Piezoelectric properties of Li₂O excess (Na_0.4875K_0.4625Li_0.05)(Nb_0.95Ta_0.5)O₃ ceramics by conventional sintering method

抄録

Lead-free piezoelectric ceramics, (Na_0.4875K_0.4625Li_0.05)(Nb_0.95Ta_0.05)O₃ systems, were developed using the conventional sintering process. The grain growth behavior and piezoelectric properties of the ceramics were investigated. Their sintering temperature was lowered by adding 1 mol% of Li₂O as a sintering aid. When the sample was sintered at 1050°C for 4 h with a composition of 1 mol% of excess Li₂O (Na_0.4875K_0.4625Li_0.05)(Nb_0.95Ta_0.05)O₃, the electro-mechanical coupling factor (k_P) and the piezoelectric coefficient (d₃₃) were found to reach the highest values of 0.42 and 244 pC/N, respectively.