Which of the following is a Ferroelectric compound?

The correct option is C

${\mathrm{BaTiO}}_3$

Explanation for the correct option

(C)${\mathrm{BaTiO}}_3$

Ferroelectric substances:

• Ferroelectric substances are those that can show spontaneous electric polarization which can be reversed by applying an electric field in the opposite direction.
• All ferroelectrics are pyroelectric and they exhibit the property that natural electrical polarization is reversible.
• Barium titanate (${\mathrm{BaTiO}}_3$) is an example of a Ferroelectric substance.
• Barium titanate is a ferroelectric ceramic material, with a photorefractive effect as well as piezoelectric properties.
• It is, therefore, used in capacitors/transducers.

Explanation for the incorrect options:

A) Lead oxide (${\mathrm{Pb}}_2{\mathrm{O}}_3$) is not a Ferroelectric substance.

B) ${\mathrm{K}}_4\left[\mathrm{Fe}{\left(\mathrm{Cn}\right)}_6\right]$ is not a Ferroelectric substance.

Hence, the correct option is (C) i.e. Ferroelectric compound is ${\mathrm{BaTiO}}_3$