| 摘要 |
A ceramic composition comprising a solid solution of the ternary system consisting essentially of lead magnesium-niobate (Pb(Mg1/3Nb hd 2/3)O3), lead nickel-niobate (Pb(Ni1/3Nb2/3)O3) and lead titanate (PbTiO3) as a major constituent, and an additional constituent consisting essentially of lead manganese-niobate (Pb(Mn1/3Nb2/3)O3). The ternary system is expressed by the general formula [Pb(Mg1/3Nb2/3)O3]x-[Pb(Ni1/3Nb2/3)O3]y-[PbTiO3]z wherein the subscripts x, y and z satisfy the equation x+y+z=1 and fall within the region defined by the line segments joining the seven points A, B, C, D, E, F and G within the triangular ternary-system diagram shown in the accompanying drawing. Preferably, the lead manganese-niobate (Pb(Mn1/3Nb2/3)O3) is contained in a proportion of 0.01 mol % to 10 mol % to the major constituent.
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