Preparation,Electrical And Luminescent Properties Of Pr³⁺ Doped PIMNT Piezoceramic

The research and development of new materials is a very important aspect in the national development strategy.The piezoelectric ceramic Pb?In1/2Nb1/2?O3-Pb?Mg1/3Nb2/3?O3-PbTiO3?PIMNT?has very good ferroelectric,piezoelectric,dielectric and electromechanical properties.This makes PIMNT gradually become a very important piezoelectric material.In recent years,Pr³⁺doped multifunctional materials have attracted wide attention.Some oxides doped with Pr³⁺have been proved to have high luminous efficiency.At the same time,for the specific type of substrate,the luminescence intensity of Pr³⁺is found to be strongly dependent on the doping concentration and lattice field,and thus has a wide application in the field of sensor.The study on the electrical properties and luminescence properties of Pr³⁺doped PIMNT can not only further improve the understanding of the luminescence mechanism of Pr³⁺,but also have a profound influence on the development and application of rare earth doped multi-functional materials.In this thesis,Pr³⁺doped PIMNT?24/42/34?piezoelectric ceramics were prepared.Subsequently,the electrical properties and photoluminescence properties of PIMNT?24/42/34?piezoelectric ceramics were studied.The main contents are as follows:?1?the PIMNT?24/42/34?piezoelectric ceramics with different concentrations of Pr³⁺doped were prepared by two step solid-state reaction.The EDS spectra showed that Pr³⁺had successfully entered the PIMNT?24/42/34?lattice.The results of XRD and SEM tests showed that the crystallinity of the prepared Pr³⁺doped PIMNT?24/42/34?ceramics was good.?2?The ferroelectric,dielectric,piezoelectric and electromechanical properties of PIMNT?24/42/34?piezoelectric ceramics after doping Pr³⁺with different proportions were systematically investigated.It is found that after the doping of Pr³⁺,the ferroelectric,dielectric,piezoelectric and mechanical properties of the PIMNT?24/42/34?piezoelectric ceramics all decrease with the increase of Pr³⁺doping.However,when the amount of doping reaches 1.0 mol%,the coercive field Ec is 7.78kV/cm,the remanent polarization Pr can reach 14.11?C/cm²,and the piezoelectric strain coefficient d33 can reach 303 pC/N.The electromechanical coupling coefficient kp can also reach 32%,and the mechanical quality factor Qm is as high as 68.9.These performances are sufficient to meet the practical application of Pr³⁺doped PIMNT?24/42/34?piezoelectric ceramics.?3?The photoluminescence properties of PIMNT?24/42/34?piezoelectric ceramics were investigated after doping Pr³⁺.The effects of different factors such as excitation wavelength,doping concentration,ambient temperature and polarization on the photoluminescence properties of Pr³⁺doped PIMNT?24/42/34?were investigated.By using the relationship between ¹D2-³H4 and³P0-³H4 fluorescence intensity ratio and temperature,ultrahigh sensitivity temperature sensing is realized,and its temperature sensing sensitivity is as high as 9987.1/T².At the same time,the applied electric field of 0-25.0kV/cm is applied to ceramics,and polarization is found to only affect the luminous intensity of ceramic samples.Subsequently,the effect of Annealing on the photoluminescence of Pr³⁺doped PIMNT?24/42/34?piezoelectric ceramics was studied,and it was found that it had good stability in oxygen atmosphere.In this paper,the electrical and photoluminescence properties of Pr³⁺doped PIMNT?24/42/34?have been studied in depth,which lays a solid foundation for the application of Pr³⁺doped piezoelectric ceramics in multi-functional devices.