# US 2019/0172641 A1 · Dielectric composition and multilayer ceramic capacitor containing the same

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- Number: US 2019/0172641 A1
- Document ID: US20190172641A1
- Status: Published application
- Kind: A1
- Application number: 16/267,534
- Filed: 2019-02-05
- Published: 2019-06-06
- Earliest claimed: 2016-11-09
- Assignees: Samsung Electro-Mechanics Co., Ltd.
- Applicants: Samsung Electro-Mechanics Co., Ltd.
- Inventors: Jin Woo KIM; Jong Ho LEE; Min Gi SIN; Hak Kwan KIM; Chin Mo KIM; Chi Hwa LEE; Hong Seok KIM; Woo Sup KIM; Chang Hwa PARK
- Web page: https://patentgrep.com/patent/US20190172641A1

## CPC

- H01G 4/1227: {based on alkaline earth titanates}
- C01G 23/00: Compounds of titanium {(preparation of Ti-compounds from ores or scraps C22B34/12)}
- C01G 23/006: {Alkaline earth titanates}
- C04B 35/4682: {based on BaTiO3 perovskite phase}
- C04B 35/62805: {Oxide ceramics}
- C04B 35/6281: {Alkaline earth metal oxides}
- C04B 35/62821: {Titanium oxide}
- H01G 4/10: Metal-oxide dielectrics {(H01G4/085 takes precedence)}
- H01G 4/30: Stacked capacitors (H01G4/33 takes precedence)
- H01G 4/33: Thin- or thick-film capacitors {(thin- or thick-film circuits; capacitors without a potential-jump or surface barrier specially adapted for integrated circuits, details thereof, multistep manufacturing processes therefor)}
- C01P 2004/64: Nanometer sized, i.e. from 1-100 nanometer
- C01P 2004/80: Particles consisting of a mixture of two or more inorganic phases
- C04B 2235/3206: Magnesium oxides or oxide-forming salts thereof
- C04B 2235/3208: Calcium oxide or oxide-forming salts thereof, e.g. lime
- C04B 2235/3215: Barium oxides or oxide-forming salts thereof
- C04B 2235/3217: Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B 2235/3224: Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
- C04B 2235/3225: Yttrium oxide or oxide-forming salts thereof
- C04B 2235/3227: Lanthanum oxide or oxide-forming salts thereof
- C04B 2235/3229: Cerium oxides or oxide-forming salts thereof
- C04B 2235/3234: Titanates, not containing zirconia
- C04B 2235/3244: Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
- C04B 2235/3248: Zirconates or hafnates, e.g. zircon
- C04B 2235/3249: containing also titanium oxide or titanates, e.g. lead zirconate titanate (PZT)
- C04B 2235/3262: Manganese oxides, manganates, rhenium oxides or oxide-forming salts thereof, e.g. MnO
- C04B 2235/3272: Iron oxides or oxide forming salts thereof, e.g. hematite, magnetite
- C04B 2235/3275: Cobalt oxides, cobaltates or cobaltites or oxide forming salts thereof, e.g. bismuth cobaltate, zinc cobaltite
- C04B 2235/3279: Nickel oxides, nickalates, or oxide-forming salts thereof
- C04B 2235/3281: Copper oxides, cuprates or oxide-forming salts thereof, e.g. CuO or Cu2O
- C04B 2235/3284: Zinc oxides, zincates, cadmium oxides, cadmiates, mercury oxides, mercurates or oxide forming salts thereof
- C04B 2235/3293: Tin oxides, stannates or oxide forming salts thereof, e.g. indium tin oxide [ITO]
- C04B 2235/3418: Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
- C04B 2235/36: Glass starting materials for making ceramics, e.g. silica glass
- C04B 2235/442: Carbonates
- H01G 4/232: electrically connecting two or more layers of a stacked or rolled capacitor
- H01G 4/248: the terminals embracing or surrounding the capacitive element, e.g. caps (H01G4/252 takes precedence)
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)
- C01G: COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts or peroxyacids C01B15/00; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium, or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds containing nitrogen, other non-metals and metal C01B21/082}; metal amides C01B21/092; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanamide C01C3/16; thiocyanates C01C3/20)
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

A multilayer ceramic capacitor includes: a ceramic body including dielectric layers and first and second internal electrodes disposed to face each other with respective dielectric layers interposed therebetween; and first and second external electrodes disposed on an external surface of the ceramic body, wherein the dielectric layer contains a barium titanate-based powder particle having a core-shell structure including a core and a shell around the core, the shell having a structure in which titanium is partially substituted with an element having the same oxidation number as that of the titanium in the barium titanate-based powder particle and having an ionic radius different from that of the titanium in the barium titanate-based powder particle, and the shell covers at least 30% of a surface of the core.

