Explanation

ceramics with ferroelectricity. The so-called ferroelectricity means that materials have spontaneous polarization within a certain temperature range, and spontaneous polarization can be orientation with the external electric field. BaTi03, PbTiC) 3, SrTi() 3, etc. are typical ferroelectric ceramics. In addition, there are tungsten bronze type, bismuth containing layered compound, pyrochlore type and strontium niobate type ferroelectric ceramics. The high dielectric constant of ferroelectric ceramics can be used to make large capacity ceramics capacitors; Using its piezoelectricity, various piezoelectric devices can be made; Infrared detectors can be made using their pyroelectric properties. Transparent ferroelectric ceramics made by proper process have electric control optical characteristics, and can be used to make electro-optical devices for storage, display or switch. Properly doped ferroelectric semiconductive ceramics can be used for sensing elements. Using the dielectric constant of ferroelectric ceramics to be non-linear with the external electric field, dielectric amplifiers and phase shifters can be made. PZT, PLZT and other ferroelectric ceramics films prepared by physical or chemical methods have important applications in electro-optic devices, nonvolatile ferroelectric memory devices, etc.

Classification