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Crystal Structure AnalysisPrinciples and Practice$
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William Clegg, Alexander J Blake, Jacqueline M Cole, John S O Evans, Peter Main, Simon Parsons, and David J Watkin

Print publication date: 2009

Print ISBN-13: 9780199219469

Published to Oxford Scholarship Online: September 2009

DOI: 10.1093/acprof:oso/9780199219469.001.0001

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Introduction to twinning

Introduction to twinning

(p.271) 18 Introduction to twinning
Crystal Structure Analysis

Simon Parsons

Oxford University Press

This chapter presents a simple model for twinning, the occurrence of more than one orientation of a structure with a rational relationship in a crystal. Characterization of a two-component twin requires a twin law and a twin fraction; common examples of twin laws are discussed, together with possible extension to multiple twins. Twinning affects diffraction patterns in various ways, with full or partial overlap of some or all reflections from the twin components. Different types of twinning include inversion, merohedral, pseudo-merohedral (overlap of all reflections), and non-merohedral (some overlap). Methods of handling twins in practice are described, including how to derive the twin law, some common signs of twinning, and detailed applications in a number of examples.

Keywords:   twinning, twin law, twin fraction, inversion twin, merohedral twin, pseudo-merohedral twin, non-merohedral twin

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