## Claims

### Claim 1

A multilayer ceramic capacitor comprising:
a ceramic body including dielectric layers and first and second internal electrodes disposed to face each other with respective dielectric layers interposed therebetween; and
first and second external electrodes disposed on an external surface of the ceramic body,
wherein each dielectric layer contains a barium titanate-based powder particle having a core-shell structure including a core and a shell around the core, the shell including Ba(Ti1-xMx)O3 in which titanium is partially substituted with an element M including at least one of Sn and Hf, and the shell covering at least 30% of a surface of the core.

### Claim 2 (depends on 1)

The multilayer ceramic capacitor of claim 1, wherein M is Sn.

### Claim 3 (depends on 1)

The multilayer ceramic capacitor of claim 1, wherein the core includes M, and a content ratio of M in the core to that in the shell is 1/10 or more.

### Claim 4 (depends on 1)

The multilayer ceramic capacitor of claim 1, wherein a molar ratio (Ba/Ti) of Ba to Ti is 1.0150 or more.

### Claim 5 (depends on 1)

The multilayer ceramic capacitor of claim 1, wherein in each dielectric layer, the shell covers at least 50% of the surface of the core before sintering.

### Claim 6 (depends on 5)

The multilayer ceramic capacitor of claim 5, wherein in each dielectric layer, the number of dielectric grains of which the shell covers at least 50% of the surface of the core before sintering and covers at least 30% of the surface of the core after sintering is within a range of 35 to 85% of the overall number of dielectric grains.

### Claim 7 (depends on 1)

The multilayer ceramic capacitor of claim 1, wherein the shell has a thickness within a range of 2 nm to 50 nm.

### Claim 8 (depends on 1)

The multilayer ceramic capacitor of claim 1, wherein the core includes M, and a content ratio of M in the core to that in the shell is ⅕ or more before sintering and 1/10 or more after sintering.

### Claim 9

A dielectric composition comprising:
a barium titanate-based powder particle having a core-shell structure including a core and a shell around the core,
wherein the shell has a structure in which titanium is partially substituted with an element having the same oxidation number as that of titanium and having an ionic radius different from that of titanium, and the shell contains at least one of Sn and Hf.

### Claim 10 (depends on 9)

The dielectric composition of claim 9, wherein the at least one of Sn and Hf is coated or doped on the core.

### Claim 11 (depends on 9)

The dielectric composition of claim 9, wherein the shell has a radius within a range of 2% to 30% of a radius of the barium titanate-based powder particle.

### Claim 12 (depends on 9)

The dielectric composition of claim 9, wherein the shell covers at least 50% of a surface of the core.

### Claim 13 (depends on 9)

The dielectric composition of claim 9, wherein the core includes the at least one of Sn and Hf, and a content ratio of the at least one of Sn and Hf in the core to that in the shell is ⅕ or more.

### Claim 14 (depends on 9)

The dielectric composition of claim 9, further comprising:
an oxide or carbonate containing at least one of Mn, V, Cr, Fe, Ni, Co, Cu, and Zn in a content within a range of 0.2 to 2.0 at % based on 100 at % of the barium titanate-based powder particle;
an oxide or carbonate containing at least one of Ba and Ca, in a content of 0.0 to 3.0 at % based on 100 at % of the barium titanate-based powder particle;
an oxide or carbonate containing Si or the glass compound containing Si, in a content of 0.2 to 5.0 at % based on 100 at % of the barium titanate-based powder particle;
an oxide or carbonate containing at least one of Y, Dy, Ho, Er, Gd, Ce, Nd, Sm, La, Tb, Yb, and Pr, in a content of 0.0 to 4.0 at % based on 100 at % of the barium titanate-based powder particle; and
an oxide or carbonate containing Mg or Al in a content of 0.0 to 2.0 at % based on 100 at % of the barium titanate-based powder particle.

### Claim 15 (depends on 1)

The multilayer ceramic capacitor of claim 1, wherein M has the same oxidation number as that of the titanium in the barium titanate-based powder particle and has an ionic radius different from that of the titanium in the barium titanate-based powder particle.

### Claim 16 (depends on 1)

The multilayer ceramic capacitor of claim 1, wherein M is Hf.

### Claim 17 (depends on 9)

The dielectric composition of claim 9, wherein the shell contains Sn.

### Claim 18 (depends on 9)

The dielectric composition of claim 9, wherein the shell contains Hf.

### Claim 19

A multilayer ceramic capacitor comprising:
a ceramic body including dielectric layers and first and second internal electrodes disposed to face each other with respective dielectric layers interposed therebetween; and
first and second external electrodes disposed on an external surface of the ceramic body,
wherein each dielectric layer contains a barium titanate-based powder particle having a core-shell structure including a core and a shell around the core, the shell having a structure in which titanium is partially substituted with an element having the same oxidation number as that of the titanium in the barium titanate-based powder particle and having an ionic radius different from that of the titanium in the barium titanate-based powder particle, and a number of dielectric grains of which the shell covers at least 30% of the surface of the core after sintering is within a range of 35 to 85% of the overall number of dielectric grains.