MLCC Dielectric Composition for Uniform Grain Size and Capacitance
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Solution Overview
Problem
As multilayer ceramic capacitors (MLCCs) become more compact and highly integrated, the uniformity of the microstructure in the active region becomes crucial to maintain consistent capacitance characteristics, as variations in dielectric grain sizes across the active region lead to increased capacitance deviations.
Innovation Solution
Incorporating cerium (Ce) and dysprosium (Dy) in specific molar ratios within the dielectric layer of MLCCs, with a Ce/Dy molar ratio of 1 to 10, ensures a uniform microstructure by minimizing dielectric grain size deviations across the active region, thereby reducing capacitance variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the active region ratio is increased to achieve higher capacitance, then the capacitance value improves, but the microstructure uniformity deteriorates leading to increased capacitance distribution
Solution Approach 1:
The patent applies local quality by introducing different rare earth elements (cerium and dysprosium) at specific locations within the dielectric layer. The cerium is concentrated in the active region while dysprosium is present in the cover region, creating location-specific microstructure characteristics that optimize both capacitance and uniformity
Solution Approach 2:
The patent changes the chemical composition parameters of the dielectric layer by incorporating rare earth elements with specific atomic ratios. By adjusting the Ce/Dy atomic ratio and the presence of other rare earth elements, the microstructure uniformity is controlled while maintaining high capacitance in the active region
2Quantity of substance
If the dielectric grain size is increased to improve capacitance, then the capacitance value improves, but the capacitance distribution increases due to non-uniform grain growth
Solution Approach 1:
The patent creates different local environments for dielectric grain growth by introducing cerium in the active region and dysprosium in the cover region. This local compositional variation ensures uniform grain size distribution within the active region while maintaining overall capacitance
Solution Approach 2:
The rare earth elements act as intermediaries that control dielectric grain growth behavior. Cerium promotes uniform grain growth in the active region, while dysprosium suppresses excessive grain growth at the cover region, thereby reducing capacitance distribution
Data Source
AI summary
A multilayer ceramic capacitor including a capacitor body including a dielectric layer and an internal electrode layer, and an external electrode disposed on an outer surface of the capacitor body, wherein the dielectric layer includes a barium titanate-based main component and a subcomponent including cerium (Ce) and dysprosium (Dy), and a Ce/Dy molar ratio is about 1 to about 10.