Question

Which of the following is not a ferroelectric compound?

Options

• Rochelle salt

• K₄[Fe(CN)₆]

• BaTiO₂

• KH₂PO₄

Answer 1

K₄[Fe(CN)₆]

Explanation:

Ferroelectricity is a material's spontaneous electric polarisation that can be reversed by applying an external electric field. The term is used to describe a material that has a permanent magnetic moment, similar to ferromagnetism. Ferromagnetism was already known when Valasek discovered ferroelectricity in Rochelle salt in 1920. Despite the fact that most ferroelectric materials do not contain iron in their lattice, the prefix ferro, which means iron, was used to describe the property.

Barium titanate (BaTiO₃) and Rochelle salt are two examples.