Phase structure, electrical properties, and component stability in (1-x)K_(0.40)Na_(0.60)Nb_(0.96)Sb_(0.04)O_3-x(Bi_(0.92)Nd_(0.08))_(0.5)Na_(0.5)ZrO_3 lead-free ceramics

摘要

(1 - x)K0.40Na0.60Nb0.96Sb0.04O3-x(Bi0.92Nd0.08)(0.5)Na0.5ZrO3 (KNNS-xBNNZ) lead-free piezoceramics have been synthesized by a conventional solid state sintering method, and the effects of BNNZ content on their phase structure and electrical properties were investigated. The phase boundary of rhombohedral-orthorhombic-tetragonal (R-O-T) has been formed in the composition range of 0.030 <= x <= 0.040. An optimal comprehensive performance (e.g., d (33) 470 +/- 10 pC/N, k (p) 0.50 +/- 0.02, T (C) 283 A degrees C, epsilon (r) 1950, tan delta 0.043, Strain 0.135%, and d (33)* 450 pm/V) is obtained in the ceramics with x = 0.035. Moreover, a relatively good component stability of piezoelectric properties (d (33) 402-470 pC/N, k (p) 0.485-0.524, Strain 0.133-0.135%, and d (33)* 443-450 pm/V) is gained in a broad component range from 0.030 to 0.045, which is benefited from the contribution of multiphase boundary (R-O-T, R-T). Therefore, we believe that KNNS-xBNNZ ceramics opens a window for the practical applications in piezoelectric material markets.