BaTiO3 Dielectric Composition for Thin-Layer MLCC Insulation
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Solution Overview
Problem
The challenge is to develop a dielectric ceramic composition that enhances the reliability of multilayer ceramic capacitors, particularly in ensuring high insulation resistance and dielectric constant, while minimizing the thickness of dielectric and electrode layers to accommodate the miniaturization and multifunctionalization of electronic components.
Innovation Solution
A dielectric ceramic composition based on barium titanate (BaTiO3) with dysprosium (Dy) and praseodymium (Pr) as accessory ingredients, where the praseodymium content ranges from 0.233 mol % to 0.699 mol % relative to the barium titanate, is used to improve domain wall mobility and reduce oxygen vacancy defects, thereby achieving high-k dielectric characteristics and improved insulation resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the thickness of dielectric layers is reduced to miniaturize the capacitor, then the capacitance density increases, but the insulation resistance deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the dielectric material by incorporating specific rare-earth elements (dysprosium and praseodymium) in controlled amounts. This compositional parameter change enables the dielectric layer to maintain high insulation resistance even at reduced thickness, resolving the contradiction between miniaturization and reliability.
Solution Approach 2:
The patent creates a composite dielectric material system combining barium titanate base material with rare-earth element additives. This composite approach leverages the high dielectric constant of BaTiO3 while the rare-earth elements provide improved insulation properties, allowing thin layers to achieve both high capacitance density and high reliability.
2Quantity of substance
If the thickness of dielectric layers is reduced to increase capacitance density, then the number of laminated layers increases, but the dielectric performance deteriorates
Solution Approach 1:
The patent modifies the dielectric composition parameters by adding rare-earth elements at specific concentrations (0.01-5 wt% Dy, 0.01-3 wt% Pr). This parameter optimization enables each thin dielectric layer to maintain superior dielectric performance, allowing increased layer count and capacitance density without sacrificing individual layer quality.
Solution Approach 2:
The patent applies local quality enhancement by concentrating rare-earth elements at specific positions within the dielectric layer structure. The additives are incorporated into the dielectric material formulation to locally improve properties at the molecular level, ensuring that even ultrathin layers exhibit high breakdown voltage and low loss characteristics.
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
This composition enables the production of ultra-small, high-capacitance multilayer ceramic capacitors with reliable insulation resistance and dielectric performance, even with thin dielectric layers, by optimizing the content of dysprosium and praseodymium to balance dielectric constant and insulation resistance.
Implementation Method 1
improve domain wall mobility and reduce oxygen vacancy defects, thereby achieving high-k dielectric characteristics
Implementation Method 2
improve domain wall mobility and reduce oxygen vacancy defects, thereby achieving high-k dielectric characteristics and improved 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.