Abstract
Abstract The micro-structural, electrical and resonant properties of (Pb, La, Nd)(Ti, Mn, Sb)O3 ceramics were investigated as a function of CuO addition and internal electrode weight. The best properties for the resonator application were observed from the 0.25 wt.% CuO added specimen sintered at 1200 °C. Curie temperature and density of the specimen were measured to be 325 °C and 7.72 g/cm3, respectively. Dynamic characteristics of energy-trapped 30 MHz surface mount device (SMD) type resonators using 3rd overtone thickness vibration mode were also investigated as a function of internal electrode weight and CuO addition. Ceramic wafers for resonator were fabricated by evaporating electrode weights of 0.66, 1.765, 2.32, and 3.87×10−4 g/cm2 with silver, respectively. And then, 30 MHz SMD-type ceramic resonators were fabricated with the size of 3.7 mm ×3.1 mm and electrode diameter of 0.77 mm. With increasing electrode weight, resonant resistance was gradually decreased. At the electrode weight of 2.32×10−4 g/cm2, mechanical quality factor (Qmt3) and dynamic range (DR) for the 3rd overtone thickness vibration mode showed the maximum value of 2152 and 49 dB, respectively.
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