Non-stoicheiometric Crystals containing Planar Defects

In the following two sections of this Report some of the systems which show this type of structural behaviour are listed and, where data are available, the formation and reactivity of these phases are described. In the final two sections more theoretical 

The literature available and experimental evidence on this subject are not extensive, and much of it concerns the crystallographic shear phases. These of necessity figure prominently in the survey which follows but, in so far as is possible, generalizations to other systems will be made. To some extent, therefore, the present review is a continuation and extension of two earlier review articles which have appeared in this series and which contain much background information to that presented here. 

2 The Crystal Chemistry of some Systems containing Planar Faults 

Anderson in Surface and Defect Properties of Solids , ed. M. W. Roberts and J. M. Thomas (Specialist Periodical Reports), The Chemical Society, London, 1972, Vol. 1, p. 1. 

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