piezoelectric effect and dielectric effect of piezoelectric ceramic

Any medium in the electric field will cause deformation of the medium due to the effect of induced polarization, and this deformation is different from the deformation caused by the inverse piezoelectric effect. The dielectric may be elastically deformed by an external force, piezoelectric ceramic knock sensor may be deformed by the polarization of the external electric field.The deformation due to the induced polarization is proportional to the square of the external electric field, which is an electrostrictive effect. The deformation it produces is independent of the direction of the external electric field. The deformation caused by the inverse piezoelectric effect is proportional to the external electric field, and when the electric field is reversed, the deformation also changes (for example, the original elongation can be shortened, or the original shortening can be changed to elongation). In addition, the electrostrictive effect is present in the all dielectrics, whether non-piezoelectric or piezoelectric has only the electrostrictive effects of dielectric crystals of different structures . The inverse piezoelectric effect is only found in piezoelectric ceramics crystals.

A PZT materials piezo ceramic crystal that produces a piezoelectric effect is called a piezoelectric crystal. One type of piezoelectric crystal is a single crystal such as quartz (SiO2), sodium potassium tartrate (also known as Loser salt, NaKC4H4O6.H2O), bismuth ruthenate (Bi12GeO20). Another type of piezoelectric crystal is called on piezoelectric ceramics, such as barium titanate (BaTiO3), lead zirconate titanate Pb(ZrxTirx)O3, lead bismuth magnesium zirconate titanate made in Japan, added to PZT, bismuth manganese made in China. Lead zirconate titanate Pb(Mn1/2Sb2/3)O3 was added to PIT.

Dielectric is an insulator that can be electrodeized. The use of dielectrics is quite extensive. The dielectric conductivity of piezoelectric ceramic element is very low, coupled with the good dielectric strength properties, which can be used to make electrical insulators. In addition, the dielectric can be highly electrodeposited and is an excellent capacitor material. The study of dielectric properties involves the storage and dissipation of electrical and magnetic energy within the material. This study is extremely important for explaining the various phenomena of electronics, optics and solid state physics. Dielectric properties refer to the properties of storage and loss of electrostatic energy under the action of an electric field, usually expressed by dielectric constant and dielectric loss. When high-frequency technology is applied to materials, such as solid wood composite flooring, dielectric properties are very important when high-frequency hot pressing is used. When the medium is applied with an electric field, an induced charge is generated to weaken the electric field. The ratio of the original applied electric field (in vacuum) to the electric field in the final medium is the permittivity, also known as the induced current rate.