Abstract
0.03Pb<TEX>$(Sb_{0.5}Nb_{0.5})O_{3}-0.03Pb(Mn{1/3}Nb{2/3)O_{3}-(0.94-x)PbTiO_{3}-xPbZrO_{3}$</TEX> ceramics doped with <TEX>$CeO_{2}$</TEX> were synthesized by conventional bulk ceramic processing technique. Phases analysis, microstructures and piezoelectric properties were investigated as a function of <TEX>$CeO_{2}$</TEX> content (0.03, 0.05, 0.1 0.3, 0.5 and 0.7 wt%). Microstructures and phases information were characterized using a scanning electron microscope (SEM) and an X-ray diffractometer (XRD). Mechanical quality factor (<TEX>$Q_{m}$</TEX>) and coupling factor(kp) were obtained from the resonance measurement method. Both <TEX>$Q_{m}$</TEX> and <TEX>$k_{p}$</TEX> were shown to reach to the maximum at 0.1 wt% <TEX>$CeO_{2}$</TEX>. In order to evaluate the stability of resonance frequency and effective electromechanical coupling factor (<TEX>$K_{eff}$</TEX>) as a function of <TEX>$CeO_{2}$</TEX>, the variation of resonance and anti-resonance frequency were also measured using a high voltage frequency response analyzer under various alternating electric fields from 10 V/mm to 80 V/mm. It was shown that the stability of resonance frequency and effective electromechanical coupling factor were increased with increasing the <TEX>$CeO_{2}$</TEX> contents.
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