Question

What happens in Ferroelectric material when T < Tc?

(a) Non-polarized

(b) Spontaneously polarized

(c) Becomes Para-electric

(d) Hysteresis loss

The question was posed to me during a job interview.

The above asked question is from Ferroelectricity in section Dielectrics of Engineering Physics II

Answer 1

The correct option is (b) Spontaneously polarized

For explanation I would say: When the temperature is less than the transition temperature, the material becomes spontaneously polarized i.e., an electric polarization develops in it without the help of an externally applied field.