Microstructure and Electrical Properties of (K, Na, Li) NbO_3-Pb(Zr,Ti)O_3 Piezoelectric Ceramics

摘要

A new type (1-x)(K_(0.485)Na_(0.485)Li_(0.03))NbO_3-xPb(Zr_(0.53)Ti_(0.47)) O_3 piezoelectric ceramics was fabricated by conventional ceramics sintering technique. Their microstructure and electrical properties of the ceramics were also studied. X-ray diffraction and scanning electron microscopy patterns indicate that all ceramics samples exhibit a pure perovskite and highly dense structure, and the coexistence of the tetragonal and orthorhombic phases is formed; The ceramic with x = 0.75 exhibits the following excellent properties: d_(33) = 363 pC/N, k_p = 63%, Q_m = 142, ε_r=1590, tan 5=1.70%, P_r = 28.6 μC/cm~2, E_c = 0.89 kV/mm, T_c = 295℃. These results indicate that the ceramic is a promising candidate for piezoelectric ceramics in practical applications.