# US 11,306,031 B2 · Multilayer ceramic capacitor

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,306,031 B2
- Document ID: US11306031B2
- Status: Granted
- Kind: B2
- Application number: 16/778,693
- Filed: 2020-01-31
- Published: 2020-05-28
- Granted: 2022-04-19
- Earliest claimed: 2017-09-29
- Assignees: Samsung Electro-Mechanics Co., Ltd.
- Applicants: Samsung Electro-Mechanics Co., Ltd.
- Inventors: Seok Hyun Yoon; Jung Deok Park; Chan Hee Nam; Dong Hun Kim
- Web page: https://patentgrep.com/patent/US11306031B2

## CPC

- C04B 35/4682: {based on BaTiO3 perovskite phase}
- B32B 18/00: Layered products essentially comprising ceramics, e.g. refractory products
- C04B 35/49: containing also titanium oxides or titanates
- H01B 3/12: ceramics
- H01G 4/1218: {based on titanium oxides or titanates (H01G4/1245 takes precedence)}
- H01G 4/1227: {based on alkaline earth titanates}
- H01G 4/30: Stacked capacitors (H01G4/33 takes precedence)
- C04B 2235/32: Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- 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 2235/3239: Vanadium oxides, vanadates or oxide forming salts thereof, e.g. magnesium vanadate
- C04B 2235/3241: Chromium oxides, chromates, or oxide-forming salts thereof
- C04B 2235/3244: Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
- 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 2235/3418: 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
- C04B 2235/5445: submicron sized, i.e. from 0,1 to 1 micron
- C04B 2235/5454: nanometer sized, i.e. below 100 nm
- C04B 2235/5463: Particle size distributions
- C04B 2235/6582: Hydrogen containing atmosphere
- C04B 2235/663: Oxidative annealing
- C04B 2237/348: Zirconia, hafnia, zirconates or hafnates
- C04B 2237/704: of one or more of the ceramic layers or articles
- 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
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- 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)

## Abstract

A multilayer ceramic capacitor includes: a ceramic body in which dielectric layers and first and second internal electrodes are alternately stacked; and first and second external electrodes formed on an outer surface of the ceramic body and electrically connected to the first and second internal electrodes, respectively. In a microstructure of the dielectric layer, dielectric grains are divided by a dielectric grain size into sections each having an interval of 50 nm, respectively, a fraction of the dielectric grains in each of the sections within a range of 50 nm to 450 nm is within a range of 0.025 to 0.20, and a thickness of the dielectric layer is 0.8 μm or less.

## Claims

### Claim 1

A multilayer ceramic capacitor comprising:
a ceramic body in which dielectric layers and first and second internal electrodes are alternately stacked; and
first and second external electrodes disposed on an outer surface of the ceramic body and electrically connected to the first and second internal electrodes, respectively,
wherein when, in a microstructure of the dielectric layer, dielectric grains, each having a grain size in a range of 50 nm to 450 nm, inclusive, are divided into respective sequential sections each having a range of 50 nm, a fraction of the dielectric grains in each of the sections is within a range of 0.025 to 0.20, and
a thickness of the dielectric layer is 0.8 μm or less.

### Claim 2 (depends on 1)

The multilayer ceramic capacitor of claim 1, wherein the dielectric layer is formed of a dielectric ceramic composition containing a barium titanate based base material main ingredient and an accessory ingredient,
the accessory ingredient including:
a first accessory ingredient containing one or more selected from the group consisting of oxides and carbonates of one or more variable-valence acceptor elements among Mn, V, Cr, Fe, Ni, Co, Cu, and Zn;
a second accessory ingredient containing one or more of oxides and carbonates of fixed-valence acceptor elements including Mg;
a third accessory ingredient containing one or more selected from the group consisting of oxides and carbonates of one or more elements among Y, Dy, Ho, Sm, Gd, Er, La, Ce, Tb, Tm, Yb, and Nd;
a fourth accessory ingredient containing one or more selected from the group consisting of oxides and carbonates of Ba;
a fifth accessory ingredient containing one or more selected from the group consisting of oxides and carbonates of Ca and Zr; and
a sixth accessory ingredient containing one or more selected from the group consisting of oxides or carbonates of Si and Al, and glass containing Si.

### Claim 3 (depends on 2)

The multilayer ceramic capacitor of claim 2, wherein the accessory ingredient includes the first accessory ingredient containing one or more selected from the group consisting of the oxides and the carbonates of one or more variable-valence acceptor elements among Mn, V, Cr, Fe, Ni, Co, Cu, and Zn, and
a sum of contents of one or more variable-valence acceptor elements among Mn, V, Cr, Fe, Ni, Co, Cu, and Zn contained in the first accessory ingredient is within a range from 0.1 to 2.0 parts by mole, based on 100 parts by mole of the base material main ingredient.

### Claim 4 (depends on 2)

The multilayer ceramic capacitor of claim 2, wherein the accessory ingredient includes the second accessory ingredient containing one or more of the oxides and carbonates of the fixed-valence acceptor elements including Mg, and
a content of the fixed-valence acceptor elements including Mg contained in the second accessory ingredient is 2.0 parts by mole or less, based on 100 parts by mole of the base material main ingredient.

### Claim 5 (depends on 2)

The multilayer ceramic capacitor of claim 2, wherein the accessory ingredient includes the third accessory ingredient containing one or more selected from the group consisting of the oxides and the carbonates of one or more elements among Y, Dy, Ho, Sm, Gd, Er, La, Ce, Tb, Tm, Yb, and Nd, and
a sum of contents of one or more elements among Y, Dy, Ho, Sm, Gd, Er, La, Ce, Tb, Tm, Yb, and Nd contained in the third accessory ingredient is 4.0 parts by mole or less, based on 100 parts by mole of the base material main ingredient.

### Claim 6 (depends on 2)

The multilayer ceramic capacitor of claim 2, wherein the accessory ingredient includes the fourth accessory ingredient containing one or more selected from the group consisting of the oxides and carbonates of Ba, and
a content of Ba contained in the fourth accessory ingredient is 4.0 parts by mole or less, based on 100 parts by mole of the base material main ingredient.

### Claim 7 (depends on 2)

The multilayer ceramic capacitor of claim 2, wherein the accessory ingredient includes the fifth accessory ingredient containing one or more selected from the group consisting of the oxides and carbonates of Ca and Zr, and
a content (based on Ca and Zr) of one or more elements among Ca and Zr contained in the fifth accessory ingredient is 10 parts by mole or less, based on 100 parts by mole of the base material main ingredient.

### Claim 8 (depends on 2)

The multilayer ceramic capacitor of claim 2, wherein the accessory ingredient includes the sixth accessory ingredient containing one or more selected from the group consisting of the oxides or carbonates of Si and Al, and the glass containing Si, and
a content of one or more elements among Si and Al contained in the sixth accessory ingredient is 4.0 parts by mole or less, based on 100 parts by mole of the base material main ingredient.

### Claim 9 (depends on 2)

The multilayer ceramic capacitor of claim 2, wherein the base material main ingredient has a particle size of 120 nm or less.

### Claim 10 (depends on 2)

The multilayer ceramic capacitor of claim 2, wherein the base material main ingredient contains one or more selected form the group consisting of BaTiO3, and (Ba1-xCax)(Ti1-yCay)O3, (Ba1-xCax)(Ti1-yZry)O3, or Ba(Ti1-yZry)O3 in which Ca, Zr, or the like, is partially solid-dissolved.