Ceramic electronic device having an element body with a boundary layer including Ba and Ti at an end of a ceramic layer
AssigneeTDK Corporation
InventorsToshihiro Iguchi, Yuichiro Sueda, Ryota Namiki
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Abstract
A ceramic electronic device includes an element body and an external electrode. The element body is formed by laminating a ceramic layer and an internal electrode layer. The external electrode is electrically connected to at least one end of the internal, electrode layer. The element body includes a boundary layer at an end of the ceramic layer. The ceramic layer includes a perovskite compound represented by ABO3 as a main component. The boundary layer includes Ba and Ti as a main component. The boundary layer includes 0.27-0.40 parts by mol of Ba, provided that a total of Ba and Ti included in the boundary layer is 1 part by mol.
Claims10
A ceramic electronic device comprising:
- an element body formed by laminating a ceramic layer and an internal electrode layer;
- and
- an external electrode electrically connected to at least one end of the internal electrode layer,
- wherein
- the element body includes a boundary layer at an end of the ceramic layer,
- the ceramic layer includes a perovskite compound represented by ABO3 as a main component,
- the boundary layer includes Ba and Ti as a main component, and
- the boundary layer includes 0.27-0.40 parts by mol of Ba, provided that a total of Ba and Ti included in the boundary layer is 1 part by mol.
A ceramic electronic device comprising:
- an element body formed by laminating a ceramic layer and an internal electrode layer;
- and
- an external electrode electrically connected to at least one end of the internal electrode layer,
- wherein
- the element body includes a boundary layer at an end of the ceramic layer,
- a magnitude correlation between α, β, and γ satisfies β>γ>α, where a is a linear expansion coefficient of the ceramic layer, β is a linear expansion coefficient of the external electrode, and γ is a linear expansion coefficient of the boundary layer,
- the external electrode includes an interface protrusion on at least a part of a surface of the boundary layer, and
- a magnitude correlation between α, β, γ, and δ satisfies β>γ>α>δ, where δ is a linear expansion coefficient of the interface protrusion.
Dependencies are inferred from the claim text.