Dielectric ceramic capacitor comprising non-reducible dielectric
View Patent ↗A dielectric ceramic, and capacitor with the ceramic, wherein the ceramic has: about 94–99.9 wt % a first component defined by Formula 1; [(Ca 1-x Sr x )O] m (Zr 1-y Ti y )O 2 Formula 1 wherein: x is no more than about 0.6; and y is no more than about 0.1; and m is at least about 0.85 to no more than about 1.15; and about 0.1–5 wt % a secondary component defined by Formula 2; a SiO 2 - b [αB 2 O 3 -(1−α)Li 2 O]- c AOFormula 2 wherein: a, b and c are selected to lie within the region defined by points A(a=15, b=0, c=85), B(a=70, b=0, c=30), C(a=0, b=70, c=30) and D(a=0, b=15, c=85) of a ternary diagram wherein a is mole percent SiO2; b is mole percent αB 2 O 3 -(1−α)Li 2 O; and c is mole percent AO and a+b+c=100 including the lines BC, CD and AD but excluding the line AB; α is 0 to 1; A is selected from Mg, Ca, Sr, Ba or a combination thereof; and 0–2 wt % MnO 2 .
1. A dielectric ceramic comprising:
about 94–99.9 wt % a first component defined by Formula 1;
[(Ca 1-x Sr x )O] m (Zr 1-y Ti y )O 2 Formula 1
wherein:
x is no more than about 0.6; and
y is no more than about 0.1; and
m is at least about 0.85 to no more than about 1.15; and
about 0.1–5 wt % a secondary component defined by Formula 2;
a SiO 2 - b [αB 2 O 3 -(1−α)Li 2 O]- c AO Formula 2
wherein:
a, b and c are selected to lie within the region defined by points A(a=15, b=0, c=85), B(a=70, b=0, c=30), C(a=0, b=70, c=30) and D(a=0, b=15, c=85) of a ternary diagram wherein a is mole percent SiO2; b is mole percent αB 2 O 3 -(1−α)Li 2 O; and c is mole percent AO and a+b+c=100 including the lines BC, CD and AD but excluding the line AB;
α is 0 to 1;
A is selected from Mg, Ca, Sr, Ba or a combination thereof; and
0–2 wt % MnO 2 .
