PIEZOELECTRIC PORCELAIN AND PIEZOELECTRIC CERAMIC ELEMENT

摘要

In the conventional production of piezoelectric porcelains, the firing temperature is as high as 950 to 1350°C, so that it has been inevitable to use Pd-Ag alloys wherein the content of extremely expensive Pd or Pd is high as a material of internal electrode co-fired with the piezoelectric porcelain in the production of piezoelectric elements. The production of piezoelectric porcelain through firing at lower temperatures has been realized by the employment of a composition of piezoelectric porcelain comprising 100 pts.wt. of main component of the formula (Ag<SUB>1-x-y</SUB>Li<SUB>x</SUB>K<SUB>y</SUB>)NbO<SUB>3</SUB> (wherein the relationships 0.075=x<0.4 and 0.03=y<0.3 are satisfied) and, mixed thereinto in an amount of 0.01 to 10 pts.wt. in terms of MO<SUB>2</SUB> (wherein M is Fe, Co, Ni, Cu, Zn or Bi), an oxide of at least one metal element selected from among Fe, Co, Ni, Cu, Zn and Bi.