Multilayer ceramic capacitor and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-9058936-B2
Application number	US-201313929176-A
Country	US
Kind code	B2
Filing date	Jun 27, 2013
Priority date	Jun 27, 2012
Publication date	Jun 16, 2015
Grant date	Jun 16, 2015

Abstract

A multilayer ceramic capacitor uses internal electrodes which are embedded between the dielectric layers and whose primary constituent is Cu, wherein when the composition of the dielectric layer is expressed by 100Ca x ZrO 3 +aMnO 2 +bLiO 1/2 +cBO 3/2 +dSiO 2 +eAlO 3/2 , the contents of the respective constituents are 1.5≦a≦4.5 mol, 0.8≦b/(c+d)≦2.0, 0.9≦d/c≦1.5, and 0≦e≦0.3 mol relative to 100 mol of Ca x ZrO 3 (where 1.005≦x≦1.06), and when 10≦(b+c+d)≦14.9, an upper limit of x is defined by a line passing through (10, 1.03) and (14.9, 1.06), and a lower limit of x is defined by a line passing through (10, 1.005) and (14.9, 1.02), wherein the coordinates indicate ((b+c+d), x).

First claim

I claim:

1. A multilayer ceramic capacitor, comprising:
multiple dielectric layers;
internal electrodes which are embedded between the dielectric layers and whose primary constituent is Cu; and
external electrodes each connected electrically to one end of the internal electrodes;
wherein the dielectric layer contains a primary constituent of CaZrO 3 compound as well as secondary constituents that include at least Mn, Li, B, and Si, and when its composition is expressed by 100Ca x ZrO 3 +aMnO 2 +bLiO 1/2 +cBO 3/2 +dSiO 2 +eAlO 3/2 , contents of the respective constituents are as follows relative to 100 mol of Ca x ZrO 3 (where 1.005≦x≦1.06):
1.5 ≦a≦ 4.5 mol
0.8 ≦b /( c+d )≦2.0

0.9 ≦d/c≦ 1.5
0 ≦e≦ 0.3 mol;

and when 10≦(b+c+d)≦14.9, an upper limit of x is defined by a line passing through (10, 1.03) and (14.9, 1.06), and a lower limit of x is defined by a line passing through (10, 1.005) and (14.9, 1.02), wherein the coordinates indicate ((b+c+d), x) (where if CaO is contained as a secondary constituent, then x represents a value of Ca/Zr based on a total sum of the primary constituent of CaZrO 3 and this CaO constituent).

2. A multilayer ceramic capacitor according to claim 1 , wherein a to e are as follows:
2.5 ≦a≦ 4.5 mol
0.8 ≦b /( c+d )≦1.4

0.9 ≦d/c≦ 1.5
0.04 ≦e≦ 0.3 mol.

3. A multilayer ceramic capacitor according to claim 1 , wherein when 12≦(b+c+d)≦14.4, an upper limit of x is defined by a line passing through (12, 1.035) and (14.4, 1.055), and a lower limit of x is defined by a line passing through (12, 1.02) and (14.4, 1.025), wherein the coordinates indicate ((b+c+d), x).

4. A multilayer ceramic capacitor according to claim 2 , wherein when 12≦(b+c+d)≦14.4, an upper limit of x is defined by a line passing through (12, 1.035) and (14.4, 1.055), and a lower limit of x is defined by a line passing through (12, 1.02) and (14.4, 1.025), wherein the coordinates indicate ((b+c+d), x).

5. A multilayer ceramic capacitor according to claim 1 , wherein the dielectric layer does not contain Ba.

6. A multilayer ceramic capacitor according to claim 2 , wherein the dielectric layer does not contain Ba.

7. A multilayer ceramic capacitor according to claim 3 , wherein the dielectric layer does not contain Ba.

8. A multilayer ceramic capacitor according to claim 4 , wherein the dielectric layer does not contain Ba.

Assignees

• Taiyo Yuden Kk

Inventors

• Takeoka Shinsuke

Classifications

• H01G4/30 Primary

  Stacked capacitors (H01G4/33 takes precedence) · CPC title

• C04B35/486

  Fine ceramics · CPC title

• H01G4/0085

  Fried electrodes · CPC title

• H01G4/1236

  based on zirconium oxides or zirconates (H01G4/1263 takes precedence) · CPC title

• H01G4/12

  Ceramic dielectrics {(H01G4/085 takes precedence)} · CPC title