Term: ferroelectric (antiferroelectric) transition
https://doi.org/10.1351/goldbook.F02347

Definition:
A transition from a ferroelectric to either another ferroelectric, or a paraelectric, or an antiferroelectric state. Example: The transition of the low-temperature, cubic paraelectric BaTiO3 to the high-temperature, tetragonal, ferroelectric form at 393 K.

Notes:
0) In an antiferroelectric transition individual dipoles become arranged antiparallel to adjacent dipoles with the result that the net spontaneous @P04712@ is zero.
1) Ferroelectric/antiferroelectric transitions also occur in the @LT06854@. These states are dependent on the alternating nature of dipoles between layers in the @S05714@.

Related Terms:
1) polarization (http://doi.org/10.1351/goldbook.P04712).
2) liquid-crystal state (http://doi.org/10.1351/goldbook.LT06854).
3) smectic state (http://doi.org/10.1351/goldbook.S05714).

Source: PAC, 1994, 66, 577. 'Definitions of terms relating to phase transitions of the solid state (IUPAC Recommendations 1994)' on page 582 (https://doi.org/10.1351/pac199466030577)

Citation: 'ferroelectric (antiferroelectric) transition' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.F02347

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