Toward a Unified Approach to the Crystal Chemistry of Aurivillius-Type Compounds: II. Bi7Ti4NbO21, a Case Study

In part I of this paper, a generalized structural model of Aurivillius-type compounds has been presented using a 4D superspace group analysis where Aurivillius structures are considered as cation-deficient perovskites with the general formula AB1−xO3. Being essentially composition independent, the m...

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Bibliographic Details
Published in:Journal of solid state chemistry 2002-03, Vol.164 (2), p.261-271
Main Authors: Boullay, Ph, Trolliard, G., Mercurio, D., Perez-Mato, J.M., Elcoro, L.
Format: Article
Language:English
Subjects:
Aurivillius phases
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Inorganic compounds
intergrowth compounds
modulated structures
Physics
Structure of solids and liquids
crystallography
Structure of specific crystalline solids
Water, oxides, hydroxides, peroxides
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Summary:In part I of this paper, a generalized structural model of Aurivillius-type compounds has been presented using a 4D superspace group analysis where Aurivillius structures are considered as cation-deficient perovskites with the general formula AB1−xO3. Being essentially composition independent, the model is valid for any Aurivillius-type compounds where x is the only composition-dependent parameter. For any composition, the conventional space groups can be easily derived from a unique superspace group. In this second part, a practical example of a structural refinement using the superspace approach is presented for the compound Bi7Ti4NbO21 and compared with a conventional 3D refinement. Similarities with other compositionally flexible systems are discussed.
ISSN:0022-4596
1095-726X
DOI:10.1006/jssc.2001.9481