Answer to Question #120623 in Inorganic Chemistry for Yuki

Question

Why is poling important for ferroelectric piezoelectrics? Explain.

Answer 1

The poling process of piezoelectric ceramics materials can be carried out to align the net polarization in a direction of applied high DC voltage. The net polarization alignment is dependent on the poling conditions of field biasing, temperature and biasing time. The poling conditions is altered from ceramics materials to others, i.e it is vary with the type of piezoelectric ceramics. To start with optimizing the poling condition it is very important to synthesis a good and dense piezoelectric ceramic, to know the phase transition, to know the coercive field and the breakdown voltage. Generally, the higher biasing field approximately 2Ec results in more complete polarization. Similarly, longer poling duration and higher poling temperature (less that Tc) derive better piezoelectric properties.