Lead-free (Na 0.5K 0.5)NbO 3 (NKN) ceramics doped with 1 mol% CuNb 2O 6 (CN) ceramics were prepared using the conventional mixed oxide method, with a sintering temperature of 1075 °C. Microstructural analyses of the NKN-01CN ceramics were carried out and compared, using X-ray diffraction (XRD). NKN-01CN ceramics sintered at 1075°C not only exhibited excellent 'hard' piezoelectric properties of k p = 40%, k t = 45%, k 33 = 57%, a ferroelectric property of E c = 23 kV/cm, and an extraordinarily high mechanical quality factor (Q m) of 1933 but also showed excellent stability with temperature (TCF = -154 ppm/°C). The piezoelectric transformer was simplified, using an equivalent circuit, and analyzed, using MATLAB; the simulation data agreed well with the experimental results. An efficiency of 95.7% was achieved for the NKN-01CN piezoelectric transformer with load resistance of 20 kΩ. An 8 W T5 fluorescent lamp was successfully driven by the NKN-01CN piezoelectric transformer.
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