| 摘要 |
PROBLEM TO BE SOLVED: To provide a piezoelectric porcelain material capable of obtaining a piezoelectric porcelain sintered compact having such characteristics as a low electromechanical coupling factor, low resonance resistance and small temperature dependency of resonance frequency necessary for designing a filter having a narrow band. SOLUTION: This piezoelectric porcelain material contains at least Pb, Sr, Zr, Ti, Mn, Nb, Si and Al and contains a principal component having a composition of the formula (PbaSrb)(ZrcTidMneNbf)O3 (where 0. 93<=a<=1.01, 0.01<=b<=0.04, 0.37<=c<=0.47, 0.48<=d<=0.58, 0.0105<=e<=0.06, 0.02<=f<=0.06 and 1.05<=2e/f<=2) and 0. 003-0.1 wt.% SiO2 and 0.003-0.1 wt.% Al2O3, based on the amount of the principal components, as subsidiary components. |
