piezoelectric transducer for ferroelectricity piezo ceramics

                            piezoelectric transducer for ferroelectricity piezo ceramics 

Ferroelectricity piezo ceramics is the region of which the dipoles in the ferroelectrics.Piezo expansion sensorare ordered for the direction of spontaneous polarization is consistent. Having an electric crucible structure is an important feature of ferroelectrics. Because the piezoelectric transducer pressure sensor itself does not have a piezoelectric signal, after the polarization treatment, the disorganized domains become orderly, and then the required polarization piezoelectric of piezo discs wire leadare obtained. The type, size, and motion of the power switch have important effects on the ferroelectric and piezoelectric properties of the ferroelectric material, and the different polarizations of the crystal structure are different. 

The earliest 1Mhz piezo disc piezoelectric ceramics were perovskite-type barium titanate. The transition temperature (Curie point) of the ferroelectric phase and the paraelectric phase was 120 °C. The unit cell of mechancial transducer piezo disc was cubic, when the temperature is dropped to curie. Below the point, they become tetragonal, orthorhombic and trigonal, in order that the c-axis of piezoelectric transducer manufactuersbecomes longer or shorter, titanium ions are squeezed out of the plane where the oxygen ions are located, and titanium ions deviate from the center of the oxygen polyhedron. The positive and negative charge centers of piezo ceramic cylinder do not coincide in the c-axis direction. cell polarization occurs.

 This is the spontaneous polarization. Since the polarization directions of the parts are different, a small area where the direction of spontaneous polarization is uniform is formed. By means of light, electricity, sound and other means, a variety of methods have been developed for observing electric power, which is mainly including surface modification methods, optical methods, scanning microscopy, and scanning probe microscopy. At present, there are mainly two kinds of performance improvement of ultrasonic atomizing piezoelectric: one is doping modification; the other is new preparation process.Among them, the most is studied by researchers is doping modification. 

Although the development of lead-containing piezoelectric ceramics has become more and more mature, as Pb is toxic and the human body is harmful to the environment, the search for lead-free piezoelectric ceramics has also become a trend for the future development of piezoelectric ceramics.