|
|||||
|
|
The inherent displacive flexibility of the hexacelsian tetrahedral framework and its relationship to polymorphism in Ba-hexacelsian |
|
| Authors: | R L Withers Y Tabira J A Valgoma M Aroyo M T Dove |
| Institution: | (1) Research School of Chemistry, Australian National University, Canberra, ACT, 0200, Australia e-mail: withers@rsc.anu.edu.au Fax: +61 2 62490750, AU;(2) Departamento de Fisica de la Materia Condensada, Universidad del Pais Vasco, Bilbao, Spain, ES;(3) Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK, GB |
| Abstract: | The results of a rigid unit mode (RUM) analysis of the inherent displacive structural flexibility of the tetrahedral framework of the ideal hexacelsian structure type are presented. One of the three types of RUM found to exist is characterized by modulation wave vectors perpendicular to <110> and atomic displacement patterns involving tetrahedral rotation around the parent c axis while a second type of RUM is found to be soft at any modulation wave vector and to involve tetrahedral rotation about in-plane rotation axes. It is shown how a combination of these two types of RUM motion associated with the same q=1/2<1ˉ101>* modulation wave vector enables the outstanding crystal chemical problems and apparently mutually contradictory results as regards polymorphism in Ba-hexacelsian to be resolved. Received: 30 December 1999 / Accepted: 16 May 2000 |
| Keywords: | Hexacelsian Phase transition Diffuse distribution Dynamical disorder Correlated tetrahedral rotation |
| 本文献已被 SpringerLink 等数据库收录！ | |