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Title: Supersonic propagation of lattice energy by phasons in fresnoite

Controlling the thermal energy of lattice vibrations separately from electrons is vital to many applications including electronic devices and thermoelectric energy conversion. To remove heat without shorting electrical connections, heat must be carried in the lattice of electrical insulators. Phonons are limited to the speed of sound, which, compared to the speed of electronic processes, puts a fundamental constraint on thermal management. Here we report a supersonic channel for the propagation of lattice energy in the technologically promising piezoelectric mineral fresnoite (Ba 2TiSi 2O 8) using neutron scattering. Lattice energy propagates 2.8–4.3 times the speed of sound in the form of phasons, which are caused by an incommensurate modulation in the flexible framework structure of fresnoite. Here, the phasons enhance the thermal conductivity by 20% at room temperature and carry lattice-energy signals at speeds beyond the limits of phonons.
Authors:
ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1] ;  [2] ; ORCiD logo [1] ; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Meggitt Sensing Systems, Irvine, CA (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1464018

Manley, Michael E., Stonaha, Paul J., Abernathy, Douglas L., Chi, Songxue, Sahul, Raffi, Hermann, Raphael P., and Budai, John D.. Supersonic propagation of lattice energy by phasons in fresnoite. United States: N. p., Web. doi:10.1038/s41467-018-04229-1.
Manley, Michael E., Stonaha, Paul J., Abernathy, Douglas L., Chi, Songxue, Sahul, Raffi, Hermann, Raphael P., & Budai, John D.. Supersonic propagation of lattice energy by phasons in fresnoite. United States. doi:10.1038/s41467-018-04229-1.
Manley, Michael E., Stonaha, Paul J., Abernathy, Douglas L., Chi, Songxue, Sahul, Raffi, Hermann, Raphael P., and Budai, John D.. 2018. "Supersonic propagation of lattice energy by phasons in fresnoite". United States. doi:10.1038/s41467-018-04229-1. https://www.osti.gov/servlets/purl/1464018.
@article{osti_1464018,
title = {Supersonic propagation of lattice energy by phasons in fresnoite},
author = {Manley, Michael E. and Stonaha, Paul J. and Abernathy, Douglas L. and Chi, Songxue and Sahul, Raffi and Hermann, Raphael P. and Budai, John D.},
abstractNote = {Controlling the thermal energy of lattice vibrations separately from electrons is vital to many applications including electronic devices and thermoelectric energy conversion. To remove heat without shorting electrical connections, heat must be carried in the lattice of electrical insulators. Phonons are limited to the speed of sound, which, compared to the speed of electronic processes, puts a fundamental constraint on thermal management. Here we report a supersonic channel for the propagation of lattice energy in the technologically promising piezoelectric mineral fresnoite (Ba2TiSi2O8) using neutron scattering. Lattice energy propagates 2.8–4.3 times the speed of sound in the form of phasons, which are caused by an incommensurate modulation in the flexible framework structure of fresnoite. Here, the phasons enhance the thermal conductivity by 20% at room temperature and carry lattice-energy signals at speeds beyond the limits of phonons.},
doi = {10.1038/s41467-018-04229-1},
journal = {Nature Communications},
number = 1,
volume = 9,
place = {United States},
year = {2018},
month = {5}
}

Works referenced in this record:

High-Thermoelectric Performance of Nanostructured Bismuth Antimony Telluride Bulk Alloys
journal, May 2008