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Electromechanical properties of 2-2 cement based piezoelectric composite
Xu Dongyu,Cheng Xin,Huang Shifeng,Jiang Minhua 한국물리학회 2009 Current Applied Physics Vol.9 No.4
A 2-2 type cement based piezoelectric composites were fabricated by dice-and-fill technique. The influences of lead magnesium niobate-lead zirconate-lead titanate (PMN) ceramic volume fraction on the electromechanical properties of the composite were investigated. The results indicate that the planar electromechanical coupling factor Kp of the composite is hardly influenced by the PMN volume fraction, which fluctuates between 35% and 37%, while both the thickness electromechanical coupling factor Kt and the mechanical quality factor Qm exhibit the trend of increase. When PMN volume fraction is 69.2%, Kt could reach to 49.8%, which is larger than that of the PMN ceramic (Kt = 46%).When PMN volume fraction is 41.7%, Qm is 4.5, which is also much less than that of the PMN ceramic (Qm = 70). This means that the composite has wider frequency band and higher sensitivity to be used as transducers. With the increase of PMN volume fraction, the acoustic impedance of the composite also exhibits the trend of increase. A 2-2 type cement based piezoelectric composites were fabricated by dice-and-fill technique. The influences of lead magnesium niobate-lead zirconate-lead titanate (PMN) ceramic volume fraction on the electromechanical properties of the composite were investigated. The results indicate that the planar electromechanical coupling factor Kp of the composite is hardly influenced by the PMN volume fraction, which fluctuates between 35% and 37%, while both the thickness electromechanical coupling factor Kt and the mechanical quality factor Qm exhibit the trend of increase. When PMN volume fraction is 69.2%, Kt could reach to 49.8%, which is larger than that of the PMN ceramic (Kt = 46%).When PMN volume fraction is 41.7%, Qm is 4.5, which is also much less than that of the PMN ceramic (Qm = 70). This means that the composite has wider frequency band and higher sensitivity to be used as transducers. With the increase of PMN volume fraction, the acoustic impedance of the composite also exhibits the trend of increase.
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Xing Liu,Jifan Hu,Bin Cheng,Hongwei Qin,Minhua Jiang 한국물리학회 2009 Current Applied Physics Vol.9 No.3
Nanoparticulate perovskite-type LnFe0.9Mg0.1O3 (Ln = Nd, Sm, Gd and Dy) oxides were prepared by sol–gel method. X-ray diffraction was used to confirm the phase composition of the compounds. The materials exhibit p-type semiconductor behavior. Their sensitivity and selectivity towards ethanol gas were investigated. It was found that SmFe0.9Mg0.1O3-based sensor had the highest response and selectivity. It is a new potential gas sensing material. The great difference of conductance in air and ethanol gas was found and discussed in detail. Nanoparticulate perovskite-type LnFe0.9Mg0.1O3 (Ln = Nd, Sm, Gd and Dy) oxides were prepared by sol–gel method. X-ray diffraction was used to confirm the phase composition of the compounds. The materials exhibit p-type semiconductor behavior. Their sensitivity and selectivity towards ethanol gas were investigated. It was found that SmFe0.9Mg0.1O3-based sensor had the highest response and selectivity. It is a new potential gas sensing material. The great difference of conductance in air and ethanol gas was found and discussed in detail.
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