The figure below shows the schematic polarization (P) versus electric field (E) curve for a ferroelectric material.

(a) Schematically show what the polarisation (P) versus electric field (E) curve for a ferroelectric material looks like slightly above the Curie temperature for the material? Explain. 

(b) BaTiO₃, with a perovskite-type structure is ferroelectric at room temperature. Explain the structural origin for ferroelectricity in this material. 

(c) Is the room temperature structure of BaTiO₃ centrosymmetric or noncentrosymmetric? Explain. 

(d) How does the structure of BaTiO₃ change above the Curie temperature and how does that influence the ferroelectric property?

Transcribed Image Text:

+P E +P E

Answer rating: 100% (QA)

Answer a b ... View the full answer