BaTiO3 Dielectric Ceramic Composition for Thin MLCC Layers
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in achieving high specific permittivity and reliable performance, particularly when dielectric layers are made thinner, due to limitations in existing dielectric ceramic compositions which compromise capacitance, temperature stability, and reliability under high electric fields and varying temperatures.
Innovation Solution
A dielectric ceramic composition comprising BaTiO3 as the main component, with specific ratios of MgO, MnO, rare earth oxides, BaZrO3, and transition metal oxides, along with sintering aids, is used to create dielectric layers with high specific permittivity, improved temperature characteristics, and enhanced reliability, even when the thickness is reduced to 0.5 to 2.0 μm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dielectric layers are made thinner to achieve downsizing and higher capacitance, then capacitance increases and device size decreases, but reliability deteriorates and specific permittivity becomes difficult to maintain
Solution Approach 1:
The patent applies parameter changes by precisely controlling the composition ratios of multiple oxide components (BaTiO3, MgO, MnO, rare earth oxides, BaZrO3, transition metal oxides) within specific ranges. This compositional parameter optimization enables thin dielectric layers (0.5 to 2.0 μm) to maintain high specific permittivity (3500 or higher) and reliability simultaneously, resolving the contradiction between downsizing and reliability maintenance.
Solution Approach 2:
The patent uses composite materials by combining multiple oxide components with complementary functions: BaTiO3 provides high permittivity, MgO and MnO control grain growth and stability, rare earth oxides enhance temperature characteristics, BaZrO3 improves dielectric properties, and transition metal oxides refine microstructure. This multi-component composite system enables thin layers to achieve both high capacitance and reliability.
2Productivity
If dielectric layers are made thinner to increase the number of laminated layers, then capacitance increases, but it becomes difficult to secure reliability and maintain high specific permittivity
Solution Approach 1:
The patent applies parameter changes by optimizing the chemical composition parameters of the dielectric ceramic within specific ranges. This enables consistent formation of high-quality thin dielectric layers with high specific permittivity, allowing increased layer count while maintaining reliability through controlled material properties rather than relying on thicker individual layers.
Solution Approach 2:
The patent applies local quality by ensuring uniform distribution and specific concentration ranges of multiple oxide components within the dielectric layer composition. This local compositional control enables each thin layer to possess optimized properties independently, maintaining high specific permittivity and reliability even when layers are made thinner and stacked in larger numbers.
3Ease of manufacture
If conventional dielectric ceramic composition is used, then manufacturing is simpler, but specific permittivity is low (1500) and temperature characteristics are poor
Solution Approach 1:
The patent uses composite materials by combining multiple oxide components with complementary functions: BaTiO3 provides high permittivity, MgO and MnO control grain growth and stability, rare earth oxides enhance temperature characteristics, BaZrO3 improves dielectric properties, and transition metal oxides refine microstructure. This multi-component composite system enables thin layers to achieve both high capacitance and reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition maintains high specific permittivity (3500 or higher), excellent capacitance-temperature characteristics, and extended insulation resistance lifetime, ensuring reliable performance under severe conditions, including high electric fields and elevated temperatures.
Implementation Method 1
manufactured by firing a green chip obtained by stacking alternately ceramic green sheets comprising pre-determined dielectric ceramic composition and internal electrode layers
Data Source
AI summary
A dielectric ceramic composition of the invention comprises: BaTiO3 as a main component, MgO: 0.50 to 3.0 moles, MnO: 0.05 to 0.5 moles, oxide (RE12O3) of element selected from Sm, Eu, and Gd, oxide (RE22O3) of element selected from Tb and Dy, oxide (RE32O3) of element selected from Y, Ho, Er, Yb, Tm and Lu, BaZrO3: 0.20 to 1.0 moles, and oxide of element selected from V, Ta, Mo, Nb, and W: 0.05 to 0.25 moles as subcomponents wherein each subcomponent is calculated as a conversion of an oxide or composite oxide, with respect to 100 moles of the main component, and contents of said RE12O3, RE22O3 and RE32O3 satisfy RE12O3<RE22O3 and (RE12O3+RE22O3)≦RE32O3.