Perovskite ceramic composition, combined composition containing perovskite ceramic composition, method for manufacturing perovskite ceramic composition, and method for manufacturing multilayer ceramic capacitor

Patent metadata

Field	Value
Publication number	US-10468186-B2
Application number	US-201615378321-A
Country	US
Kind code	B2
Filing date	Dec 14, 2016
Priority date	Dec 17, 2015
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

A perovskite ceramic composition that contains Sn, Ba, and Ti, and where the Sn content is within a range of about 0.001 parts by mol≤Sn≤about 0.999 parts by mole with respect to 100 parts by mole of the Ti. The perovskite ceramic composition can be used in a composition that further includes a rare earth element R, Mn, and Si, and optionally Mg, where proportions of the R, the Mn, the Si, and the optional Mg, satisfy R: 0<R≤about 10 parts by mole, Mn: 0<Mn≤about 5 parts by mole, Si: 0<Si≤about 5 parts by mole Mg: 0<Mg≤about 5 parts by mole with respect to 100 parts by mole of Ti.

First claim

What is claimed is:

1. A perovskite ceramic composition comprising Sn, Ba, and Ti, wherein a content of the Sn is within a range of 0.200 parts by mol≤Sn≤0.800 parts by mole with respect to 100 parts by mole of the Ti.

2. The perovskite ceramic composition according to claim 1 , wherein the content of the Sn is 0.300 parts by mole≤Sn≤0.700 parts by mole.

3. A composition comprising:
(a) a perovskite ceramic composition according to claim 1 ; and
(b) a rare earth element R, Mn, and Si,
wherein, with respect to the 100 parts by mole of the Ti, proportions of the rare earth element R, the Mn, and the Si contained in the composition are:
R: 0.1≤R≤3 parts by mole,
Mn: 0.1≤Mn≤1 parts by mole,
Si: 0.1≤Si≤3 parts by mole.

4. The composition according to claim 3 , wherein
0.5≤R≤1.5 parts by mole,
0.3≤Mn≤0.5 parts by mole, and
1≤Si≤2 parts by mole.

5. A composition comprising:
(a) a perovskite ceramic composition according to claim 1 ; and
(b) a rare earth element R, Mn, Si, and Mg,
wherein, with respect to the 100 parts by mole of the Ti, proportions of the rare earth element R, the Mn, the Si, and the Mg contained in the composition are
R: 0.1≤R≤3 parts by mole,
Mn: 0.1≤Mn≤1 parts by mole,
Si: 0.1≤Si≤3 parts by mole, and
Mg: 0.05≤Mg≤2 parts by mole.

6. The composition according to claim 5 , wherein
0.5≤R≤1.5 parts by mole,
0.3≤Mn≤0.5 parts by mole,
1≤Si≤2 parts by mole, and
0.1≤Mg≤1 part by mole.

7. A method for manufacturing a perovskite ceramic composition, the method comprising:
mixing and firing a Sn compound, a Ba compound, and a Ti compound so as to synthesize a perovskite ceramic composition containing Sn, Ba, and Ti, where a content of the Sn is within a range of 0.200 parts by mol≤Sn≤0.800 parts by mole with respect to 100 parts by mole of the Ti.

8. The method for manufacturing a perovskite ceramic composition according to claim 7 , wherein the content of the Sn is 0.300 parts by mole≤Sn≤0.700 parts by mole.

9. A method for manufacturing a multilayer ceramic capacitor, the method comprising:
preparing a ceramic slurry by using a perovskite ceramic composition containing Sn, Ba, and Ti, where a content of the Sn is within a range of 0.200 parts by mol≤Sn≤0.800 parts by mole with respect to 100 parts by mole of the Ti;
forming ceramic green sheets from the ceramic slurry;
stacking the ceramic green sheets and inner electrode layers so as to form an unfired multilayer body; and
firing the unfired multilayer body so as to obtain a multilayer body in which the inner electrode layers are arranged between dielectric layers.

10. The method for manufacturing a multilayer ceramic capacitor according to claim 9 , wherein the content of the Sn is 0.300 parts by mole≤Sn≤0.700 parts by mole.

11. The method for manufacturing a multilayer ceramic capacitor according to claim 9 , further comprising:
adding a rare earth element R, Mn, and Si to the ceramic slurry, where, with respect to the 100 parts by mole of the Ti, proportions of the rare earth element R, the Mn, and the Si are
R: 0<R≤10 parts by mole,
Mn: 0<Mn≤5 parts by mole, and
Si: 0<Si≤5 parts by mole.

12. The method for manufacturing a multilayer ceramic capacitor according to claim 11 , wherein
0.1≤R≤3 parts by mole,
0.1≤Mn≤1 part by mole, and
0.1≤Si≤3 parts by mole.

13. The method for manufacturing a multilayer ceramic capacitor according to claim 11 , wherein
0.5≤R≤1.5 parts by mole,
0.3≤Mn≤0.5 parts by mole, and
1≤Si≤2 parts by mole.

14. The method for manufacturing a multilayer ceramic capacitor according to claim 11 , further comprising:
adding Mg to the ceramic slurry, where, with respect to the 100 parts by mole of the Ti, a proportion of the Mg is Mg: 0<Mg 5 parts by mole.

15. The method for manufacturing a multilayer ceramic capacitor according to claim 14 , wherein a primary component of the inner electrode layers is Ni, and the content of the Mg is 0≤Mg≤0.4 parts by mole.

Assignees

• Murata Manufacturing Co

Inventors

• Shimada Kohei
• Ishida Katsuya

Classifications

• H01G4/008

  Selection of materials · CPC title

• H01G4/1227 Primary

  based on alkaline earth titanates · CPC title

• C04B2235/3418

  Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint · CPC title

• C04B2235/3224

  Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide · CPC title

• C04B2235/768

  Perovskite structure ABO3 · CPC title