Nowadays, perovskite materials and their unique properties are a hot topic of research. Here find some questions asked in a recently held interview for a project position:
What are the properties of ferroelectric materials?
A ferroelectric material develops strain and polarisation when it is placed in an electric field, this effect is called Ferroelectricity.
Give some examples of ferroelectric materials?
Barium Titanate (BaTiO3) and Rochelle salt
What do you mean by electro-calorific effect?
An electro-optic effect is a change in the optical properties (refractive index) of a material in response to an electric field that varies slowly compared with the frequency of light.
Explain the piezoelectric effect?
Piezoelectric Effect is the ability of certain materials to generate an electric charge in response to applied mechanical stress
What is the inverse effect of piezoelectricity?
Reversal of the piezoelectric effect called the inverse piezoelectric effect is when voltage is applied to shrink or expand a piezoelectric crystal. Using the inverse piezoelectric effect can help develop devices that generate and produce acoustic sound waves
State Bragg’s Law.
Given some figures, the candidate was asked to find the miller indices.
Explain the reason for peak broadening in the XRD spectrum?
Lattice strain and crystallite size are the two factors leading to peak broadening in the XRD spectrum. The smaller the diameter of the particles, the greater is the width of the peak. On the other hand, the larger the lattice strain, the greater is the broadening. To know more: click here