Patent ID: 7022635

Claim:
A dielectric ceramic composition suitable for use in a temperature-stable base-metal-electrode multilayer ceramic capacitor comprising (A) 94 to 99 mol % barium titanate with an average grain size of 500 nm or less, and (B) 1 to 6 mol % of carbonate, hydroxide, oxalate, acetate, oxide or nitrate of additives, which provide in said ceramic (1) oxides of Mg, Ca, Ba, Si and Mn, and (2) oxides of one or more of Co, Sr, Ti or Fe, and (3) an oxide of RE, wherein RE represents one or more of Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb or Lu, wherein Si, Ba, Ca and Ti in the additives (B) are partially in the form of a glass component of formula (Ba A Ca (1-A) O x .(Si B Ti (1−B) O) 2 ), wherein 0≦A, B<1, 0.9≦x≦1.1, and the glass component is 1.5 to 3 wt % of the overall dielectric ceramic composition, and wherein the glass component is prepared by forming a mixture of oxides, carbonates, hydroxide, oxalates, acetates or nitrates of Si, Ba, Ca and Ti according to the values of A, B and x and calcining the mixture at 1000 to 1200° C.