PZT piezoelectric ceramics and piezoelectric ceramic ternary

The morphotropic phase boundary is also called allomorphism line, refers to two yuan or polynary piezoelectric materials, near this composition ratio, piezoelectric materials Kp, epsilon are a maximum value, minimum value of Qm appeared.

For PZT ceramics, morphotropic phase boundary is located near Zr:Ti=53:47. Not a very clear understanding of the composition of the morphotropic phase boundary, but with a certain width ratio of constituents within the scope of the overlapping zone.

Section in this composition ratio within each grain, ceramic body between or within the same grain, can exist at the same time the tetragonal and trigonal phase structure.

Between the two phases of the free energy difference is small, change the activation energy is low, as long as the weak external electric field induced by the change of this kind, can produce the phase structure, the spontaneous polarization axis between grains of different orientations to adjust the direction of field as much as possible.

So e maximum value, the geometric deformation, Kp also.

At this time, with the strengthening of the spontaneous polarization in ferroelectric domain oriented, fully, in the process of domain wall steering friction intensified, thus increasing dielectric loss, mechanical quality factor Qm decreased.

PZT piezoelectric ceramics and the three element system piezoelectric ceramic phase diagram of the morphotropic phase boundary, what are the characteristics, what is the difference?

Similarities: near the morphotropic phase boundary, Kp, e are a maximum value, minimum value of Qm appeared.

The difference: PZT piezoelectric ceramic in the morphotropic phase boundary near Zr:Ti=53:47, is with a certain width ratio range of the overlap region composition. Section in this composition ratio within each grain, ceramic body between or within the same grain, can exist at the same time the tetragonal and trigonal phase structure.

Article two the morphotropic phase boundary three yuan system piezoceramics. The Department has three yuan more options are available for a wide range of composition.