Multilayer Ceramic Capacitor Mo Concentration Gradient
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Solution Overview
Problem
The reduction in size of multilayer ceramic capacitors to accommodate downsized electronic devices leads to a trade-off between the life property of dielectric layers and the continuity modulus of internal electrode layers, where Mo addition improves dielectric layer reliability but can degrade internal electrode continuity, compromising overall capacitor reliability.
Innovation Solution
A multilayer ceramic capacitor design with a Mo concentration in the co-material being smaller than in the ceramic grain, and a manufacturing method involving the formation of a green sheet with ceramic particles and Mo compounds, where the Mo concentration in the green sheet is higher than in the conductive paste for internal electrodes, ensuring improved dielectric layer life property and high continuity modulus of internal electrode layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Mo is added to dielectric layers to improve life property and reliability, then dielectric layer reliability is improved, but internal electrode layer continuity modulus degrades
Solution Approach 1:
The patent applies local quality by creating different Mo concentration zones: the dielectric layer contains higher Mo concentration (0.01-5 at%) to improve reliability, while the internal electrode layer contains lower Mo concentration (0-0.1 at%) to maintain continuity modulus. This spatial differentiation of Mo distribution allows each layer to optimize its properties locally without compromising the other.
Solution Approach 2:
The patent segments the Mo distribution across different layers of the multilayer ceramic capacitor. By separating the Mo addition strategy for dielectric layers versus internal electrode layers, the invention resolves the contradiction by allowing Mo to benefit the dielectric layer while preventing its harmful accumulation in the internal electrode layer.
2Duration of action of moving object
If Mo concentration in co-material is increased to improve dielectric layer life property, then dielectric layer life property is improved, but internal electrode layer continuity modulus is reduced
Solution Approach 1:
The patent implements local quality control by specifying that Mo concentration in the co-material (0-0.1 at%) be lower than in the ceramic grain (0.01-5 at%). This localized concentration gradient ensures that the dielectric layer receives sufficient Mo for long-term stability while the internal electrode layer maintains its structural integrity.
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 co-material are alternately stacked, wherein a Mo concentration in the co-material is smaller than that in a ceramic grain in the ceramic dielectric layer.