Chen Wei Li

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D. S. Kim,1,* H. L. Smith,1 J. L. Niedziela,2 C. W. Li,3 D. L. Abernathy,4 and B. Fultz1 1Department of Applied Physics and Materials Science, California Institute of Technology, Pasadena, California 91125, USA 2Instrument and Source Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA 3Materials Science and Technology Division, Oak(More)
Phase competition underlies many remarkable and technologically important phenomena in transition metal oxides. Vanadium dioxide (VO2) exhibits a first-order metal-insulator transition (MIT) near room temperature, where conductivity is suppressed and the lattice changes from tetragonal to monoclinic on cooling. Ongoing attempts to explain this coupled(More)
Cubic scandium trifluoride (ScF3) has a large negative thermal expansion over a wide range of temperatures. Inelastic neutron scattering experiments were performed to study the temperature dependence of the lattice dynamics of ScF3 from 7 to 750 K. The measured phonon densities of states show a large anharmonic contribution with a thermal stiffening of(More)
Tian Lan,1,* Chen W. Li,2 J. L. Niedziela,2 Hillary Smith,1 Douglas L. Abernathy,2 George R. Rossman,3 and Brent Fultz1 1Department of Applied Physics and Materials Science, California Institute of Technology, Pasadena, California 91125, USA 2Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA 3Division of Geological and Planetary Sciences,(More)
Vibrational studies of materials at elevated temperatures are relatively rare, and most phonon work also has emphasized harmonic behavior. Non-harmonic effects are often unexplored. These non-harmonic effects can be important for many properties of the material, such as thermal transport and phase stability. Phonon theory and computational methods are(More)
Inelastic neutron scattering and nuclear resonant inelastic x-ray scattering were used to measure phonon spectra of FeV as a B2 ordered compound and as a bcc solid solution. The two data sets were combined to give an accurate phonon density of states, and the phonon partial densities of states for V and Fe atoms. Contrary to the behavior of ordering alloys(More)
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C. W. Li,1,2,* H. L. Smith,2 T. Lan,2 J. L. Niedziela,3 J. A. Muñoz,2 J. B. Keith,2 L. Mauger,2 D. L. Abernathy,4 and B. Fultz2 1Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA 2Department of Applied Physics and Materials Science, California Institute of Technology, Pasadena, California, 91125, USA(More)
Raman spectra of rutile tin dioxide (SnO2) were measured at temperatures from 83 to 873 K. The pure anharmonicity from phonon-phonon interactions was found to be large and comparable to the quasiharmonicity. First-principles calculations of phonon dispersions were used to assess the kinematics of three-phonon and four-phonon processes. These kinematics were(More)
in bcc Fe–Co alloys M. S. Lucas, J. A. Muñoz, L. Mauger, Chen W. Li, A. O. Sheets, Z. Turgut, J. Horwath, D. L. Abernathy, M. B. Stone, O. Delaire, Yuming Xiao, and B. Fultz Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433, USA UTC Inc., 1270 North Fairfield Road, Dayton, Ohio 45432, USA W. M. Keck Laboratory, California Institute of(More)