Title:
LAMINATED CERAMIC CAPACITOR
Document Type and Number:
WIPO Patent Application WO/2012/043427
Kind Code:
A1
Abstract:
[Problem] To provide a laminated ceramic capacitor having a low relative permittivity and temperature coefficient of capacitance and an excellent life characteristic, and using Cu in the internal electrodes, by using a dielectric ceramic the primary component of which is CaZrO3.
[Solution]
A laminated ceramic capacitor having multiple dielectric layers, internal electrodes having Cu as the primary component and embedded between the dielectric layers, and external electrodes electrically connected to one end of the internal electrodes. The dielectric layers contain a primary component comprised of a CaZrO3 compound and auxiliary components that include Mn, B, Si, and Li. A primary phase comprised of the aforementioned primary component, a segregation phase containing Ca and at least one of the auxiliary components, and a secondary phase containing at least Ca and Zr are formed in the aforementioned dielectric layers. The ratio of Ca to Zr in the secondary phase is smaller than the ratio of ratio of Ca to Zr in the primary phase, and the number of secondary phases with a diameter of 100 nm or greater in a cross section of the aforementioned dielectric layers averages 30 or less per 10 square μm.
Inventors:
TAKEOKA SHINSUKE (JP)
Application Number:
PCT/JP2011/071786
Publication Date:
April 05, 2012
Filing Date:
September 26, 2011
Export Citation:
Assignee:
TAIYO YUDEN KK (JP)
TAKEOKA SHINSUKE (JP)
TAKEOKA SHINSUKE (JP)
International Classes:
H01G4/12; C04B35/47; H01G4/30
Foreign References:
| JP2009007209A | 2009-01-15 |
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Claims: