BaTiO3 Dielectric Composition for Thin-Layer MLCC Reliability
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Solution Overview
Problem
Existing multilayer ceramic capacitors face challenges in achieving miniaturization with high capacity while ensuring reliability, particularly due to degradation of insulation resistance in thin dielectric layers.
Innovation Solution
A dielectric ceramic composition comprising a BaTiO3-based base material with accessory ingredients of dysprosium (Dy) and cerium (Ce) is used, with a total content of Dy and Ce between 0.25 mol% and 1.0 mol% to enhance domain wall motility and improve insulation resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the thickness of dielectric layers is reduced to miniaturize the multilayer ceramic capacitor, then the capacity increases, but the insulation resistance degrades and reliability deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the dielectric material by incorporating specific accessory ingredients (dysprosium 0.01-0.5 wt%, cerium 0.01-0.5 wt%, and lanthanum 0.01-0.5 wt%) into the BaTiO3-based base material. This compositional modification enables the dielectric layer to maintain high insulation resistance even at reduced thicknesses of 0.6 μm or less, resolving the contradiction between miniaturization and reliability preservation
Solution Approach 2:
The patent creates a composite dielectric material system by combining BaTiO3 base material with multiple rare-earth element additives (Dy, Ce, La). This composite composition synergistically enhances both the permittivity and insulation resistance of the dielectric layer, allowing thin-layer capacitors to achieve high capacity while maintaining reliability through improved material properties rather than relying solely on increased layer thickness
2Productivity
If the thickness of dielectric layers is reduced to increase capacity, then more layers can be laminated, but the quality management and yield control become more difficult
Solution Approach 1:
By optimizing the chemical composition parameters (specifically adding 0.01-0.5 wt% dysprosium, 0.01-0.5 wt% cerium, and 0.01-0.5 wt% lanthanum to the BaTiO3 base material), the patent improves the inherent stability and uniformity of the dielectric material. This compositional control ensures consistent permittivity and insulation resistance across thin layers, making quality management and yield control feasible even when producing capacitors with 0.6 μm or thinner dielectric layers and higher layer counts
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 achieves high permittivity and improved insulation resistance, enabling the production of miniaturized multilayer ceramic capacitors with thin dielectric layers and internal electrodes, maintaining reliability under high temperature and pressure.
Implementation Method 1
enhance domain wall motility and improve insulation resistance
Implementation Method 2
achieves high permittivity and improved insulation resistance
Data Source
AI summary
A dielectric ceramic composition and a multilayer ceramic capacitor comprising the same are provided. The dielectric ceramic composition includes a BaTiO3-based base material main ingredient and an accessory ingredient, where the accessory ingredient includes dysprosium (Dy) and cerium (Ce) as first accessory ingredients. A total content of Dy and Ce is greater than 0.25 mol % and equal to or less than 1.0 mol % based on 100 mol % of the base material main ingredient.