Quantitative evaluation of the effects of positional versus orientational disorder on the scattering of acoustic phonons in disordered matter

Related Topics

Автор(и)

  • F.J. Bermejo Instituto de Estructura de la Materia, CSIC, and Dept. Electricidad y Electrуnica-Unidad Asociada CSIC, Facultad de Ciencia y Tecnologнa, Universidad del Paнs Vasco / EHU, P.O. Box 644, Bilbao E-48080, Spain
  • R. Fernández-Perea Instituto de Estructura de la Materia, CSIC, and Dept. Electricidad y Electrуnica-Unidad Asociada CSIC, Facultad de Ciencia y Tecnologнa, Universidad del Paнs Vasco / EHU, P.O. Box 644, Bilbao E-48080, Spain
  • C. Cabrillo Instituto de Estructura de la Materia, CSIC, and Dept. Electricidad y Electrуnica-Unidad Asociada CSIC, Facultad de Ciencia y Tecnologнa, Universidad del Paнs Vasco / EHU, P.O. Box 644, Bilbao E-48080, Spain
  • A.I. Krivchikov B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine
  • A.N. Yushchenko B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine
  • V.G. Manzhelii B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine
  • O.A. Korolyuk B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine
  • M.A. González Institute Laue Langevin, 6 Rue Jules Horowitz, Grenoble F-38042, Cedex 9, France
  • M. Jimenez-Ruiz Institute Laue Langevin, 6 Rue Jules Horowitz, Grenoble F-38042, Cedex 9, France

DOI:

https://doi.org/10.1063/1.2755202

Ключові слова:

thermal conductivity, phonon, light, neutron, scattering, solid ethanol.

Анотація

The phonon scattering processes in the three solid phases of ethanol are investigated using thermal conductivity, light, and neutron-scattering measurements as well as molecular dynamics simulations on single- crystalline models for two crystalline modifications (fully ordered monoclinic and orientationally disordered bcc phases). The orientationally disordered crystal is found to exhibit a temperature dependence of the thermal conductivity that is remarkably close to that of a structurally disordered solid, especially at low temperatures. This results, together with measurements of Brillouin linewidths as derived from light scattering measurements, emphasize the role of orientational disorder in phonon scattering. The experimental results obtained on polycrystal samples are then discussed with the aid of computer simulations on single-crystalline models of both bcc and monoclinic crystals. Our findings are in good agreement with the wealth of thermodynamic and dynamic data available so far, but at variance with the inferences drawn from inelastic x-ray data on polycrystalline samples, where a common nature for the excitations in all phases is postulated.

Завантаження

Дані завантаження ще не доступні.

Downloads

Опубліковано

2007-05-30

Як цитувати

(1)
Bermejo, F.; Fernández-Perea, R.; Cabrillo, C.; Krivchikov, A.; Yushchenko, A.; Manzhelii, V.; Korolyuk, O.; González, M.; Jimenez-Ruiz, M. Quantitative Evaluation of the Effects of Positional Versus Orientational Disorder on the Scattering of Acoustic Phonons in Disordered Matter: Related Topics. Fiz. Nizk. Temp. 2007, 33, 790-797.

Номер

Розділ

Статті

Статті цього автора (авторів), які найбільше читають

<< < 1 2 3 4 5 6 7 > >>