Department of Materials Science, Sichuan University, 610064, PR China.
ACS Appl Mater Interfaces. 2013 Aug 28;5(16):7718-25. doi: 10.1021/am402548x. Epub 2013 Aug 12.
High-performance lead-free piezoelectrics (d33 > 400 pC/N) based on 0.96(K0.5Na0.5)0.95Li0.05Nb1-xSbxO3-0.04BaZrO3 with the rhombohedral-tetragonal (R-T) phase boundary have been designed and prepared. The R-T phase boundary lies the composition range of 0.04 ≤ x ≤ 0.07, and the dielectric and piezoelectric properties of the ceramics with the compositions near the phase boundary are significantly enhanced. In addition, the ceramic with x = 0.07 has a giant d33 of 425 pC/N, which is comparable to that (416 pC/N) of textured KNN-based ceramics (Saito, Y.; Takao, H.; Tani, T.; Nonoyama, T.; Takatori, K.; Homma, T.; Nagaya, T.; Nakamura, M. Nature 2004, 432, 84). The underlying physical mechanisms for enhanced piezoelectric properties are addressed. We believe that the material system is the most promising lead-free piezoelectric candidates for the practical applications.
基于 0.96(K0.5Na0.5)0.95Li0.05Nb1-xSbxO3-0.04BaZrO3 的高性能无铅压电陶瓷（d33＞400 pC/N），具有菱方-四方（R-T）相变边界已被设计和制备。R-T 相变边界位于 0.04≤x≤0.07 的组成范围内，且在接近相变边界的陶瓷的介电和压电性能显著增强。此外，组成为 x=0.07 的陶瓷具有约 425 pC/N 的巨大 d33，与织构化 KNN 基陶瓷（Saito，Y.；Takao，H.；Tani，T.；Nonoyama，T.；Takatori，K.；Homma，T.；Nagaya，T.；Nakamura，M. Nature 2004，432，84）相当。探讨了增强压电性能的潜在物理机制。我们相信，该材料体系是最有前途的无铅压电候选材料，适用于实际应用。
