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- Title
The role of the coordination defect (CD) in the structures of anion-deficient, fluorite-related compounds.
- Authors
Bevan, D. J. M.; Martin, Lisandra L.; Martin, Raymond L.
- Abstract
The various superstructure phases that occur with the anion-deficient compositions of binary oxides MO2 − x with the fluorite structure as parent are explored here in terms of the original `coordination defect' (or CD) concept in which each vacant oxygen site, □, is `coordinated' by six O atoms thereby creating the octahedral `structure-determining' entity [ M3.5□O6]. It emerges that the structure and composition of each anion-deficient (polymorph) phase can be described in terms of crystallographic `motifs' which comprise sets of parallel coplanar polygons based on ½〈210〉F and ½〈111〉F CD linkages.
- Subjects
COMPLEX compounds; CRYSTAL defects; ANIONS; CALCIUM fluoride; STRUCTURAL analysis (Engineering)
- Publication
Acta Crystallographica Section B: Structural Science, Crystal Engineering & Materials, 2013, Vol 69, Issue 1, p17
- ISSN
2052-5192
- Publication type
Article
- DOI
10.1107/S205251921205110X