Study Of Photoluminescence And Electric Properties Of Pr³⁺ Doped PMN-PT Multifunctional Ceramics

In recent years,the research of Pb(Mg_1/3Nb_2/3)O₃-x Pb Ti O₃?PMN-x PT?ceramics has become more and more popular because the PMN-PT system exhibit giant piezoelectricity at the quasi-incophase boundary.The d₃₃can reach 2500 p C/N or more,and the dielectric constant also reaches more than 20,000.Due to its good piezoelectric ferroelectricity,d₃₃is often used as an ultrasonic transducer,piezoelectric transducer,and other materials.In recent years,a large number of researchers prefer to dope rare-earth ions in this material to make it multifunctional,that is,a multi-functional material that has both good piezoelectric ferroelectricity and fluorescence,due to the doping of many rare-earth ions.PMN-PT materials are quenched by light.However,Pr³⁺is doped with XENON light.However,dazzling fluorescence occurs.Therefore,Pr³⁺-doped PMN-PT material was chosen as the research object.The research content of this topic is mainly divided into two lines,the first line:control PT concentration,to prepare?1-x?PMN-x PT ceramics,where x is equal to0.2,0.33,0.35,0.4,study its electrical properties and select from Component with the best electrical performance;second line:PMN with x Pr³⁺doped 0.67 PMN-0.33 PT,Pr³⁺concentration 0.2 mol%,1 mol%,2 mol%,4 mol%,and Pr³⁺concentration of 0-Pure PT ceramics were selected from which the components with the best fluorescent properties were selected;finally,the most suitable components were selected in combination with their electrical properties and fluorescence properties.In this experiment,a traditional solid phase reaction method was used to synthesize ceramic Pr³⁺-doped PMN-PT ceramics.It was repeatedly prepared and optimized step-by-step to prepare dense ceramics with high grain size and passed X-ray diffractometer?XRD?.The phase characterization was performed and the surface morphology was observed by scanning electron microscopy?SEM?.The prepared ceramic was then back-silvered for the next electrical performance test.Secondly,by measuring the electrical properties of the ceramics by changing the concentration of PT,the PE curves and d₃₃were measured and analyzed,as well as the optical properties,the measured fluorescence spectra,and the electrical properties and optical properties were analyzed to find out the rules;After the PT concentration was changed,the Pr³⁺concentration was changed,the fluorescence spectrum was measured,the optimal light emission concentration was found,and the electrical properties were tested to select the most suitable concentration for the optical performance and the electrical performance.In addition,this article also tested the dielectric temperature spectrum of ceramics,observed changes in its dielectric constant with temperature as the temperature changes,and observed its Curie temperature?the transition point of the ferroelectric to paraelectric?,and in turn Understand the changing trend of the phase transition point when Pr³⁺concentration changes.The research content of this dissertation can realize the multi-functionalization of ceramics and promote the cross-research of ferroelectric Voltage materials and fluorescent materials.