| 摘要 |
A piezoelectric porcelain which comprises Pb>A<[(Mg>1/3<Nb>2/3<)>a<(Zn>1/3<Nb>2/3<)>b< Ti>c<Zr>d<]O>3<, wherein a + b + c + d = 1, 0.99 </= A </= 1.01, 0.15 </= a + b </= 0.5, 0.05 </= b </= 0.25, 0.2 </= c </= 0.5, 0.15 </= d </= 0.6, a s a primary component, and also at least one of Fe, Co, Ni and Cu as a first sub-component in an amount of 0.01 to 0.8 mass % relative to the primary component in terms of an oxide. In the main component, a part of Pb may be replaced by at least one of Ca, Sr and Ba. The piezoelectric porcelain may further comprise at least one of Sb, Nb and Ta as a second sub-component in an amount of 0.05 to 1.0 mass % relative to the primary component in terms of an oxide. The piezoelectric porcelain exhibits enhanced piezoelectric strain constant, and also can be fired at a reduced temperature.
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