Niedziela, J L; Bansal, D; Ding, J; Lanigan-Atkins, T; Li, Chen; May, A F; Wang, H; Lin, J Y Y; Abernathy, D L; Ehlers, G; Huq, A; Parshall, D; Lynn, J W; Delaire, O Controlling phonon lifetimes via sublattice disordering in AgBiSe2 Journal Article Phys. Rev. Materials, 4 , pp. 105402, 2020. Abstract | Links | BibTeX | Tags: lattice dynamics, phonon, thermal transport @article{Delaire2020, title = {Controlling phonon lifetimes via sublattice disordering in AgBiSe2}, author = {J. L. Niedziela and D. Bansal and J. Ding and T. Lanigan-Atkins and Chen Li and A. F. May and H. Wang and J. Y. Y. Lin and D. L. Abernathy and G. Ehlers and A. Huq and D. Parshall and J. W. Lynn and O. Delaire}, url = {https://journals.aps.org/prmaterials/abstract/10.1103/PhysRevMaterials.4.105402}, doi = {10.1103/PhysRevMaterials.4.105402}, year = {2020}, date = {2020-08-04}, journal = {Phys. Rev. Materials}, volume = {4}, pages = {105402}, abstract = {Understanding and controlling microscopic heat transfer mechanisms in solids is critical to material design in numerous technological applications. Yet, the current understanding of thermal transport in semiconductors and insulators is limited by the difficulty in directly measuring individual phonon lifetimes and mean free paths, and studying their dependence on the microscopic state of the material. Here we report our measurements of microscopic phonon scattering rates in AgBiSe2, which exhibits a controllable, reversible change directly linked to microstructure evolution near a reversible structural phase transition, that directly impacts the thermal conductivity. We demonstrate a steplike doubling of phonon scattering rates resultant from the cation disordering at the structural transition. To rationalize the neutron scattering data, we leverage a stepwise approach to account for alterations to the thermal conductivity that are imparted by distinct scattering mechanisms. These results highlight the potential of tunable microstructures housed in a stable crystal matrix to provide a practical route to tailor phonon scattering to optimize thermal transport properties.}, keywords = {lattice dynamics, phonon, thermal transport}, pubstate = {published}, tppubtype = {article} } Understanding and controlling microscopic heat transfer mechanisms in solids is critical to material design in numerous technological applications. Yet, the current understanding of thermal transport in semiconductors and insulators is limited by the difficulty in directly measuring individual phonon lifetimes and mean free paths, and studying their dependence on the microscopic state of the material. Here we report our measurements of microscopic phonon scattering rates in AgBiSe2, which exhibits a controllable, reversible change directly linked to microstructure evolution near a reversible structural phase transition, that directly impacts the thermal conductivity. We demonstrate a steplike doubling of phonon scattering rates resultant from the cation disordering at the structural transition. To rationalize the neutron scattering data, we leverage a stepwise approach to account for alterations to the thermal conductivity that are imparted by distinct scattering mechanisms. These results highlight the potential of tunable microstructures housed in a stable crystal matrix to provide a practical route to tailor phonon scattering to optimize thermal transport properties. |
Sun, Qiyang; Li, Chen W Exploring nanoscale heat transport via neutron scattering Book Chapter Liao, Bolin (Ed.): pp. 11-1~14, 2020, ISBN: 978-0-7503-1736-8. Abstract | Links | BibTeX | Tags: lattice dynamics, phonon, thermal transport @inbook{Sun2020, title = {Exploring nanoscale heat transport via neutron scattering}, author = {Qiyang Sun and Chen W. Li}, editor = {Bolin Liao}, url = {https://iopscience.iop.org/book/978-0-7503-1738-2}, isbn = {978-0-7503-1736-8}, year = {2020}, date = {2020-03-01}, pages = {11-1~14}, abstract = {Nanoscale Energy Transport Emerging phenomena, methods and applications This book brings together leading names in the field of nanoscale energy transport to provide a comprehensive and insightful review of this developing topic. The text covers new developments in the scientific basis and the practical relevance of nanoscale energy transport, highlighting the emerging effects at the nanoscale that qualitatively differ from those at the macroscopic scale. Throughout the book, microscopic energy carriers are discussed, including photons, electrons and magnons. State-of-the-art computational and experimental nanoscale energy transport methods are reviewed, and a broad range of materials system topics are considered, from interfaces and molecular junctions to nanostructured bulk materials. Nanoscale Energy Transport is a valuable reference for researchers in physics, materials, mechanical and electrical engineering, and it provides an excellent resource for graduate students.}, keywords = {lattice dynamics, phonon, thermal transport}, pubstate = {published}, tppubtype = {inbook} } Nanoscale Energy Transport Emerging phenomena, methods and applications This book brings together leading names in the field of nanoscale energy transport to provide a comprehensive and insightful review of this developing topic. The text covers new developments in the scientific basis and the practical relevance of nanoscale energy transport, highlighting the emerging effects at the nanoscale that qualitatively differ from those at the macroscopic scale. Throughout the book, microscopic energy carriers are discussed, including photons, electrons and magnons. State-of-the-art computational and experimental nanoscale energy transport methods are reviewed, and a broad range of materials system topics are considered, from interfaces and molecular junctions to nanostructured bulk materials. Nanoscale Energy Transport is a valuable reference for researchers in physics, materials, mechanical and electrical engineering, and it provides an excellent resource for graduate students. |
