Temperature dependence of elastic and piezoelectric properties of lead-free (Li,Na,K)NbO3 ceramics

Temperature dependence of both elastic and electric properties for tetragonal (Li0.06Na0.47K0.47)NbO3 (LNKN-6) ceramics was investigated. The sample was prepared using a conventional solid-state reaction method. The elastic and piezoelectric properties were characterized using the resonance method as a function of temperature ranging from −50 to 50 °C. Elastic compliance S31E and S33E showed the maximum values at specific temperatures of 0 and −5 °C, respectively, while dielectric constant ε11T and ε33T showed anomalies at 20 and 7 °C, respectively. Such anisotropic properties were also observed in the measurement of the temperature dependence of the piezoelectric properties. Anisotropic temperature dependence of both the elastic and electric properties in LNKN-6 ceramics was evaluated.