Y³⁺取代对La₂Ti₂O₇压电陶瓷性能的影响

The perovskite-like Y_xLa_2-xTi₂O₇ ceramics with different substitution amounts were prepared by the traditional solid-state reaction method. The effects of A-site Y³⁺ substitution on the phase structure and properties of La₂Ti₂O₇ piezoeledctric ceramics were investigated. The results showed that the maximum amount of Y³⁺ in the solid solution was x=0.20 and the prepared ceramics under the solid solution limit were single four-layer perovskite-like pure phase. The substitution of Y³⁺ at the A-site increased the dielectric constant and reduced the dielectric loss, and the frequency stability of the dielectric constant with frequency changes was better after substitution. The addition of Y³⁺ makes the resonant frequency and qulity factor increase and the dielectric loss reduce. In other words, the microwave performance of the ceramics was improved, and among the prepared ceramics, the microwave properties of Y_0.10La_1.90Ti₂O₇ ceramic was the best.