ქიმიის ტერმინთა განმარტებითი ლექსიკონი

A reversible transition  of a solid crystalline phase at a certain temperature and pressure (the inversion point) to another phase of the same chemical composition with a different crystal structure. Examples:

1. The transitions of SiO₂(quartz-type) at 1143  K to SiO₂ (tridymite-type), and at 1743 K to SiO₂ (cristobalite-type).
2. The transition of β-AgI (wurtzite-type structure) to α-AgI (body-centred-cubic structure) at 418 K.

Synonymous with enantiotropic transition

Note:
In a liquid-crystal transition, this term refers to phase changes in the smectic state  or columnar discotic state.