PEROVSKITE SOLID SOLUTION COMPOSITION AND PIEZOELECTRIC CERAMICS PRODUCED THEREFROM

摘要

A perovskite solid solution which comprises potassium sodium niobate (K1-xNax)NbO3 and one of a perovskite type oxide M1M2O3 and a simple oxide M32O3, wherein M1 represents a metal ion, such as Mg, Ca, Sr, Ba, Bi, La, Y, Ce or Pr, which is capable of selectively entering into a perovskite A site and is exclusive of lead, M2 represents a trivalent or tetravalent metal ion, such as Ti, Zr, Ga, In, Ni, Mn or Fe, which is capable of selectively entering into a perovskite B site, M3 represents a trivalent metal ion, such as Bi, La, Y, Ce, Pr, Nd or Fe, which is capable of selectively entering into a perovskite A or B site, and x represents a number of 0.4 <= x <= 0.6. The above perovskite solid solution is completely free of lead and thus is friendly to the environment and also a piezoelectric ceramics being composed of the solid solution exhibits displacement characteristics tremendously higher than those of conventional piezoelectric materials used practically which are mainly PZT type ceramics.