Multilayer Ceramic Capacitor Mg Concentration Gradient
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in achieving high dielectric constants and continuity moduli when reducing ceramic layer thickness and internal electrode size, leading to reduced capacitance and reliability due to size effects and defects in the ceramic layer.
Innovation Solution
A multilayer ceramic capacitor design with a multilayer structure where the Mg concentration in ceramic grains of the dielectric layer is lower than in the internal electrode layer, combined with a manufacturing method that forms green sheets and alternately stacks ceramic particles and conductive paste, ensuring controlled Mg distribution to maintain high dielectric constants and continuity moduli.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the thickness of ceramic layers is reduced to downsize the capacitor, then the chip size is reduced, but the dielectric constant decreases due to size effect
Solution Approach 1:
The patent applies local quality by creating a core-shell structure where the ceramic grain has different Mg concentrations in different regions: the core region (contacting internal electrode) has low Mg concentration to maintain high dielectric constant, while the shell region has high Mg concentration to suppress temperature dependence. This spatial differentiation of composition allows simultaneous achievement of high dielectric constant and temperature stability in miniaturized capacitors.
2Quantity of substance
If the thickness of internal electrode is reduced to increase the number of multilayer, then the capacitance is enlarged, but the continuity modulus decreases
Solution Approach 1:
The patent applies local quality by controlling Mg distribution in the internal electrode material: the core region has high Mg concentration to ensure high continuity modulus and prevent defects, while the shell region has lower Mg concentration. This allows the internal electrode to maintain structural integrity even when thickness is reduced to increase the number of layers.
3Stability of the object's composition
If Mg is doped to smooth capacitance temperature property, then temperature stability is improved, but the dielectric constant at room temperature is reduced
Solution Approach 1:
The patent applies segmentation by dividing the ceramic grain into core and shell regions with different Mg concentrations. The core region (low Mg) provides high dielectric constant for room temperature operation, while the shell region (high Mg) provides temperature stability. This segmentation allows both functions to operate simultaneously without compromising either performance.
Data Source
AI summary
A multilayer ceramic capacitor includes: a multilayer structure in which each of a plurality of ceramic dielectric layers and each of a plurality of internal electrode layers including a ceramic co-material are alternately stacked, wherein a concentration of Mg in a ceramic grain that is included in the ceramic dielectric layer and contacts to the internal electrode layer is smaller than that in the co-material.