Effect Of Properties Of PZT By Doping MN, SR And BA Ions

This topic took the PZT material as the object of study,the traditional solid phase ceramics preparation technology as the foundation to synthesize lead zirconate titanate power of major crystalline phase of perovskite whose Zr/Ti proportion is 52/48. Sr²⁺,Ba²⁺ and Mn ions were doped to PZT under different sintering temperature and the effect of that substitution on properties of materials was studied by orthogonal-design experiment. X-ray diffraction (XRD) were applied to analyze crystalline phases of the material after synthesized. Energy dispersive X-ray(EDS) were employed for analyzing elements in the transversal section of samples. The scanning electronic microscope(SEM) were used to observe microstructure of cross section and surface of specimens.Shrinking rate and volume density increases along with enhancement of sintering temperature properly.The result of orthogonal test indicated that the optimum piezoelectric constant's condition is that the dopant content of Mn,Sr,Ba is 1.5mol%,2.0mol% and 1.0mol% respectively,sintering temperature is 1260℃;the piezoelectric constant of sample is 301pC?N-1.d33 is affected by sintering temperature most evidently; it increases along with the enhancement of sintering temperature. the optimum relative dielectric constant's condition is that the dopant content of Mn,Sr,Ba is 1.5mol%,1.0mol% and 1.0mol% separately,sintering temperature is 1220℃;the relative dielectric constant of sample is 2311. the dopant content of Mn is crucial toεT33; it increases along with the improvement of Mn when the the content of Mn is less than 1.5mol%.The distribution of particles size of two specimens after orthogonal experiment optimizing is uniform whose interior structure is continuous and compact. The average grain size of the optimum d33's sample is 15μm, while that of the optimumεT33's sample is 18μm. Piezoelectric and dielectric properties of theirs are excellent whose aging properties are nicer.