Leydig, Voit & Mayer
Ceramic composition
 A ceramic composition is herein disclosed, which is a lead-type perovskite compound capable of being subjected to low temperature-sintering among ceramic compositions for use in making capacitors, which has a high dielectric constant, low temperature-dependency thereof and a low decrease in capacitance upon application of a DC bias and which comprises a ternary system comprising lead magnesium niobate (Pb(Mg.sub.1/3 Nb.sub.2/3)O.sub.3), lead nickel niobate (Pb(Ni.sub.1/3 Nb.sub.2/3)O.sub.3) and lead titanate (PbTiO.sub.3).sub.z or a ternary system comprising lead magnesium tungstate (Pb(Mg.sub.1/2 W.sub.1/2)O.sub.3) lead titanate (PbTiO.sub.3) and lead nickel niobate (Pb(Ni.sub.1/3 Nb.sub.2/3)O.sub.3) and a desired amount of lanthanum manganese niobate La(Mn.sub.2/3 Nb.sub.1/3)O.sub.3) incorporated into the ternary system or a predetermined amount of La.sup.3+ or Ca.sup.2+ ions with which the Pb.sup.2+ ions present in the ternary system are substituted. 
NEC Corporation
H H H C
H01G H01G H01B C04B
inventional inventional inventional inventional
Atsushi Toru Mitsuru
Ochi Mori Furuya