Young & Thompson
Dielectric ceramic composition
 A dielectric ceramic composition is herein disclosed which comprises four lead-containing perovskite compounds of (a) lead magnesium tungstate Pb(Mg.sub.1/2 W.sub.1/2)O.sub.3 !, (b) lead nickel niobate Pb(Ni.sub.1/3 Nb.sub.2/3)O.sub.3 !, (c) lead titanate (PbTiO.sub.3) and (d) lead zirconate (PbZrO.sub.3) as main components and which further contains an oxide of a rare earth element; and by adjusting a molar ratio of the components (a) to (d) and an amount of the oxide of the rare earth element in specific ranges, there can be obtained the dielectric ceramic composition suitable for a dielectric substance for a multilayer ceramic capacitor which has a low firing temperature, a high dielectric constant at room temperature and a low change rate of the dielectric constant to temperature. 
NEC Corporation
C C
C04B C04B
inventional inventional
Shinji Toru Tadahiko
Ito Mori Horiguchi