G33 Value Research Articles

Effect of Porous Structure to Piezoelectric Properties of PZT Ceramics

Porous Pb(Zr0.53 Ti0.47)O3 ceramics with three dimensionally interconnected structure were prepared by modifications of conventional powder sintering methods. The piezoelectric and elastic properties of the porous PZT were investigated by related with pore structures such as porosity and pore size. As porosity increased, permittivity decreased linearly and piezoelectric coefficient d33 increased gradually, so the voltage output coefficient g33 increased. The g33 value was 200–300×10-3 (Vm/N) at the porosity of 0.65.

Comparison of cube-textured and conventional nickel magnetostrictive ring transducers during low-power linear drive

The magnetic and magnetostrictive properties of a scroll-wound ring transducer made from cube-on-face-textured nickel were measured and compared to the corresponding properties of a conventional Nickel 200 ring transducer. Both transducers were separately excited in air at low-power linear drive levels with varying levels of bias induction, and their electrical input impedances were measured. Some in-water measurements were also made on the two rings at nearly optimum values of bias induction. Nickel 200 exhibits larger μT33 and d33 values at all induction levels, while the textured nickel shows larger k33 and g33 values. The data obtained can be used to choose the type of ring and bias induction level of operation which will best satisfy a given requirement. Subject Classification: 85.46.