抄録
The transparent piezoelectric ceramics were prepared by hot-pressing the Pb(Zr.Ti)O3 containing small at% of various oxides. As additives, La2O3 and Bi2O3 increased the transmittance, La2O3 and Sb2O3 decreased the coercive field and gave a hysteresis loop with fairly square form, and Sb2O3 and WO3 improved the piezoelectric properties.
The average grain diameter of a composition of s(Pb0.92La0.08) (Zr0.65Ti0.35)O3 was controlled by the hot-pressing conditions such as hot-pressing temperature, pressure, time, and annealing temperature and time. For these specimens, the electrical and optical properties were examined as a function of the average grain diameter. In conclusion, the electrical constants such as dielectric constant, coercive field, remanent polarization were changed linearly against logarithm plot of the grain diameter. On the other hand, the optical constants such as transmittance, reflectivity showed a maximum or minimum at a grain size range of 2.5-3.0μm. The reason why the transparency is decreased at larger grain size region seems to be caused by the enhancement of the impurity concentration on the grain boundaries accompanying the grain growth.
