Patent ID: 6844661

Claim:
A piezoelectric ceramic composition comprising Pb(Ni 1/3 Nb 2/3 )O 3 , PbTiO 3 , and PbZrO 3 , wherein: a composition of Pb(Ni 1/3 Nb 2/3 )O 3 , PbTiO 3 , and PbZrO 3 exists in an area in a triangular coordinate system defined by apexes of Pb(Ni 1/3 Nb 2/3 )O 3 , PbTiO 3 , and PbZrO 3 , the area being surrounded by lines for connecting a point A (X=40, Y=37, Z=23), a point B (X=36, Y=37, Z=27), a point C (X=33, Y=40, Z=27), and a point D (X=37, Y=40, Z=23), when Pb(Ni 1/3 Nb 2/3 )O 3 amounts to X molar %, PbTiO 3 amounts to Y molar %, and PbZrO 3 amounts to Z molar % (X+Y+Z=100).