2. The dielectric ceramic of claim 1 comprising about 95 to about 99.5 wt % of said first component.
3. The dielectric ceramic of claim 2 comprising about 96 to about 99 wt % of said first component.
4. The dielectric ceramic of claim 1 comprising about 0.35 to about 4 wt % of said second component.
5. The dielectric ceramic of claim 4 comprising about 0.8 to about 2.5 wt % of said secondary component.
6. The dielectric ceramic of claim 1 comprising about 0.2 to about 1.5 wt % MnO 2 .
7. The dielectric ceramic of claim 6 comprising about 0.3 to about 1 wt % MnO 2 .
8. The dielectric ceramic of claim 1 wherein x is at least about 0.1 to no more than about 0.5.
9. The dielectric ceramic of claim 8 wherein x is at least about 0.2 to no more than about 0.4.
10. The dielectric ceramic of claim 1 wherein y is about 0.01 to about 0.07.
11. The dielectric ceramic of claim 10 wherein y is about 0.02 to about 0.05.
12. The dielectric ceramic of claim 1 wherein a is about 20 to about 30.
13. The dielectric ceramic of claim 1 wherein b is about 15 to about 30.
14. The dielectric ceramic of claim 1 wherein c is about 40 to about 70.
15. The dielectric ceramic of claim 14 wherein c is about 42 to about 60.
16. A capacitor comprising a dielectric of claim 1 .
17. A laminated ceramic capacitor comprising:
a plurality of inner electrode layers;
a plurality of dielectric layers between said inner electrode layers wherein said dielectric layers comprise a ceramic comprising:
about 94–99.9 wt % a first component defined by Formula 1;
[(Ca 1-x Sr x )O] m (Zr 1-y Ti y )O 2 Formula 1
wherein:
x is no more than about 0.6; and
y is no more than about 0.1; and
m is at least about 0.85 to no more than about 1.15; and
about 0.1–5 wt % a secondary component defined by Formula 2;
a SiO 2 - b [αB 2 O 3 -(1−α)Li 2 O]- c AO Formula 2
wherein:
a, b and c are selected to lie within the region defined by points A(a=15, b=0, c=85), B(a=70, b=0, c=30), C(a=0, b=70, c=30) and D(a=0, b=15, c=85) of a ternary diagram wherein a is mole percent SiO2; b is mole percent αB 2 O 3 -(1−α)Li 2 O; and c is mole percent AO and a+b+c=100 including the lines BC, CD and AD but excluding the line AB;
α is 0 to 1;
A is selected from Mg, Ca, Sr, Ba or a combination thereof;
and 0–2 wt % MnO 2 ;
and external electrodes in electrical conductivity with said inner electrode layers.
18. The dielectric ceramic of claim 17 comprising about 95 to about 99.5 wt % of said first component.
19. The dielectric ceramic of claim 18 comprising about 96 to about 99 wt % of said first component.
20. The laminated ceramic capacitor of claim 17 comprising about 0.35 to about 4 wt % of said secondary component.
21. The laminated ceramic capacitor of claim 17 wherein x is at least about 0.1 to no more than about 0.5.
22. The laminated ceramic capacitor of claim 21 wherein x is at least about 0.2 to no more than about 0.4.
23. The laminated ceramic capacitor of claim 17 wherein y is about 0.01 to about 0.07.
24. The laminated ceramic capacitor of claim 17 wherein y is about 0.02 to about 0.05.
25. The laminated ceramic capacitor of claim 17 wherein a is about 20 to about 30.
26. The laminated ceramic capacitor of claim 17 wherein b is about 15 to about 30.
27. The laminated ceramic capacitor of claim 17 wherein c is about 40 to about 70.
28. The laminated ceramic capacitor of claim 17 comprising about 0.2 to about 1.5 wt % MnO 2 .
29. The laminated ceramic capacitor of claim 28 comprising about 0.3 to about 1 wt % MnO 2 .
30. The laminated ceramic capacitor of claim 17 wherein said inner electrode layers comprise a metal.
31. The laminated ceramic capacitor of claim 17 wherein said metal is nickel.
32. A dielectric ceramic comprising:
about 95–99.5 wt % a first component defined by Formula 1;
[(Ca 1-x Sr x )O] m (Zr 1-y Ti y )O 2 Formula 1
wherein:
x is no more than about 0.6; and
y is no more than about 0.1; and
m is at least about 0.85 to no more than about 1.15; and
about 0.1 to about 5.0 wt % a secondary component defined by Formula 2;
a SiO 2 - b [αB 2 O 3 -(1−α)Li 2 O]- c AO Formula 2
wherein:
a, b and c are selected to lie within the region defined by points A(a=15, b=0, c=85), B(a=70, b=0, c=30), C(a=0, b=70, c=30) and D(a=0, b=15, c=85) of a ternary diagram wherein a is mole percent SiO2; b is mole percent αB 2 O 3 -(1−α)Li 2 O; and c is mole percent AO and a+b+c=100 including the lines BC, CD and AD but excluding the line AB;
α is 0 to 1;
A is selected from Mg, Ca, Sr, Ba or a combination thereof; and
about 0 to about 2 wt % MnO 2 .
33. The dielectric ceramic of claim 32 comprising about 96 to about 99 wt % of said first component.
34. The dielectric ceramic of claim 32 comprising about 0.35 to about 4 wt % of said secondary component.
35. The dielectric ceramic of claim 32 wherein x is at least about 0.1 to no more than about 0.5.
36. The dielectric ceramic of claim 35 wherein x is at least about 0.2 to no more than about 0.4.
37. The dielectric ceramic of claim 32 wherein y is 0.01 to 0.07.
38. The dielectric ceramic of claim 32 wherein a is about 20 to about 30.
39. The dielectric ceramic of claim 32 wherein b is about 15 to about 30.
40. The dielectric ceramic of claim 32 wherein c is about 40 to about 70.
41. A capacitor comprising the dielectric of claim 32 .