Core-Double Shell Ceramic Capacitors for Thin-Layer Reliability
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Solution Overview
Problem
Current methods for miniaturizing and increasing the capacitance of multilayer ceramic capacitors, such as doping BaTiO3 with impurity elements, often deteriorate dielectric properties and are ineffective at high voltages, making it challenging to achieve both reliability and high dielectric constants.
Innovation Solution
The use of dielectric crystal grains with a core-double shell structure, where the first shell includes elements like Sn, Sb, Ge, Si, Ga, In, or Zr, and the second shell includes Ca or Sr, to enhance grain boundary resistance and dielectric properties, while maintaining a high dielectric constant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the dielectric layer thickness is decreased to achieve miniaturization and capacitance increase, then manufacturing precision is improved, but reliability deteriorates
Solution Approach 1:
The patent applies local quality by concentrating impurity elements specifically in the shell regions surrounding the core, rather than uniformly distributing them throughout the crystal grain. This localized placement ensures that grain boundary resistance is enhanced at the critical grain boundary interfaces while the core region maintains its excellent dielectric properties, effectively resolving the contradiction between grain boundary resistance and dielectric property preservation.
Solution Approach 2:
The patent employs composite materials by creating a multi-phase crystal grain structure with different compositional regions (core with BaTiO3, first shell with impurity elements, second shell with Ca or Sr). This composite structure combines the advantages of each region - the core provides high dielectric constant while the shells provide grain boundary resistance - enabling thin dielectric layers to maintain both reliability and capacitance performance.
Data Source
AI summary
A ceramic electronic component includes: a body including dielectric layers and internal electrodes; and external electrodes disposed on the body and connected to the internal electrodes, wherein the dielectric layer includes a plurality of dielectric crystal grains, and at least one of the plurality of dielectric crystal grains has a core-double shell structure, the double shell includes a first shell surrounding at least a portion of the core and a second shell surrounding at least a portion of the first shell, the first shell includes a first element, one or more of Sn, Sb, Ge, Si, Ga, In, or Zr, and the second shell includes a second element, one or more of Ca or Sr.