Laminated ceramic capacitor
AssigneeMurata Manufacturing Co., Ltd.
InventorTakayuki Yao
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Abstract
Provided is a laminated ceramic capacitor that can suppress the decrease in insulation resistance after a moisture-resistance loading test. It contains ceramic layers which include: main-phase grains that have a perovskite-type compound containing Ba and Ti and optionally containing Ca, Sr, Zr, and Hf; and secondary-phase grains that have an average grain size of 100 nm or more and have a Si content of 50 mol % or more per grain, the average grain boundary number, represented by (Average Thickness for Ceramic Layers 3)/(Average Grain Size for Main Phase Grains)−1, is greater than 0 and 3.0 or less, and the average grain size for the secondary-phase grains is ¼ or more of the average thickness for the ceramic layers 3.
Claims12
A laminated ceramic capacitor comprising:
- a laminate comprising a plurality of stacked ceramic layers and a plurality of internal electrodes disposed at interfaces between the ceramic layers;
- and a plurality of external electrodes on an outer surface of the laminate and electrically connected to the internal electrodes,
- wherein the ceramic layers comprise:
- main-phase grains having a perovskite-type compound containing Ba and Ti and optionally containing one or more of Ca, Sr, Zr, and Hf;
- and
- secondary-phase grains having an average grain size of 100 nm or more and having a Si content (calculated after excluding oxygen) of 50 mol % or more per grain,
- the average grain boundary number, (Average Thickness for Ceramic Layers)/(Average Grain Size for Main Phase Grains)−1, is greater than 0 and 3.0 or less, and
- the average grain size of the secondary-phase grains is ¼ or more of the average thickness for the ceramic layers.
Dependencies are inferred from the claim text.