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CN-122025416-A - Laminated ceramic electronic component

CN122025416ACN 122025416 ACN122025416 ACN 122025416ACN-122025416-A

Abstract

The invention provides a laminated ceramic electronic component capable of suppressing adverse effects on electrical characteristics of a capacitor portion and improving moisture resistance. A laminated ceramic electronic component comprises a dielectric layer (11), internal electrode layers (12) facing each other through the dielectric layer (11), a cover layer (13), and side edges (16), wherein at least a partial region (60) of an outer peripheral portion (30) formed by the cover layer (13) and the side edges (16) contains barium titanate as a main component, and the concentration of aluminum in the dielectric layer (11) is greater than or equal to 0.1mol% boron, greater than or equal to 1.0mol% silicon, and greater than or equal to 1.0mol% aluminum, and the concentration of magnesium is less than or equal to 0.1mol%, and the concentration of manganese is greater than or equal to 0.1mol% when the concentration of titanium in the at least partial region (60) is 100mol% titanium.

Inventors

  • MORITA KOICHIRO

Assignees

  • 太阳诱电株式会社

Dates

Publication Date
20260512
Application Date
20251111
Priority Date
20241111

Claims (7)

  1. 1. A laminated ceramic electronic component comprising: A dielectric layer; an internal electrode layer opposing each other across the dielectric layer; A cover layer provided outside the outermost internal electrode layer in a first direction, the first direction being a lamination direction of the dielectric layer and the internal electrode layer; A side edge adjacent to the dielectric layer and the internal electrode layer in a second direction orthogonal to the first direction, and An external electrode provided adjacent to the internal electrode layer in a third direction orthogonal to the first direction and the second direction and electrically connected to the internal electrode layer, At least a part of the outer peripheral portion formed by the cover layer and the side edges contains barium titanate as a main component, and in the at least a part of the area, when the titanium of the barium titanate is 100mol%, the barium titanate contains 0.1mol% or more of boron, 1.0mol% or more of silicon, and 1.0mol% or more of aluminum, the magnesium is less than 0.1mol%, the manganese is less than 0.1mol%, and the aluminum concentration is equal to or higher than the aluminum concentration of the dielectric layer.
  2. 2. The laminated ceramic electronic component according to claim 1, wherein: In the at least a part of the region, the boron concentration is 2.5mol% or less, assuming that the titanium of the barium titanate is 100 mol%.
  3. 3. The laminated ceramic electronic component according to claim 1 or 2, characterized in that: In the at least a part of the region, the concentration of silicon is 3.0mol% or less, assuming that the titanium of the barium titanate is 100 mol%.
  4. 4. The laminated ceramic electronic component according to any one of claims 1 to 3, wherein: in the at least a part of the region, the concentration of aluminum is 10.0mol% or less, assuming that the titanium of the barium titanate is 100 mol%.
  5. 5. The laminated ceramic electronic component according to any one of claims 1 to 4, wherein: the at least a portion of the region contains dielectric particles, and silicon and aluminum are present as amorphous or needle-like segregants at grain boundaries and grain boundary triple points of the dielectric particles.
  6. 6. The laminated ceramic electronic component according to any one of claims 1 to 5, wherein: the aluminum concentration is different between the cover layer and the side edge, and the aluminum concentration of the side edge is larger than that of the cover layer.
  7. 7. The laminated ceramic electronic component according to any one of claims 1 to 6, wherein: the average particle diameter of the dielectric particles contained in the cover layer or the side edge is 2 times larger than the average particle diameter of the dielectric particles contained in the dielectric layer.

Description

Laminated ceramic electronic component Technical Field The present invention relates to a laminated ceramic electronic component. Background In a high-frequency communication system represented by a mobile phone, a laminated ceramic electronic component such as a laminated ceramic capacitor (MLCC) is used to remove noise (for example, refer to patent documents 1 to 5). Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2018-182128 Patent document 2 Japanese patent application laid-open No. 2020-113575 Patent document 3 Japanese patent application laid-open No. 2009-16796 Patent document 4 Japanese patent application laid-open No. 2020-202402 Patent document 5 Japanese patent application laid-open No. 2024-43312 Disclosure of Invention Technical problem to be solved by the invention In the laminated ceramic electronic component, there is a possibility that a difference in the firing state occurs between the dielectric layer surrounding the capacitor portion and the outer peripheral portion of the capacitor portion, and the moisture resistance is lowered. On the other hand, when the moisture resistance is to be improved, there is a possibility that the electric characteristics of the capacitor portion are adversely affected. The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a laminated ceramic electronic component capable of improving moisture resistance while suppressing adverse effects on electrical characteristics of a capacitor portion. Means for solving the technical problems A laminated ceramic electronic component includes a dielectric layer, an internal electrode layer facing each other through the dielectric layer, a cover layer provided in a first direction outside the outermost internal electrode layer, wherein the first direction is a lamination direction of the dielectric layer and the internal electrode layer, a side edge adjacent to the dielectric layer and the internal electrode layer in a second direction orthogonal to the first direction, and an external electrode provided adjacent to the internal electrode layer in a third direction orthogonal to the first direction and the second direction, and electrically connected to the internal electrode layer, wherein at least a part of an outer peripheral portion composed of the cover layer and the side edge contains barium titanate as a main component, and wherein the at least a part of the area contains 0.1mol% or more of boron, 1.0mol% or more of silicon, 1.0mol% or more of aluminum, and less than 0.1mol% of magnesium, and the concentration of aluminum is less than 0.1mol% of aluminum, and the concentration of aluminum is less than 0.1mol% of the dielectric layer is 100mol% of barium titanate. In the at least a part of the region of the laminated ceramic electronic component, the concentration of aluminum may be 10.0mol% or less, assuming that the titanium of the barium titanate is 100 mol%. In the at least a part of the region of the laminated ceramic electronic component, the concentration of silicon may be 3.0mol% or less, assuming that the titanium of the barium titanate is 100 mol%. In the at least a part of the region of the laminated ceramic electronic component, the boron concentration may be 2.5mol% or less, assuming that the titanium of the barium titanate is 100 mol%. In the above laminated ceramic electronic component, the at least a part of the region may contain dielectric particles, and silicon and aluminum may be present as an amorphous phase or needle-like segregation in a grain boundary and a grain boundary triple point of the dielectric particles. In the above laminated ceramic electronic component, the aluminum concentration may be different between the cover layer and the side edge, and the aluminum concentration of the side edge may be larger than the aluminum concentration of the cover layer. In the above laminated ceramic electronic component, the average particle diameter of the dielectric particles contained in the cover layer or the side edge may be 2 times larger than the average particle diameter of the dielectric particles contained in the dielectric layer. Effects of the invention The present invention can provide a laminated ceramic electronic component which can suppress adverse effects on the electrical characteristics of a capacitor portion and can improve moisture resistance. Drawings Fig. 1 is a partial cross-sectional perspective view of a laminated ceramic capacitor. Fig. 2 is a sectional view taken along line A-A of fig. 1. Fig. 3 is a sectional view taken along line B-B of fig. 1. Fig. 4 (a) and (b) are enlarged views of the vicinity of the external electrode. Fig. 5 (a) to (d) are diagrams for explaining the outer peripheral portion. Fig. 6 is a reflected electron image obtained by photographing a part of a cross section of an outer peripheral portion containing barium titanate a