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The Chemical Bond in Inorganic ChemistryThe Bond Valence Model$
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I. David Brown

Print publication date: 2006

Print ISBN-13: 9780199298815

Published to Oxford Scholarship Online: January 2010

DOI: 10.1093/acprof:oso/9780199298815.001.0001

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Lattice-induced strain

Lattice-induced strain

(p.164) 12 Lattice-induced strain
The Chemical Bond in Inorganic Chemistry

I. David Brown

Oxford University Press

Once the bond network is known, ideal bond lengths can be calculated from the theoretical bond valences described in Chapter 3, but these cannot always be embedded in three-dimensional space without being stretched or compressed. The degree of strain can be measured using the bond strain index and the global instability index, the latter being less than 0.20 valence units in stable structures. Various mechanisms allow at least a partial relaxation of this strain, and these can lead to phase transitions and incommensurate structures.

Keywords:   compressed, stretched, ideal bond length, bond strain index, global instability index, phase transitions, incommensurate structure

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