Composition Design Rule for High Piezoelectric Voltage Coefficient in (K0.5Na0.5)NbO3 Based Pb-Free Ceramics

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In this manuscript, the phase transition factor (F_{\text{t}}) was suggested as a design rule for high piezoelectric voltage coefficient in (K0.5Na0.5)NbO3 (KNN) based ceramics. The F_{\text{t}} consisted of the tolerance factor and electronegativity difference. High piezoelectric voltage coefficient was observed when the doping ratio for the starting point of phase transition (x^{*}) was higher than 0.04 in KNN based ceramics. At the range of F_{\text{t}} < -0.01, x^{*} was higher than 0.04 and high g_{33} value ({>}30 mV\cdotm/N) was observed in KNN based ceramics.
2012-09-25