Antiferroelectricity
– Physical property of certain materials
– Closely related to ferroelectricity
– Analogous to antiferromagnetism and ferromagnetism
– Consists of ordered array of electric dipoles
– Adjacent dipoles oriented in opposite directions
Ferroelectricity
– Dipoles all point in the same direction
– Contrasted with antiferroelectricity
– Exhibits macroscopic spontaneous polarization
– Can be influenced by temperature, pressure, and external electric field
– Can strengthen or weaken depending on parameters
Néel Point or Curie Point
– Temperature at which antiferroelectricity disappears
– Can be referred to as Néel point or Curie point
– Determines the transition from antiferroelectric to other states
– Influenced by temperature, pressure, and growth method
– Critical for understanding antiferroelectric behavior
References
– Compendium of chemical terminology – Gold Book
– Charles Kittel’s Theory of Antiferroelectric Crystals
– Phys. Rev. article on antiferroelectric crystals
– Polarization states related to antiferroelectricity
– Dielectric, paraelectricity, ferroelectricity, helielectricity, and ferrielectricity
Related Articles
– Condensed matter physics-related article stub
– Electromagnetism-related article stub
– Wikipedia can be expanded with more information
– Antiferroelectricity as a stub category
– All stub articles in the electromagnetism field Source: https://en.wikipedia.org/wiki/Antiferroelectricity
Antiferroelectricity is a physical property of certain materials. It is closely related to ferroelectricity; the relation between antiferroelectricity and ferroelectricity is analogous to the relation between antiferromagnetism and ferromagnetism.
An antiferroelectric material consists of an ordered (crystalline) array of electric dipoles (from the ions and electrons in the material), but with adjacent dipoles oriented in opposite (antiparallel) directions (the dipoles of each orientation form interpenetrating sublattices, loosely analogous to a checkerboard pattern). This can be contrasted with a ferroelectric, in which the dipoles all point in the same direction.
In an antiferroelectric, unlike a ferroelectric, the total, macroscopic spontaneous polarization is zero, since the adjacent dipoles cancel each other out.
Antiferroelectricity is a property of a material, and it can appear or disappear (more generally, strengthen or weaken) depending on temperature, pressure, external electric field, growth method, and other parameters. In particular, at a high enough temperature, antiferroelectricity disappears; this temperature is known as the Néel point or Curie point.
