Invention Grant
- Patent Title: Multilayer ceramic capacitor
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Application No.: US16574232Application Date: 2019-09-18
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Publication No.: US11276527B2Publication Date: 2022-03-15
- Inventor: Keisuke Araki
- Applicant: Murata Manufacturing Co., Ltd.
- Applicant Address: JP Nagaokakyo
- Assignee: Murata Manufacturing Co., Ltd.
- Current Assignee: Murata Manufacturing Co., Ltd.
- Current Assignee Address: JP Nagaokakyo
- Agency: Arent Fox LLP
- Priority: JPJP2018-182057 20180927
- Main IPC: H01G4/12
- IPC: H01G4/12 ; H01G4/012 ; H01G4/248 ; H01G4/30

Abstract:
A multilayer ceramic capacitor that includes a laminate having a plurality of dielectric layers and a plurality of internal electrodes that are alternately stacked, and external electrodes. Each of the dielectric layers contains first crystal grains and second crystal grains that each contain Ba, Ti, and a rare-earth element. A first mole ratio M1 of the rare-earth element to the Ti in a range from an interface to 50 nm inclusive of the first crystal grains and a second mole ratio M2 of the rare-earth element to the Ti in a range of 50 nm to 100 nm inclusive from the interface satisfy 0.95≤M1/M2≤1.05. A third mole ratio M3 of the rare-earth element to the Ti in the second crystal grains is half or less of a fourth mole ratio M4 of the rare-earth element to the Ti in the first crystal grains.
Information query