The present work attempted to investigate the effect of Nb addition on the electrical properties of the (Ca,Si,Ce,Nb)-doped TiO2 ceramics. The content of added niobium is in the range 0.1-1.0mol %, while that of the other additives keeps constant. The results showed that an optimal composition doped with 0.8mol% Nb2O5, followed by sintering at 1350°C, was obtained with low V1 mA of 7.22V, high
nonlinear coefficient of 5.76, ultrahigh dielectric constant (er = 86000) as well as relatively low loss (tgd = 0.52) in room temperature at 1 kHz. SEM studies show that change of niobium had significant influence on grain growth and micro structural characteristics of the sintered samples.
In this paper, piezoelectric laminated cylindrical shells with shear piezoelectric actuators are discussed. Each of the response quantities of every layer of the shell is expanded in a double Fourier series in the local surface coordinates. A state-space approach is used to generate a 8 first-order ordinary homogeneous differential equations with variable coefficients. The frobenius method is used to get the solutions. Numerical results show the effects of the thickness ratios on the response quantities for electric loadings. A comparison of stresses between shear actuators and extension actuators reveals that the longitudinal stresses within the shear actuators are significantly smaller than those in the extension actuators, which means using shear actuators is better to brittle piezoceramic materials.
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