Volume 36, Number 7, December I 1996
|Page(s)||515 - 520|
|Section||Condensed matter: structure, thermal and mechanical properties|
|Published online||01 September 2002|
High-order diffraction satellites in Rb2ZnCl4: Experimental evidence against overall phason thermal factors
Departamento de Física Aplicada I, Escuela Técnica Superior
de Ingenieros, Industriales y de Telecomunicación, Universidad del País Vasco,
Alameda de Urquijo s/n, 48013 Bilbao, Spain
2 Departamento de Física de la Materia Condensada, Facultad de Ciencias Universidad del País Vasco - Apdo. 644, 48080 Bilbao, Spain
3 Laboratoire de Chimie-Physique du Solide (UA 453), Ecole Centrale - 92295 Châtenay-Malabry-Cédex, France
4 Departamento de Física Aplicada II, Facultad de Ciencias, Universidad del País Vasco - Apdo. 644, 48080 Bilbao, Spain
Accepted: 21 October 1996
The temperature dependence of the diffraction pattern in the in com men su ra te phase of can be explained by the temperature variation of 3 structural parameters: the amplitude of the primary mode of symmetry, the soliton density defining its anharmonicity, and the amplitude of a third harmonic modulation. The addition of overall phason thermal factors is shown to be inconsistent with the experimental data which include fifth- and seventh-order satellites. It is further demonstrated that the use, in conventional structural analysis, of an incomplete structural model with null or small anharmonicity, together with a reduced dataset lacking higher-order weak satellites, may lead to the successful refinement of a phason thermal factor, which has a spurious character.
PACS: 64.70.Rh – Commensurate-incommensurate transitions / 61.10.-i – X-ray diffraction and scattering / 65.90.+i – Other topics in thermal properties of condensed matter
© EDP Sciences, 1996
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.