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.
PAC, 1994, 66, 577
(Definitions of terms relating to phase transitions of the solid state (IUPAC Recommendations
on page 592
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