Patent ID: 7309949

Claim:
A piezoelectric/electrostrictive porcelain composition comprising: a piezoelectric/electrostrictive component containing mainly a Pb(Mg 1/3 Nb 2/3 )O 3 —PbTiO 3 —PbZrO 3 ternary system solid solution; and 0.5 to 5% by mass of a glass component mainly composed of a ZnO—PbO—B 2 O 3 -based glass that contains SiO 2 in a range of 0.5% by mass to 8% by mass; wherein the Pb(Mg 1/3 Nb 2/3 )O 3 —PbTiO 3 —PbZrO 3 ternary system solid solution composition is represented by the following composition formula (1): Pb x (Mg 1/3 Nb 2/3 ) a Ti b Zr c O 3 (1), wherein 0.90≦x≦1.10, and a, b, c denote decimals in a range surrounded with (a, b, c)=(0.550, 0.425, 0.025), (0.550, 0.325, 0.125), (0.375, 0.325, 0.300), (0.100, 0.425, 0.475), (0.100, 0.475, 0.425), (0.375, 0.425, 0.200) in a coordinate including the above a, b, c as coordinates axes (additionally, a+b+c=1.000).