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Structural Crystallography of Inorganic Oxysalts$
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Sergey V. Krivovichev

Print publication date: 2009

Print ISBN-13: 9780199213207

Published to Oxford Scholarship Online: May 2009

DOI: 10.1093/acprof:oso/9780199213207.001.1

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Alternative approaches to structure description

Alternative approaches to structure description

(p.173) 5 Alternative approaches to structure description
Structural Crystallography of Inorganic Oxysalts

Sergry V. Krivovichev

Oxford University Press

This chapter is devoted to alternative approaches to description of complex structures of inorganic oxysalts. These include, first, treatment in terms of anion-centered polyhedra (either tetrahedra or octahedra). The history of this approach is considered and its effectiveness is demonstrated. Many examples of structural units based upon anion-centered polyhedra are provided (e.g., stella quadrangula and inverted perovskites). The second approach examined is description in terms of cation arrays, this is the most suitable description for structures with large and heavy cations (e.g., lanthanoids). As example, the structural chemistry of rare earth fluoride carbonates is discussed.

Keywords:   anion-centered polyhedra, additional oxygen, inverted perovskites, cation arrays, close-packed arrangements

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