| 摘要 |
The ceramic composition comprises lead magnesium tungstate [Pb(Mg1/2 W1/2)O3], lead titanate [PbTiO3] and lead nickel niobate [Pb(Ni1/3 Nb2/3)O3]. When the ternary composition is expressed by [Pb(Mg1/2 W1/2)O3]x [PbTiO3]y [Pb(Ni1/3Nb2/3)O3]z where x+y+z=1.00, it lies on lines interconnecting five points (x=0.693, y=0.297, z=0.01), (x=0.495, y=0.495, z=0.01), (x=0.195, y=0.465, z=0.35), (x=0.10, y=0.40, z=0.50) and (x=0.06, y=0.24, z=0.70) and in a region bonded by the lines. In modifications, for the purpose of improving the mechanical strength, 0.02 to 3 mol % of at least one auxiliary ingredient selected from the group consisting of Nb, Ta and Sb, 0.05 to 8 mol % of [Pb(Mn1/3 Ta2/3)O3] 0.05 to 10 mol % of [Pb(Mn1/3 Nb2/3)O3] or 0.05 to 6 mol % of [Pb(Mn1/3 Sb2/3)O3] is added.
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