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The Chemical Bond in Inorganic Chemistry$
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I. David Brown

Print publication date: 2016

Print ISBN-13: 9780198742951

Published to Oxford Scholarship Online: November 2016

DOI: 10.1093/acprof:oso/9780198742951.001.0001

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Steric Strain

Steric Strain

Chapter:
(p.203) 11 Steric Strain
Source:
The Chemical Bond in Inorganic Chemistry
Author(s):

I. David Brown

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198742951.003.0011

Steric strain arises when the chemically predicted bond networks cannot be mapped into three-dimensional space (Section 11.1) without stretching or compressing the bonds. Strain is measured by the global instability index, G, or the bond strain index, B, which both provide criteria for stability (Section 11.2). The different ways in which a structure can relax into a less strained form, e.g. through defects or phase transitions, are illustrated by the relaxations observed in La2NiO4 and other compounds (Section 11.3). Strain sometimes results in a superstructure or an incommensurate modulated structure (Section 11.4).

Keywords:   strain, defects, phase transition, modulated structure, instability

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