# US 12,002,624 B2 · Capacitor

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- Number: US 12,002,624 B2
- Document ID: US12002624B2
- Status: Granted
- Kind: B2
- Application number: 17/784,915
- Filed: 2020-12-11
- Published: 2023-01-19
- Granted: 2024-06-04
- Earliest claimed: 2019-12-23
- Assignees: KYOCERA Corporation
- Applicants: KYOCERA Corporation
- Inventors: Katsuyoshi Yamaguchi
- Web page: https://patentgrep.com/patent/US12002624B2

## CPC

- H01G 4/1227: {based on alkaline earth titanates}
- H01G 4/30: Stacked capacitors (H01G4/33 takes precedence)
- C04B 35/468: based on barium titanates
- C04B 2235/3206: Magnesium oxides or oxide-forming salts thereof
- C04B 2235/3224: Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
- C04B 2235/3262: Manganese oxides, manganates, rhenium oxides or oxide-forming salts thereof, e.g. MnO
- C04B 2235/36: Glass starting materials for making ceramics, e.g. silica glass
- C04B 2235/5445: submicron sized, i.e. from 0,1 to 1 micron
- C04B 2235/6025: Tape casting, e.g. with a doctor blade
- C04B 2235/6562: Heating rate
- C04B 2235/6582: Hydrogen containing atmosphere
- C04B 2235/663: Oxidative annealing
- C04B 2235/725: Metal content
- C04B 2235/78: Grain sizes and shapes, product microstructures, e.g. acicular grains, equiaxed grains, platelet-structures
- C04B 2235/785: Submicron sized grains, i.e. from 0,1 to 1 micron
- C04B 2235/80: Phases present in the sintered or melt-cast ceramic products other than the main phase
- C04B 2237/68: Forming laminates or joining articles wherein at least one substrate contains at least two different parts of macro-size, e.g. one ceramic substrate layer containing an embedded conductor or electrode
- H01G 4/012: Form of non-self-supporting electrodes
- H01G 4/12: Ceramic dielectrics {(H01G4/085 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)
- 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

## Abstract

A capacitor body includes a plurality of dielectric layers and a plurality of internal electrode layers stacked alternately. The plurality of dielectric layers include crystal grains of barium titanate, a rare earth element, and silicon. The crystal grains include a first crystal grain and a second crystal grain. The crystal grains each include a surface layer as a shell and an interior portion surrounded by the shell as a core. The first crystal grain has a higher concentration distribution of the rare earth element in the shell than in the core. The second crystal grain has distribution in which a ratio of a concentration of the silicon in the core and the shell is lower than a ratio of a concentration of the rare earth element in the core and the shell in the first crystal grain.

## Claims

### Claim 1

A capacitor, comprising:
a capacitor body including a plurality of dielectric layers and a plurality of internal electrode layers stacked alternately,
the plurality of dielectric layers including crystal grains comprising barium titanate as a main component, a rare earth element, and silicon,
the crystal grains including a first crystal grain a second crystal grain,
the crystal grains each including a surface layer as a shell and an interior portion surrounded by the shell as a core,
the first crystal grain having a higher concentration distribution of the rare earth element in the shell than in the core,
the second crystal grain having
a higher concentration distribution of the rare earth element in the shell than in the core, and
a distribution in which a ratio of a concentration of the silicon in the core and the shell is lower than a ratio of a concentration of the rare earth element in the core and the shell in the first crystal grain.

### Claim 2 (depends on 1)

The capacitor according to claim 1, wherein
the capacitor body includes the plurality of dielectric layers each including the second crystal grain.

### Claim 3 (depends on 1)

The capacitor according to claim 1, wherein
the first crystal grain has a Csr-Ccr ratio of 2 to 20 inclusive, the Csr being a concentration of the rare earth element contained in the shell, the Ccr being the concentration of the rare earth element contained in the core.

### Claim 4 (depends on 1)

The capacitor according to claim 1, wherein
the second crystal grain has a Css-Ccs ratio of 1 to 1.5 inclusive, the Css being a concentration of silicon contained in the shell, the Ccs being a concentration of silicon contained in the core.

### Claim 5

A capacitor, comprising:
a capacitor body including a plurality of dielectric layers and a plurality of internal electrode layers stacked alternately,
the plurality of dielectric layers including crystal grains comprising barium titanate as a main component, a rare earth element, and silicon,
the crystal grains including a first crystal grain a second crystal grain,
the crystal grains each including a surface layer as a shell and an interior portion surrounded by the shell as a core,
the first crystal grain having a higher concentration distribution of the rare earth element in the shell than in the core,
the second crystal grain having a distribution in which a ratio of a concentration of the silicon in the core and the shell is lower than a ratio of a concentration of the rare earth element in the core and the shell in the first crystal grain, wherein
the plurality of dielectric layers include 80% or greater of the second crystal grain in terms of a ratio of the number of grains.

### Claim 6 (depends on 5)

The capacitor according to claim 5, wherein
the capacitor body includes the plurality of dielectric layers each including the second crystal grain.

### Claim 7 (depends on 5)

The capacitor according to claim 5, wherein
the first crystal grain has a Csr-Ccr ratio of 2 to 20 inclusive, the Csr being a concentration of the rare earth element contained in the shell, the Ccr being the concentration of the rare earth element contained in the core.

### Claim 8 (depends on 5)

The capacitor according to claim 5, wherein
the second crystal grain has a Css-Ccs ratio of 1 to 1.5 inclusive, the Css being a concentration of silicon contained in the shell, the Ccs being a concentration of silicon contained in the core.