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Phonon anharmonicity in silicon from 100 to 1500 K

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics
 [1];  [1];  [2];  [3];  [4];  [1]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States). Dept. of Applied Physics and Materials Science
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Instrument and Source Division
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
Inelastic neutron scattering was performed on silicon powder to measure the phonon density of states (DOS) from 100 to 1500 K. The mean fractional energy shifts with temperature of the modes were $$\langle$$ΔεiiΔT$$\rangle$$=₋0.07, giving a mean isobaric Grüneisen parameter of +6.95±0.67, which is significantly different from the isothermal parameter of +0.98. These large effects are beyond the predictions from quasiharmonic models using density functional theory or experimental data, demonstrating large effects from phonon anharmonicity. At 1500 K the anharmonicity contributes 0.15kB/atom to the vibrational entropy, compared to 0.03kB/atom from quasiharmonicity. Lastly, excellent agreement was found between the entropy from phonon DOS measurements and the reference NIST-JANAF thermodynamic entropy from calorimetric measurements.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC05-00OR22725; FG02-03ER46055
OSTI ID:
1185765
Alternate ID(s):
OSTI ID: 1180194
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 1 Vol. 91; ISSN 1098-0121
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

Thermal conductivity of strained silicon: Molecular dynamics insight and kinetic theory approach journal August 2019
Super-resolution energy spectra from neutron direct-geometry spectrometers journal October 2019
Nuclear quantum effect with pure anharmonicity and the anomalous thermal expansion of silicon journal February 2018
Temperature dependence of phonons in FeGe 2 journal October 2018
A nuclear quantum effect with pure anharmonicity and the anomalous thermal expansion of silicon text January 2016
Thermal conductivity of strained silicon: molecular dynamics insight and kinetic theory approach text January 2019

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