the grains of piezoelectric ceramics

With the increasing of Mn doping, the grains of piezoelectric ceramics increase first and then decrease, the grain distribution uniformity and grain strength of piezoelectric ceramic transducersare getting worse. Except Mn,it is dominated by the main doping, so that the room temperature dielectric constant and dielectric loss are reduced. Piezoelectric sensor crystalof Mn is dominated by the main doping, so that the room temperature dielectric constant and dielectric loss are reduced.Since the internal bias field is generated by Mn doping stabilizes the spontaneous polarization (domain), the Curie temperature of piezo discs for milk analysis  increases with the increasing of Mn doping amount. Since piezo ceramics block has a certain value in the piezoelectric ceramic solubility, leaving the curie temperature tends to saturation. With the increasing of Mn doping, the electricity of mechanical coupling coefficient and the piezoelectric constant decrease, while the mechanical quality factor increases first and then decreases, piezoelectric rings sensor is mainly related to the acceptor doping characteristics and grain size caused by Mn addition. Mn doping amount of 0.2% of buy piezoelectric components has good piezoelectric properties: X = 1 200, tan W = 0. 004, TC = 349 ° C, kp = 0. 60, d33 = 380 pC / N With Qm = 1 000, it can meet the requirements of piezo ceramics for piezoelectric motors under most conditions.