Quantitative evaluation of the effects of positional versus orientational disorder on the scattering of acoustic phonons in disordered matter
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 mono...
Збережено в:
| Опубліковано в: | Физика низких температур |
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| Дата: | 2007 |
| ISSN: | 0132-6414 |
| Автори: | , , , , , , , , |
| Формат: | Стаття |
| Мова: | Англійська |
| Опубліковано: |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2007
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| Теми: | |
| Онлайн доступ: | https://nasplib.isofts.kiev.ua/handle/123456789/121796 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Quantitative evaluation of the effects of positional versus
 orientational disorder on the scattering of acoustic
 phonons in disordered matter / F.J. Bermejo, R. Fernández-Perea, C. Cabrillo, A.I. Krivchikov, A.N. Yushchenko, V.G. Manzhelii, O.A. Korolyuk, M.A. González, M. Jimenez-Ruiz // Физика низких температур. — 2007. — Т. 33, № 6-7. — С. 790-797. — Бібліогр.: 13 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| Резюме: | 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.
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| ISSN: | 0132-6414 |