Bansal, D; Li, Chen W; Said, Ayman H; Abernathy, Douglas L; Yan, Jiaqiang; Delaire, Olivier Electron-phonon coupling and thermal transport in the thermoelectric compound Mo3 Sb7−x Te x Journal Article Physical Review B, 92 , pp. 214301, 2015. Abstract | Links | BibTeX | Tags: electron-phonon coupling, phonon, thermal transport @article{Bansal2015, title = {Electron-phonon coupling and thermal transport in the thermoelectric compound Mo3 Sb7−x Te x}, author = {D. Bansal and Chen W. Li and Ayman H. Said and Douglas L. Abernathy and Jiaqiang Yan and Olivier Delaire}, url = {https://journals.aps.org/prb/abstract/10.1103/PhysRevB.92.214301}, doi = {10.1103/PhysRevB.92.214301}, year = {2015}, date = {2015-12-07}, journal = {Physical Review B}, volume = {92}, pages = {214301}, abstract = {Phonon properties of Mo3 Sb7−x Tex (x = 0,1.5,1.7), a potential high-temperature thermoelectric material, have been studied with inelastic neutron and x-ray scattering, and with first-principles simulations. The substitution of Te for Sb leads to pronounced changes in the electronic structure, local bonding, phonon density of states, dispersions, and phonon lifetimes. Alloying with tellurium shifts the Fermi level upward, near the top of the valence band, resulting in a strong suppression of electron-phonon screening and a large overall stiffening of interatomic force constants. The suppression in electron-phonon coupling concomitantly increases group velocities and suppresses phonon scattering rates, surpassing the effects of alloy-disorder scattering and resulting in a surprising increased lattice thermal conductivity in the alloy. We also identify that the local bonding environment changes nonuniformly around different atoms, leading to variable perturbation strengths for different optical phonon branches. Changes in phonon group velocities and phonon scattering rates are quantified, highlighting the large effect of electron-phonon coupling in this compound.}, keywords = {electron-phonon coupling, phonon, thermal transport}, pubstate = {published}, tppubtype = {article} } Phonon properties of Mo3 Sb7−x Tex (x = 0,1.5,1.7), a potential high-temperature thermoelectric material, have been studied with inelastic neutron and x-ray scattering, and with first-principles simulations. The substitution of Te for Sb leads to pronounced changes in the electronic structure, local bonding, phonon density of states, dispersions, and phonon lifetimes. Alloying with tellurium shifts the Fermi level upward, near the top of the valence band, resulting in a strong suppression of electron-phonon screening and a large overall stiffening of interatomic force constants. The suppression in electron-phonon coupling concomitantly increases group velocities and suppresses phonon scattering rates, surpassing the effects of alloy-disorder scattering and resulting in a surprising increased lattice thermal conductivity in the alloy. We also identify that the local bonding environment changes nonuniformly around different atoms, leading to variable perturbation strengths for different optical phonon branches. Changes in phonon group velocities and phonon scattering rates are quantified, highlighting the large effect of electron-phonon coupling in this compound. |
Bansal, D; Li, Chen W; Said, A H; Abernathy, D L; Yan, J Electron-phonon coupling and thermal transport in the thermoelectric compound Mo3Sb7−xTex Journal Article Physical Review B, 92 (21), pp. 214301, 2015. Links | BibTeX | Tags: electron-phonon coupling, phonon, thermal transport, thermoelectric @article{bansal_electron-phonon_2015-2, title = {Electron-phonon coupling and thermal transport in the thermoelectric compound Mo3Sb7−xTex}, author = {D Bansal and Chen W Li and A H Said and D L Abernathy and J Yan}, url = {https://link.aps.org/doi/10.1103/PhysRevB.92.214301}, doi = {10.1103/PhysRevB.92.214301}, year = {2015}, date = {2015-01-01}, journal = {Physical Review B}, volume = {92}, number = {21}, pages = {214301}, keywords = {electron-phonon coupling, phonon, thermal transport, thermoelectric}, pubstate = {published}, tppubtype = {article} } |
Controlling phonon lifetimes via sublattice disordering in AgBiSe2 Journal Article Phys. Rev. Materials, 4 , pp. 105402, 2020. |
Exploring nanoscale heat transport via neutron scattering Book Chapter Liao, Bolin (Ed.): pp. 11-1~14, 2020, ISBN: 978-0-7503-1736-8. |
Electron-phonon coupling and thermal transport in the thermoelectric compound Mo3 Sb7−x Te x Journal Article Physical Review B, 92 , pp. 214301, 2015. |
Electron-phonon coupling and thermal transport in the thermoelectric compound Mo3Sb7−xTex Journal Article Physical Review B, 92 (21), pp. 214301, 2015. |