Patent ID: 7998362

Claim:
A piezoelectric substance, wherein a main component of the piezoelectric substance is PZT which has a perovskite type structure expressed as Pb(Zr x Ti 1-x )O 3 , x expresses an element ratio Zr/(Zr+Ti) of Zr and Ti in the formula, an element ratio Pb/(Zr+Ti) of Pb, Zr and Ti of the piezoelectric substance is 1.05 or more, an element ratio Zr/(Zr+Ti) of Zr and Ti is 0.2 to 0.8 inclusive, and a Curie temperature Tc of the piezoelectric substance and a Curie temperature Tc 0 in bulk at the element ratio of Zr and Ti of the piezoelectric substance satisfy a relation of Tc>Tc 0 +50° C.