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Toward a Unified Approach to the Crystal Chemistry of Aurivillius-Type Compounds.: I. The Structural Model

✍ Scribed by Ph. Boullay; G. Trolliard; D. Mercurio; J.M. Perez-Mato; L. Elcoro

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 537 KB
Volume: 164
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.2001.9471

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✦ Synopsis

A generalized structural model of Aurivillius-type compounds is presented using a 4D superspace group analysis where Aurivillius structures are considered as cation-deficient perovskites with the general formula AB 1Àx O 3 . Being essentially composition independent, the model is valid for any Aurivilliustype compounds where x is the only composition-dependent parameter. The atomic domains representing the atoms in superspace are described by means of crenel functions. For any composition, the conventional space groups can be easily derived from a unique superspace group. This work is supported by a TEM investigation where the continuously variable character of the diffraction diagram indicates that the various stacking sequences can be interpreted in terms of a structural modulation over a common average structure.

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