ferroelectric crystal การใช้

• Ferroelectric crystals often show several transition temperatures and ferromagnetic crystals.
• The nature of the phase transition in some ferroelectric crystals is still not well understood.
• This is analogous to ferromagnetism, in that, in the absence of an electric field during production, the ferroelectric crystal does not exhibit a polarization.
• As another example, in a ferroelectric crystal, there is typically a centrosymmetric configuration above the Curie temperature, and "'P "'is defined there by convention to be zero.
• Since gradual changes in "'P "'are uniquely defined, this convention gives a unique value of "'P "'for the ferroelectric crystal, even below its Curie temperature.