(Bi0.5Na0.5)ZrO3 modified KNN-based ceramics: Enhanced electrical properties and temperature insensitivity

To further improve the properties of KNN-based lead-free ceramics, a new ceramic system, (0.98-x) K0.525Na0.475Nb0.965Sb0.035O3 -0 02 BaZr0.5Hf0.5O3-x(Bi0.5Na0.5)ZrO3 (KNNS-BZH-xBNZ) was designed, the relevant properties such as piezoelectricity, strain, and temperature stability were analysed in detail. It was found that the R-T phase boundary can be successfully constructed when x=0.030, and this two-phase coexistence shows relatively good comprehensive properties (d(33)similar to 410 pC/N, T-c similar to 255 degrees C, S-uni similar to 0.132%, and d(33)*similar to 441 pm/V). Meanwhile, its strain property also shows good temperature stability from room temperature to 180 degrees C (S-uni100 degrees C/S-uniRT similar to 97.5 % and S-uni180 degrees C/S-uniRT similar to 83.9%), which is comparatively superior to many KNN-based ceramics and some lead-based ceramics. Therefore, KNNS-BZH-xBNZ ceramics may broaden the practical application of lead-free ceramics.