Morphotropic phase boundary
A critical transition region in ferroelectric materials
From Wikipedia, the free encyclopedia
Morphotropic phase boundary (MPB) is a critical transition region in the composition phase diagram of a piezoelectric or ferroelectric material, where the crystal structure of the material changes abruptly and the electromechanical properties are maximal.[1][2][3] It is an extremely important parameter to be known in design of specific simple structure nonlinear materials with highly nonlinear dielectric and piezoelectric properties.[4] In ferroelectric polymers, it is used to enable a large piezoelectric effect.[5] It is also found in thermoelectric materials.[6]
In piezoelectric polymers, the morphotropic phase boundary refers to the phase transition between tetragonal and rhombohedral ferroelectric phases following a change in composition or mechanical pressure.
Induction
In materials science, particularly within the field of ferroelectrics and piezoelectrics, the morphotropic phase boundary (MPB) is the important spot of composition. It plays a critical role in applications for enhancing dielectric, piezoelectric, and optical properties in the materials. It is very useful in achieving high piezoelectric performance of piezoelectric materials. But in some piezoelectric materials like polarized organic piezoelectric materials, it is either not found or rarely found. In these materials, MPB is induced by using some mechanism, to achieve high performance of piezoelectric effects.[7][5]
