Order and disorder in solid oxygen: Neutron scattering investigations
Solid oxygen exists at zero pressure in three crystallographic phases, denoted α, β, γ. Various results have been obtained by neutron scattering in the two disordered β and у phases. Plastic γ-O₂ has a A15 structure with 8 molecules per unit cell. The molecules, located at 2α and 6c sites, exhibit t...
Збережено в:
| Опубліковано в: : | Физика низких температур |
|---|---|
| Дата: | 1996 |
| Автори: | , , , , |
| Формат: | Стаття |
| Мова: | Англійська |
| Опубліковано: |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
1996
|
| Теми: | |
| Онлайн доступ: | https://nasplib.isofts.kiev.ua/handle/123456789/176427 |
| Теги: |
Додати тег
Немає тегів, Будьте першим, хто поставить тег для цього запису!
|
| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Order and disorder in solid oxygen: Neutron scattering investigations / F. Dunstetter, O. Hardouin Duparc, V.P. Plakhty, J. Schweizer, A. Delapalme // Физика низких температур. — 1996. — Т. 22, № 2. — С. 140-157. — Бібліогр.: 44 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1862636007450476544 |
|---|---|
| author | Dunstetter, F. Hardouin Duparc, O. Plakhty, V.P. Schweizer, J. Delapalme, A. |
| author_facet | Dunstetter, F. Hardouin Duparc, O. Plakhty, V.P. Schweizer, J. Delapalme, A. |
| citation_txt | Order and disorder in solid oxygen: Neutron scattering investigations / F. Dunstetter, O. Hardouin Duparc, V.P. Plakhty, J. Schweizer, A. Delapalme // Физика низких температур. — 1996. — Т. 22, № 2. — С. 140-157. — Бібліогр.: 44 назв. — англ. |
| collection | DSpace DC |
| container_title | Физика низких температур |
| description | Solid oxygen exists at zero pressure in three crystallographic phases, denoted α, β, γ. Various results have been obtained by neutron scattering in the two disordered β and у phases. Plastic γ-O₂ has a A15 structure with 8 molecules per unit cell. The molecules, located at 2α and 6c sites, exhibit two different types of disorder of molecular axes: a spherical-like disorder for the 6c molecules, and a disc-like disorder for the 6c molecules. A precise diffraction analysis on large single crystals shows that the disorder of molecular axis of the molecules can be interpreted in terms of localized forbidden orientations, or orientational holes, with a wide disorder among the other orientations. An important contribution of the translation-rotation coupling must be taken into account for the 6c molecules. Analysis of diffuse scattering by both an approximate analytical model and molecular dynamics simulation shows an important contribution to the orientational correlations between 6c-6c and 2a-6c molecules. Magnetic disorder can be investigated by neutron polarization analysis of the paramagnetic scattering. The 3D long range antiferromagnetic order of the α phase becomes a 2D short range helicoidal order in the β phase, with a very short 0.5 nm correlation range. In the γ phase, one observes, as in the liquid, a strong antiferromagnetic correlation, with a suggestion of a ID order along the linear chains of 6c molecules. In all the measured phases, the variation of the scattering intensity with scattering vector q cannot be reproduced at high q by the known magnetic form factor. This suggests the need for a better description of the л orbital and the theoretical magnetic form factor of the molecule.
|
| first_indexed | 2025-11-30T21:10:22Z |
| format | Article |
| fulltext | |
| id | nasplib_isofts_kiev_ua-123456789-176427 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0132-6414 |
| language | English |
| last_indexed | 2025-11-30T21:10:22Z |
| publishDate | 1996 |
| publisher | Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| record_format | dspace |
| spelling | Dunstetter, F. Hardouin Duparc, O. Plakhty, V.P. Schweizer, J. Delapalme, A. 2021-02-04T15:43:01Z 2021-02-04T15:43:01Z 1996 Order and disorder in solid oxygen: Neutron scattering investigations / F. Dunstetter, O. Hardouin Duparc, V.P. Plakhty, J. Schweizer, A. Delapalme // Физика низких температур. — 1996. — Т. 22, № 2. — С. 140-157. — Бібліогр.: 44 назв. — англ. 0132-6414 https://nasplib.isofts.kiev.ua/handle/123456789/176427 Solid oxygen exists at zero pressure in three crystallographic phases, denoted α, β, γ. Various results have been obtained by neutron scattering in the two disordered β and у phases. Plastic γ-O₂ has a A15 structure with 8 molecules per unit cell. The molecules, located at 2α and 6c sites, exhibit two different types of disorder of molecular axes: a spherical-like disorder for the 6c molecules, and a disc-like disorder for the 6c molecules. A precise diffraction analysis on large single crystals shows that the disorder of molecular axis of the molecules can be interpreted in terms of localized forbidden orientations, or orientational holes, with a wide disorder among the other orientations. An important contribution of the translation-rotation coupling must be taken into account for the 6c molecules. Analysis of diffuse scattering by both an approximate analytical model and molecular dynamics simulation shows an important contribution to the orientational correlations between 6c-6c and 2a-6c molecules. Magnetic disorder can be investigated by neutron polarization analysis of the paramagnetic scattering. The 3D long range antiferromagnetic order of the α phase becomes a 2D short range helicoidal order in the β phase, with a very short 0.5 nm correlation range. In the γ phase, one observes, as in the liquid, a strong antiferromagnetic correlation, with a suggestion of a ID order along the linear chains of 6c molecules. In all the measured phases, the variation of the scattering intensity with scattering vector q cannot be reproduced at high q by the known magnetic form factor. This suggests the need for a better description of the л orbital and the theoretical magnetic form factor of the molecule. It is a real pleasure to thank here Prof. Mikhail Strzhemechny from the Verkin Institute for Low Temperature Physics in Kharkov for his critical reading of the manuscript and comments. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Специальный выпуск International Workshop on Cryocrystals and Quantum Crystals (CC-1995) Order and disorder in solid oxygen: Neutron scattering investigations Article published earlier |
| spellingShingle | Order and disorder in solid oxygen: Neutron scattering investigations Dunstetter, F. Hardouin Duparc, O. Plakhty, V.P. Schweizer, J. Delapalme, A. Специальный выпуск International Workshop on Cryocrystals and Quantum Crystals (CC-1995) |
| title | Order and disorder in solid oxygen: Neutron scattering investigations |
| title_full | Order and disorder in solid oxygen: Neutron scattering investigations |
| title_fullStr | Order and disorder in solid oxygen: Neutron scattering investigations |
| title_full_unstemmed | Order and disorder in solid oxygen: Neutron scattering investigations |
| title_short | Order and disorder in solid oxygen: Neutron scattering investigations |
| title_sort | order and disorder in solid oxygen: neutron scattering investigations |
| topic | Специальный выпуск International Workshop on Cryocrystals and Quantum Crystals (CC-1995) |
| topic_facet | Специальный выпуск International Workshop on Cryocrystals and Quantum Crystals (CC-1995) |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/176427 |
| work_keys_str_mv | AT dunstetterf orderanddisorderinsolidoxygenneutronscatteringinvestigations AT hardouinduparco orderanddisorderinsolidoxygenneutronscatteringinvestigations AT plakhtyvp orderanddisorderinsolidoxygenneutronscatteringinvestigations AT schweizerj orderanddisorderinsolidoxygenneutronscatteringinvestigations AT delapalmea orderanddisorderinsolidoxygenneutronscatteringinvestigations |