Question

The dielectric material that shows spontaneous and reversible dielectric polarisation are ___________

(a) Piezoelectrics

(b) Pyroelectrics

(c) Ferroelectrics

(d) None of the mentioned

This question was posed to me in an online quiz.

My question is from Functional Materials in chapter Materials and their Properties of Engineering Chemistry I

Answer 1

Right choice is (c) Ferroelectrics

To explain I would say: Piezoelctrics are those dielectric materials in which pressure can produce an electrical response and electrical forces produce a mechanical response. Pyroelectrics are those dielectric in which polarisation changes with temperature. Ferroelectrics are those dielectric materials that show spontaneous and reversible dielectric polarisation.