C0G multi-layered ceramic capacitor
View Patent ↗A dielectric ceramic composition in a multilayer ceramic capacitor with a composition of formula: {[(CaO) t (SrO) 1-t ] m [(ZrO 2 ) v (TiO 2 ) 1-v ]} 1-s-x A s E x wherein: A is a transition metal oxide; E is an oxide of an element selected from the group consisting of Ge, Si, Ga and combination thereof; m is 0.98 to 1.02; t is 0.50 to 0.90; v is 0.8 to 1.0; s and x are selected from the group consisting of: a) 0≦x≦0.08, 0.0001≦s≦0.043 and x≧1.86s; and b) 0≦0.0533, 0.0001≦s≦0.08 and x≦0.667s.
1. A dielectric ceramic composition in a multilayer ceramic capacitor consisting essentially of a composition of formula:
{[(CaO) t (SrO) 1-t ] m [(ZrO 2 ) v (TiO 2 ) 1-v ]} 1-s-x A s E x
wherein:
A is a transition metal oxide of a transition metal selected from Cu, Mn, Mo, W, Ta, Sc, Y, Hf, Nb and combinations there of;
E is an oxide of an element selected from the group consisting of Ge, Si, Ga and combinations thereof;
m is 0.98 to 1.02;
t is >0.5 and ≦0.9;
v is 0.8 to 1.0; and
s and x are selected from the group consisting of: a) x≦0.08, 0.0001≦s≦0.043 and x>1.86s; and b) 0<x≦0.0533, 0.0001≦s≦0.08 and x<0.667s.
2. The dielectric ceramic composition in a multilayer ceramic capacitor of claim 1 wherein s and x are defined by x≦0.08, 0.0001≦s≦0.043 and x>1.86s.
3. The dielectric ceramic composition in a multilayer ceramic capacitor of claim 1 wherein s and x defined by 0<x≦0.0533, 0.0001≦s≦0.08 and x<0.667s.
4. The dielectric ceramic composition in a multilayer ceramic capacitor of claim 1 wherein:
A is manganese oxide.
5. The dielectric ceramic composition in a multilayer ceramic capacitor of claim 1 wherein A is MnO and E is SiO 2 .
6. The dielectric ceramic composition in a multilayer ceramic capacitor of claim 1 which has been fired at a temperature between 1200° C. and 1350° C.
7. The dielectric ceramic composition in a multilayer ceramic capacitor of claim 1 wherein said capacitor further comprises a base metal as the internal electrode material.
8. The dielectric ceramic composition in a multilayer ceramic capacitor of claim 4 wherein said capacitor further comprises a base metal as the internal electrode material.
9. The dielectric ceramic composition in a multilayer ceramic capacitor of claim 5 wherein said capacitor further comprises a base metal as the internal electrode material.
10. The dielectric ceramic composition in a multilayer ceramic capacitor of claim 9 wherein said base metal is selected from the group consisting of Ni or Cu and a combination thereof.
11. The dielectric ceramic composition in a multilayer ceramic capacitor of claim 10 which has been fired in a reducing atmosphere.
12. The dielectric ceramic composition in a multilayer ceramic capacitor according to claim 11 further comprising a metal electrode selected from the group consisting of Ni, Cu.
13. A dielectric ceramic composition in a multilayer ceramic capacitor consisting essentially of a composition of formula:
{[(CaO) t (SrO) 1-t ] m [(ZrO 2 ) v (TiO 2 ) 1-v ]} 1-s-x A s E x
wherein:
A is a transition metal oxide of a transition metal selected from Cu, Mn, Mo, W, Ta, Nb and combinations there of;
E is an oxide of an element selected from the group consisting of Ge, Si, Ga and combinations thereof;
m is 0.98 to 1.02;
t is >0.5 and ≦0.9;
v is 0.8 to 1.0; and
s and x are selected from the group consisting of: a) x≦0.0001s≦0.043 and x>1.86s; and b) 0<x≦0.0533, 0.0001≦s≦0.08 and x<0.667s.
14. The dielectric ceramic of claim 1 wherein said ceramic composition has a temperature coefficient of capacitance (TCC) of ≦+/−30 ppm/° C.
15. The dielectric ceramic of claim 13 wherein said ceramic composition has a temperature coefficient of capacitance (TCC) of ≦+/−30 ppm/° C.