Core-Shell Dielectric Grains for Stable Multilayer Capacitors
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Solution Overview
Problem
Multilayer ceramic capacitors experience significant reduction in dielectric properties when subjected to high voltage due to DC-bias properties, leading to degradation and a need for improved reliability and dielectric performance, especially under high-temperature/high-pressure conditions.
Innovation Solution
A multilayer electronic component with a dielectric layer comprising perovskite-based dielectric grains having a core-shell structure, where the core portion contains elements like Bi, Na, K, Sr, or Ca, and the shell portion includes Ti and a rare earth element, with a controlled content of Zr and a rare earth element, enhancing dielectric properties and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Ba or Ti elements are substituted to prevent DC-bias property degradation, then dielectric property deterioration is prevented, but high dielectric constant is deteriorated
Solution Approach 1:
The patent applies local quality by creating a core-shell structure where the core region and shell region have different compositional characteristics. The core contains higher concentrations of certain elements while the shell has different compositions, allowing each region to contribute differently to the overall dielectric properties. This spatial differentiation enables simultaneous optimization of dielectric constant and DC-bias resistance without uniform substitution throughout the material.
Solution Approach 2:
The patent employs composite materials by combining multiple elements (Ba, Ti, Zr, and dopants) in a core-shell structured ceramic composition. The core-shell architecture itself represents a composite structure where inner and outer regions have distinct compositional identities. This composite approach allows the material to exhibit both high dielectric constant from the core and improved DC-bias stability from the shell region.
2Reliability
If element substitution is performed to improve dielectric property stability, then DC-bias property degradation is prevented, but manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the dielectric grain into core and shell regions with distinct compositional characteristics. This segmentation allows independent optimization of each region's composition to achieve desired dielectric properties while managing complexity through a modular design approach where the core and shell can be formulated separately.
Solution Approach 2:
The patent utilizes parameter changes by systematically varying the compositional parameters (element ratios, doping concentrations) in the core and shell regions. By controlling parameters such as the ratio of substituting elements and their distribution between core and shell, the patent optimizes dielectric stability while managing composition complexity through defined parameter ranges and relationships.
Data Source
AI summary
A multilayer electronic component includes a body including a dielectric layer and internal electrodes; and external electrodes disposed on the body, wherein the dielectric layer includes a plurality of dielectric grains having a perovskite-based composition represented by ABO3, the A includes a first element including at least one of Bi, Na, K, Sr, and Ca, and the B includes a second element including Ti, wherein at least one of the plurality of dielectric grains has a core-shell structure, and a content of the first element included in the core portion is twice or more than a content of the first element included in the shell portion, and wherein the core portion includes a first core portion on an internal side and a second core portion covering at least a portion of the first core portion, and the second core portion includes Zr.