Preferred Label : displacive transition;
IUPAC definition : A transition in which a displacement of one or more kinds of atoms or ions in a crystal
structure changes the lengths and/or directions of bonds, without severing the primary
bonds. Examples: The transitions of the low-temperature polymorphs of SiO sub 2 /sub
(quartz, tridymite and cristobalite) to their respective high-temperature polymorphs,
which involve distortions or rotations of the SiO sub 4 /sub tetrahedra. Also Jahn–Teller
and ferroic transitions.;
Origin ID : D01798;
See also
A transition in which a displacement of one or more kinds of atoms or ions in a crystal
structure changes the lengths and/or directions of bonds, without severing the primary
bonds. Examples: The transitions of the low-temperature polymorphs of SiO sub 2 /sub
(quartz, tridymite and cristobalite) to their respective high-temperature polymorphs,
which involve distortions or rotations of the SiO sub 4 /sub tetrahedra. Also Jahn–Teller
and ferroic transitions.
