DISTORTIONS OF FRAMEWORK STRUCTURES

Citation
Mt. Dove et al., DISTORTIONS OF FRAMEWORK STRUCTURES, Phase transitions, 58(1-3), 1996, pp. 121-143
Citations number
36
Categorie Soggetti
Crystallography,"Physics, Condensed Matter
Journal title
ISSN journal
01411594
Volume
58
Issue
1-3
Year of publication
1996
Part
B
Pages
121 - 143
Database
ISI
SICI code
0141-1594(1996)58:1-3<121:DOFS>2.0.ZU;2-4
Abstract
We review the ''Rigid Unit Mode'' model that was developed to explain a number of features of framework silicate crystals composed of linked tetrahedral units, but which has implications also for the stability of perovskite structures if the octahedra have some degree of rigidity . The discussion includes the constraints on possible modes of deforma tion, experimental validation of the model, implications for the local structure of high-temperature phases, the local structures of defects , and the relationship to the soft-mode theory of displacive phase tra nsitions.