Electrical Engineering ⇒ Topic : Ferroelectric material
A ferroeleetriC material contains small regions which are polarised in different directions even in the absence of an electric field.
The temperature at which the permittivity has a sharply defined peak is called the cure point.
The spontaneous polarisation vanishes at curie temperature of the material.
The Curie temperature arises in a material of higher, simply as a result of contraction of the material on cooling.
Capacitors with very high dielectric constants have been developed by treating BaTiO3 in a reducing atmosphere.
The materials having permanent electric moment are called 'electrets'
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