Invention Grant
- Patent Title: Multilayer ceramic capacitor having high moisture resistance
- Patent Title (中): 具有高耐湿性的多层陶瓷电容器
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Application No.: US14541212Application Date: 2014-11-14
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Publication No.: US09263190B2Publication Date: 2016-02-16
- Inventor: Kazuhisa Uchida , Yoshito Saito , Jun Ikeda
- Applicant: Murata Manufacturing Co., Ltd.
- Applicant Address: JP Kyoto
- Assignee: Murata Manufacturing Co., Ltd.
- Current Assignee: Murata Manufacturing Co., Ltd.
- Current Assignee Address: JP Kyoto
- Agency: Keating & Bennett, LLP
- Priority: JP2013-272164 20131227
- Main IPC: H01G4/12
- IPC: H01G4/12 ; H01G4/30 ; H01G4/012

Abstract:
In a multilayer ceramic capacitor, an inner ceramic layer includes a perovskite-type compound containing Ba and Ti. A region within an electrically effective portion of the inner ceramic layers sandwiched between inner electrodes, which is near an area where inner and outer electrodes connect to each other, is subjected to a mapping analysis using EDS. ((L2−L3)/L1)×100≧50 is satisfied, L1 denotes a total length of ceramic grain boundaries detected from a TEM transmission image, L2 denotes a total length of grain boundaries, detected from a mapping image and the TEM transmission image, where the rare earth element is present, and L3 denotes a total length of portions, detected from a mapping image and the TEM transmission image, in which the grain boundaries where the rare earth element is present and grain boundaries where at least one of Mn, Mg, and Si is present are overlapped.
Public/Granted literature
- US20150187498A1 MULTILAYER CERAMIC CAPACITOR Public/Granted day:2015-07-02
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