Ferroelectric materials are special class of materials which exhibit a spontaneous polarization, which can be reversed by applying an external electric field. The permittivity is a measure of a material's ability to store electrical energy in an electric field. In ferroelectric materials, the permittivity is directly related to the energy storage capacity.

The permittivity of ferroelectric materials is generally higher compared to normal dielectric materials. This high permittivity allows for a larger amount of electrical energy to be stored in the electric field. The energy stored in the electric field is proportional to the square of the polarization and the permittivity of the material. The relationship between the permittivity and the energy stored in a ferroelectric material can be described as:

Energy = 1/2 * Permittivity * Electric field^2

Thus, the permittivity of ferroelectric materials plays a critical role in determining the energy storage capacity of these materials. Ferroelectric materials with higher permittivity have higher energy storage capacity and are more suitable for applications such as energy storage devices, capacitors and actuators.

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