Study On PZT Based Multi-component Piezoelectric Ceramics With High Quality And Low Loss

As an important information function material in twenty-first Century piezoelectric ceramics have been widely applied in various fields of human production and life.With the continuous development of society,the demand for piezoelectric ceramic materials is also increasing.It is imperative to develop piezoelectric ceramics with high performance.As the representative of PNN-PZT based piezoelectric ceramics,because of its high piezoelectric properties,it has received extensive attention.In this paper,the traditional solid phase sintering method will be used to modify the PNN-PZT based piezoelectric ceramics by adding new components and ion doping in two ways.The specific content is as follows:Firstly,the PMS-PNN-PZT quaternary piezoelectric ceramics is selected as the research object,and the optimum properties is found by optimizing the ratio between PMS and PNN-PZT.The study shows that the PMS-PNN-PZT system has a very obvious dielectric relaxation behavior and PMS ceramics can obviously reduce the dielectric loss value of the system.When the content of PMS is 1 mol%,the piezoelectric properties of ceramics exhibits the optimum properties:d₃₃=725 pC/N,k_p=0.57,?_r=5930,tan?=0.654%,?=1.9937,T_c=130?.Then based on this formula,the piezoelectric ceramic system is modified by ion doping.The effects of equivalent ion oxide SrCO₃ on the phase structure,microstructure,piezoelectric properties and dielectric properties of PMS-PNN-PZT based piezoceramics were investigated.The study shows that the addition of Sr²⁺ion can improve the sintering performance.Proper doping can promote grain growth and improve the piezoelectric properties.When the content of SrCO₃ is 1 mol%,the samples have the optimum properties:d₃₃=818 pC/N,k_p=0.61,?_r=6998,tan?=0.905%,?=1.9076,T_c=115?.Based on this,when adding La₂O₃,it can be found through comparison that the incorporation of La³⁺ion significantly reduces the piezoelectric performance of the system.The effects of low-valence ion oxide Co₂O₃ on the phase structure,microstructure,piezoelectric properties and dielectric properties of PMS-PNN-PZT based piezoelectric ceramics were investigated.The results show that all the samples show a single perovskite structure.When the Co₂O₃ doping content is 0.4 wt.%,the samples have the optimum properties:d₃₃=768 pC/N,k_p=0.63,?_r=6011,tan?=0.8%,?=1.9399,T_c=131?.The effects of high-value ion oxide Ta₂O₅ on the phase structure,microstructure,piezoelectric properties and dielectric properties of PMS-PNN-PZT piezoelectric ceramics were studied.The study shows that proper doping is beneficial to the growth of grain and the compactness of the ceramics.When the doping content of Ta₂O₅ is 0.4wt.%,the samples show the optimum piezoelectric properties.Through the ferroelectric properties analysis,the remanent polarization of the sample reaches the maximum,the coercive field is small,and the ferroelectric performance is the best.In summary,the optimum properties are:d₃₃=805 pC/N,k_p=0.66,?_r=6838,tan?=1.4%,?=1.9618,T_c=118.5?,P_r=21.91?C/cm²,E_c=3.652 kV/cm.