BaTiO3 Dielectric Composition for Miniaturized Capacitor Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The miniaturization of multilayer ceramic capacitors has led to decreased reliability, insulation resistance, and breakdown voltage due to the thinning of dielectric layers, necessitating a composition and structure that enhances these properties while maintaining capacitance and temperature stability.
Innovation Solution
A dielectric composition based on BaTiO3 with dysprosium (Dy) and terbium (Tb) as accessory components, where the sum of Dy and Tb is between 1.5 and 2.0 mol and the Tb/Dy ratio is between 0.1 and 0.15, improving insulation resistance and temperature stability, specifically satisfying X5R temperature characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the thickness of the dielectric layer is decreased to achieve miniaturization, then the size of the multilayer ceramic capacitor is reduced, but the reliability, insulation resistance, and breakdown voltage are decreased
Solution Approach 1:
The patent changes the chemical composition parameters of the dielectric layer by introducing specific accessory components (rare earth elements like Dy, Tb, Ho, Er, Tm, Yb, and Bi) with controlled content ratios. This composition optimization allows the dielectric layer to maintain high reliability and insulation resistance even at reduced thicknesses of 0.6 μm or less, thereby resolving the contradiction between miniaturization and reliability preservation
Solution Approach 2:
The patent creates a composite dielectric material system combining BaTiO3-based main component with multiple accessory components (rare earth elements and Bi). This composite structure enhances the dielectric properties and reliability of the thin dielectric layer, enabling miniaturization while maintaining required performance levels for insulation resistance and breakdown voltage
2Quantity of substance
If the thickness of the dielectric layer is decreased to increase capacitance, then the capacitance of the multilayer ceramic capacitor is increased, but the insulation resistance and breakdown voltage are decreased
Solution Approach 1:
The patent optimizes the chemical composition parameters by controlling the content of accessory components (rare earth elements and Bi) within specific ranges (0.01-5.0 mol% each, with Bi at 0.1-2.0 mol%). This parameter optimization enables the dielectric layer to achieve high capacitance at reduced thickness while maintaining insulation resistance and breakdown voltage above required thresholds
Solution Approach 2:
The patent applies local quality enhancement by introducing specific rare earth elements and Bi at controlled concentrations to locally improve the dielectric properties of the thin dielectric layer. This targeted compositional modification enhances insulation resistance and breakdown voltage in the critical regions of the miniaturized capacitor structure
Data Source
AI summary
A dielectric composition includes: a BaTiO3-based main component and a first accessory component, wherein the first accessory component includes dysprosium (Dy) and terbium (Tb), the sum (Dy+Tb) of contents of dysprosium (Dy) and terbium (Tb) is more than 1.5 mol and 2.0 mol or less based on 100 mol of Ti of the main component, and 0.1≤Tb/Dy<0.15 in which Tb/Dy is a ratio of the content of terbium (Tb) to the content of dysprosium (Dy).