A transition in which the cell dimensions and/or angles of the one phase differ from
those in the other phase, but where the space-group symmetry is conserved. Example:
The transition of face-centred cubic
Ce, upon cooling, to a face-centred cubic phase that is 10% denser. Upon cooling, enough
contraction takes place to allow an overlap of the
configuration and the change from an isolated non-bonding magnetic f electron to
a bonding non-magnetic electron pair.
Source:
PAC, 1994, 66, 577
(Definitions of terms relating to phase transitions of the solid state (IUPAC Recommendations
1994))
on page 592
Cite as:
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
https://doi.org/10.1351/goldbook.
