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Modular Structures
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Book Chapter
Modular Structures
2016
Overview
Many phases related to the perovskite structure are modular in nature, being built from slabs of a parent perovskite interleaved with other structures. These phases are able to accommodate composition change by changing the thickness of the perovskite units or the inter‐slab species. This chapter summarises the structural relationships between four important series, excluding the superconducting cuprates. The Aurivillius phases contain slabs of perovskite sliced along the ideal [100]direction. They are formed by replacement of the interlayer A
2
structures in the Ruddlesden‐Popper phases and A' in the Dion‐Jacobson phases with a layer of composition Bi
2
O
2
. Structures are often given similar but different space groups, and in some cases it is deemed best to described the structures as incommensurate modulated forms. The phases related to Ca
2
Nb
2
O
7
are built from slabs of the perovskite structure, this time cut into slabs parallel to ideal perovskite [110]
p
planes.
Publisher
John Wiley & Sons, Ltd
Subject
ISBN
9781118935668, 1118935667
