Monolithic Ceramic Capacitor Dielectric Composition for High Capacitance
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Solution Overview
Problem
Monolithic ceramic capacitors with high relative dielectric constants above 4,500 struggle to maintain good temperature characteristics and reliability, as increasing the dielectric constant beyond a certain point compromises temperature stability and reliability.
Innovation Solution
A monolithic ceramic capacitor design incorporating a multilayer body with perovskite compounds containing Ba and Ti, along with elements like Gd, Tb, Dy, Y, Si, Mn, Mg, and Zr, where specific mole ratios and content ranges are maintained to achieve a high relative dielectric constant while ensuring good temperature characteristics and high reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the relative dielectric constant is increased above 4,500 to achieve higher capacity, then the capacitance increases, but temperature characteristics deteriorate and reliability becomes unsatisfactory
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molar ratios of multiple components in the dielectric composition. Specifically, it adjusts the content of Gd2O3 (0.03-0.10 mol), BaZrO3 (0.20-0.70 mol), and other secondary components relative to 100 mol of BaTiO3 primary component. This systematic parameter optimization enables achieving relative dielectric constant above 4,500 while maintaining temperature characteristics within ±15% in the range of -25°C to 85°C, thus resolving the contradiction between high capacitance and reliability.
Solution Approach 2:
The patent employs composite materials by combining BaTiO3 primary component with multiple secondary components including Gd2O3, MnO, R2O3 (rare earth elements other than Gd), BaZrO3, and other oxides. This multi-component composite dielectric system synergistically achieves both high relative dielectric constant (>4,500) and good temperature characteristics, overcoming the limitation of single-component or simple composite systems that could only achieve ≤4,500 dielectric constant.
2Quantity of substance
If the relative dielectric constant is increased above 4,500 to achieve higher capacity, then the capacitance increases, but good temperature characteristics (within ±15% in the temperature range of −25° C. to 85° C.) cannot be ensured
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molar ratios of multiple components in the dielectric composition. Specifically, it adjusts the content of Gd2O3 (0.03-0.10 mol), BaZrO3 (0.20-0.70 mol), and other secondary components relative to 100 mol of BaTiO3 primary component. This systematic parameter optimization enables achieving relative dielectric constant above 4,500 while maintaining temperature characteristics within ±15% in the range of -25°C to 85°C, thus resolving the contradiction between high capacitance and reliability.
Solution Approach 2:
The patent employs composite materials by combining BaTiO3 primary component with multiple secondary components including Gd2O3, MnO, R2O3 (rare earth elements other than Gd), BaZrO3, and other oxides. This multi-component composite dielectric system synergistically achieves both high relative dielectric constant (>4,500) and good temperature characteristics, overcoming the limitation of single-component or simple composite systems that could only achieve ≤4,500 dielectric constant.
Data Source
AI summary
A monolithic ceramic capacitor that contains a perovskite compound including Ba and Ti and at least one type of element selected from Gd, Tb, and Dy, and contains elements selected from Y, Si, Mn, Mg, and Zr. The content a of at least one element selected from Gd, Tb, and Dy satisfies 0.2≤a≤0.8, the content b of Y satisfies 0.0≤b≤0.5, the content c of Si satisfies 0.0≤c≤2.5, the content d of Mn satisfies 0.0≤d≤0.25, the content e of Mg satisfies 0.0≤e≤1.2, the content f of Zr satisfies 0.0≤f≤0.5, and the molar ratio m of the content of Ba/(f+the content of Ti) satisfies 0.99≤m≤1.01, where the total content of Ti is 100 parts by mole.