Dielectric compositions

Claim 1

A composition for forming a densified dielectric body at low firing temperatures comprising a mixture of finely divided particles consisting essentially of (a) 95.5-99.4% wt. of a mixture of metal oxide, metal oxide precursors of polynary oxide reaction products thereof in molar proportions corresponding to the formula: ______________________________________ (Sr.sub.x Pb.sub.1-x TiO.sub.3).sub.a (PbMg.sub.r W.sub.s O.sub.3).sub.b, wherein x = 0-0.3 r = 0.45-0.55 a = 0.45-0.6 s = 0.55-0.45 and b = 1.55-0.4 and Σ(r + s) = 1, and Σ(a + b) = 1. ______________________________________ (b) 4.5-0.6% wt. of a mixture of metal oxides or precursors thereof consisting essentially of (1) 0.1-1.0% wt. of a binary oxide of a transition metal selected from the group consisting of Co, Ni, Cr, Mn and mixtures thereof, (2) 0.25-1.5% wt. of Cd titanate, Zn titanate or mixtures thereof, and (3) 0.25-2.0% wt. of a polynary oxide selected from the group consisting of Cd zirconate, Zn zirconate, Cd stannate, Zn stannate and mixtures thereof, substantially all the partices being less than 10 μm in largest dimension and having a surface area of at least 0.5 m 2 /g.