PIEZOELECTRIC PROPERTIES OF ((Na_0.5K_0.5)_1−xLi_x)(Nb_0.8Ta_0.2)O₃ CERAMICS

ABSTRACT

In the ((Na_0.5K_0.5)_1−x)Li_x)(Nb_0.8Ta_0.2)O₃ (NKLNT) system, dense ceramics were developed by conventional sintering process. The electrical properties of NKLNT ceramics were investigated as a function of Li substitution. When the sample sintered at 1100°C for 4 h with the substitution of 2 mol% Li at the morphotropic phase boundary, electro-mechanical coupling factor (k_P) and piezoelectric coefficient (d₃₃) were found to reach the highest values of 0.42 and 210 pC/N, respectively. These excellent piezoelectric and electromechanical properties indicate that this system is potentially good candidate for lead-free material for a wide range of electro-mechanical transducer applications.

keywords:

• Piezoelectric
• lead-free
• sodium potassium niobate