Dielectric Ceramic Composition for Thin MLCC Insulation Reliability
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Solution Overview
Problem
Existing multilayer ceramic capacitors face challenges in achieving miniaturization and increased capacity while ensuring reliability, particularly in managing quality and yield due to degradation of insulation resistance in thin dielectric layers.
Innovation Solution
A dielectric ceramic composition incorporating barium titanate (BaTiO3) with dysprosium (Dy) and praseodymium (Pr) as accessory ingredients, with specific content ratios to enhance domain wall mobility and improve insulation resistance, is used to form dielectric layers with thicknesses of 0.4 μm or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the thickness of internal dielectric layers is reduced to miniaturize the multilayer ceramic capacitor, then the capacity increases, but the insulation resistance of the dielectric material degrades
Solution Approach 1:
The patent changes the chemical composition parameters of the dielectric material by incorporating specific accessory ingredients (dysprosium 0.01-1.0 wt%, praseodymium 0.01-1.0 wt%, and other rare earth elements) into the barium titanate-based base material. This compositional parameter change 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.
Solution Approach 2:
The patent creates a composite dielectric material system by combining barium titanate base material with multiple accessory ingredients including dysprosium, praseodymium, and other rare earth elements. This composite material structure enhances the overall performance of the dielectric layer, maintaining both the high-k dielectric constant and insulation resistance required for reliable miniaturized capacitors.
2Productivity
If the thickness of internal dielectric layers is reduced to increase capacity, then more layers can be laminated, but quality management and yield control become more difficult
Solution Approach 1:
The patent optimizes the chemical composition parameters of the dielectric material to improve sintering characteristics and reduce manufacturing variability. By carefully controlling the content of accessory ingredients (dysprosium 0.01-1.0 wt%, praseodymium 0.01-1.0 wt%, and other rare earth elements totaling 0.01-5.0 wt%), the material achieves consistent performance that simplifies quality management and improves yield even when producing large numbers of thin layers.
3Volume of moving object
If the thickness of internal dielectric layers is reduced to miniaturize the capacitor, then the device becomes smaller, but the reliability of the dielectric structure deteriorates
Solution Approach 1:
The patent develops a composite dielectric material comprising barium titanate base material combined with multiple accessory ingredients including dysprosium (0.01-1.0 wt%), praseodymium (0.01-1.0 wt%), and other rare earth elements (0.01-5.0 wt%). This composite structure provides both the high-k dielectric constant needed for high capacity and the structural stability required for reliability in miniaturized devices with layer thicknesses of 0.6 μm or less.
Solution Approach 2:
The patent applies local quality enhancement by incorporating specific rare earth elements at controlled concentrations within the dielectric material matrix. The dysprosium and praseodymium are distributed at 0.01-1.0 wt% each, while other rare earth elements are added at 0.01-5.0 wt%, creating localized compositional variations that enhance the overall reliability of the thin dielectric structure without compromising the miniaturization goals.
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 solution ensures high-k dielectric constant and improved reliability, including enhanced insulation resistance, even in ultra-small high-capacitance multilayer ceramic capacitors.
Implementation Method 1
A dielectric ceramic composition incorporating barium titanate (BaTiO3) with dysprosium (Dy) and praseodymium (Pr) as accessory ingredients, with specific content ratios to enhance domain wall mobility and improve insulation resistance
Data Source
AI summary
A dielectric ceramic composition includes a barium titanate (BaTiO3)-based base material main ingredient and an accessory ingredient, the accessory ingredient including dysprosium (Dy) and praseodymium (Pr) as first accessory ingredients. A content of the Pr satisfies 0.233 mol≤Pr≤0.699 mol, based on 100 mol of the barium titanate base material main ingredient.