BaPbO 3  (BPO)/PbZr0.53Ti0.47 (PZT)/BPO heterostructures were fabricated by combining the sol-gel and rf-magnetron sputtering techniques. Experimental results indicate that the BPO bottom electrodes effectively prevent the formation of the rosette structure of PZT, producing smooth surfaces. Additionally, ferroelectric, fatigue, and leakage current properties were markedly improved when both the top and the bottom electrodes were changed from Pt to BPO. These improvements are due to a superior electrode/ferroelectric interface. BPO is better than Pt and other oxide electrodes for use in PZT ferroelectric capacitors due to its remarkably improved properties and quite low growth temperature.

The reaction sequence of 0.15(Bao.9sSro.os)0. 0.15Sm2o3 * 0.7Ti02 ceramics during heating as well as the effects of calcination and sintering on microwave properties were investigated. Quantitative microscopic analysis was performed to obtain the volume fraction of the phases. It was found that the amount of second phase, especially T i 2 (rutile), greatly affected the temperature coefficient of resonant frequency of the ceramics. The higher the amount of Ti02 phase, the more positive or the less negative the temperature coefficient of resonant frequency. The temperature coefficient of BaO -Smt03*STiOt was calculated using the logarithmic mixing rule to be -30 ppm/OC. The volume fractions of the phases varied with conditions of calcination and sintering. Therefore, by varying calcination and/or sintering temperature, the temperature coefficient of resonant frequency could be adjusted to nearly zero. [

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Pb(Znl/~Nb,/3)03 (PZN) ceramic is used to improve the piezoelectric properties of PZT ceramics. Complete perovskite phase is synthesized for PZN content up to 10 mol%. Piezoceramics having dielectric constant higher than 3000 and planar couplin factor about 60% are the thickness of ceramic plate. Plate with thickness smaller than l o o p shows nothing in superior piezoelectric properties. The second phase ZrO2 due to the evaporation of PbO phase during sinterin is the dominant factor. gradually plays an important role when thickness is thin enough. Experimental results demonstrate both the control of PbO vapor pressure and the processing conditions can effectively reduce such deterioration.obtainable. However, these properties seem to be 9 eteriorated by decreasing This non-piezoelectric phase exists on the surface o P piezoceramic plate and