A transition in which the crystal structure is dilated (or compressed) along one (or
more) crystallographic direction(s) while the symmetry about that direction is retained.
The transition of a CsCl-type structure to a rock salt structure in which dilation occurs along the three-fold axis.
The transition at in quenched NiS
in which volume expansion occurs without change of symmetry on going from a metallic
state () to a semiconducting state ().
PAC, 1994, 66, 577
(Definitions of terms relating to phase transitions of the solid state (IUPAC Recommendations
on page 581
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. doi:10.1351/goldbook