We have investigated the effects of electrical conductivity of the constituents on the dielectric and piezoelectric properties of ferroelectric 0-3 composites. The time-dependent internal electric fields are first derived, which can be induced by an applied ac field in dielectric measurement or stress in piezoelectric measurement. Our previously developed model fC. K. Wong, Y. M. Poon, and F. G...

Lead-free 0.98(Na0.5K0.5)NbO3-0.02Ba(Zr0.52Ti0.48)O3 [0.98NKN-0.02BZT] ceramics were fabricated by the conventional mixed oxide method with sintering temperature at 1,080°C to 1,120°C. The results indicate that the sintering temperature obviously influences the structural and electrical properties of the sample. For the 0.98NKN-0.02BZT ceramics sintered at 1,080°C to 1,120°C, the bulk density i...

This paper presents a micro-fabricated flexible and curled PZT [Pb(Zr0.52Ti0.48)O3] cantilever using d33 piezoelectric mode for vibration based energy harvesting applications. The proposed cantilever based energy harvester consists of polyimide, PZT thin film, and inter-digitated IrOx electrodes. The flexible cantilever was formed using bulk-micromachining on a silicon wafer to integrate it wit...

Neoplastic transformation is accompanied by losses of macromolecules typical for the fully differentiated adult cells, as well as by gains of tumor-specific or tumor-associated components, often related to components present in less differentiated fetal cells. The aim of this study was to investigate possible differences in the pattern of enzyme-active antigens included in the membranes of two ...

The effective nonlinearity ENL of periodically poled KTiOPO4 crystal is precisely measured with SHG experiment at various focusing conditions. The result shows the optimum focusing condition which maximizes the ENL at focusing parameter ξ at around 2.8 and is consistent with Boyd and Kleinman theory. The analysis based on the theory shows the nonlinear optical coefficient d33 of 17.5 [pm/V].

⎯ This paper compares two thick-film actuation technologies and assesses their suitability for use within micromachined devices. The materials are a piezoelectric composition, which exhibits a d33 coefficient of the order of 130pC/N, and a magnetostrictive material which possess a magnetostriction of 4.4ppm at a magnetic field of 11.5kA/m. Examples of their application in micromachined devices ...

Giant electric-field-induced strain of 0.70%, corresponding to a d33 * value of 1400 pm V(-1) , is observed in a lead-free (Bi1/2 Na1/2 )TiO3 -based polycrystalline ceramic. This is comparable to the properties of single crystals. An in situ transmission electron microscopy study indicates that the excellent performance originates from phase transitions under the applied electric fields.

xPb(Sc1/2Nb1/2)O3–(1 − x)Pb(Hf1−yTiy)O3 piezoelectric ceramics were prepared by solid-state route, and the phase structures properties of systematically investigated. Results showed that sample with composition x = 0.07 y 0.53 possessed higher coexistence between rhombohedral tetragonal, exhibited optimal among different constituent systems, i.e., TC 355 °C, d33 400 pC/N, εr 1390, tan δ 1.05%. ...