize these measurements, and to explain the previously reported anisotropic thermal expansion, in particular the negative thermal expansion within the Sn-Se bilayers. Including the anisotropic strain dependence of the phonon free energy, in addition to the electronic ground state energy, is essential to reproduce the negative thermal expansion. From the phonon DOS obtained with INS and additional calorimetry measurements, we quantify the harmonic, dilational, and anharmonic components of the phonon entropy, heat capacity, and free energy. Lastly, the origin of the anharmonic phonon thermodynamics is linked to the electronic structure.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725; AC02-06CH11357; AC02-05CH11231; SC0001299; AC05- 00OR22725
OSTI ID:
1302905
Alternate ID(s):
OSTI ID: 1287766; OSTI ID: 1340000
Journal Information:
Physical Review B, Vol. 94, Issue 5; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 79 works
Citation information provided by
Web of Science

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Cited By (17)

Phase Transformation Contributions to Heat Capacity and Impact on Thermal Diffusivity, Thermal Conductivity, and Thermoelectric Performance journal July 2019
Three-Stage Inter-Orthorhombic Evolution and High Thermoelectric Performance in Ag-Doped Nanolaminar SnSe Polycrystals journal June 2017
High-Temperature Crystal Structure and Chemical Bonding in Thermoelectric Germanium Selenide (GeSe) journal April 2017
Electronic and Thermoelectric Properties of SnSe1−xS x (x = 0, 0.25, 0.5, 0.75, and 1) Alloys: First-Principles Calculations journal April 2018
Colossal barocaloric effects in plastic crystals journal March 2019
Enhancing thermoelectric performance by Fermi level tuning and thermal conductivity degradation in (Ge1−xBix)Te crystals journal June 2019
Anisotropic thermal expansion of SnSe from first-principles calculations based on Grüneisen's theory journal January 2017
Effects of temperature and pressure on the optical and vibrational properties of thermoelectric SnSe journal January 2019
A practical field guide to thermoelectrics: Fundamentals, synthesis, and characterization journal June 2018
Phonon anharmonicity in thermoelectric palladium sulfide by Raman spectroscopy journal July 2018
Thermal expansion in insulating solids from first principles journal November 2019
Lattice thermal conductivity of Bi 2 Te 3 and SnSe using Debye-Callaway and Monte Carlo phonon transport modeling: Application to nanofilms and nanowires journal September 2019
Investigation of the electronic structure and lattice dynamics of the thermoelectric material Na-doped SnSe journal September 2018
Critical mode and band-gap-controlled bipolar thermoelectric properties of SnSe journal August 2018
Critical mode and band-gap-controlled bipolar thermoelectric properties of SnSe text January 2018
Colossal barocaloric effects in plastic crystals text January 2018
Thermal Expansion in Insulating Solids From First Principles text January 2019

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