Dielectric Ceramic Composition for Stable Single-Layer Capacitance
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Solution Overview
Problem
Existing dielectric ceramic compositions do not adequately address voltage and temperature characteristics of capacitance, leading to significant dependence of capacitance on voltage and temperature variations, which can result in large leakage currents and inconsistent performance.
Innovation Solution
A dielectric ceramic composition with main component grains having a perovskite structure (AMO3) and controlled grain sizes (D50 ≤ 960 nm, D90 ≤ 1460 nm) and inclusion of specific subcomponents (Sm, Nd, La, Dy, Ce, Pr, Eu, Y, Gd, Tb, Ho, Er, Tm, Yb) to enhance voltage and temperature characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If conventional dielectric ceramic compositions are used to achieve high permittivity, then the dielectric constant is improved, but the voltage characteristics of capacitance deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the grain size parameters (D50 ≤ 960 nm, D90 ≤ 1460 nm) of the perovskite structure ceramic grains. This grain size optimization resolves the contradiction by achieving a balance point where the capacitance remains stable across voltage ranges while maintaining high permittivity, thus improving voltage characteristics without sacrificing dielectric constant.
Solution Approach 2:
The patent employs composite materials by formulating a multi-component ceramic system with specific ratios of BaTiO3-based perovskite grains combined with controlled amounts of secondary phases. This composite approach enables simultaneous achievement of high permittivity and improved voltage characteristics, as the composite structure allows the main perovskite phase to provide high dielectric constant while the controlled grain size and secondary phases suppress voltage-dependent capacitance variation.
2Stress or pressure
If grain size is increased to improve dielectric properties, then permittivity is improved, but voltage characteristics and temperature characteristics deteriorate
Solution Approach 1:
The patent applies parameter changes by establishing specific grain size ranges (D50 ≤ 960 nm, D90 ≤ 1460 nm) that optimize the balance between permittivity and stability characteristics. This precise parameter control resolves the contradiction by identifying the optimal grain size window where dielectric constant is sufficiently high while voltage and temperature characteristics are improved.
Solution Approach 2:
The patent employs a standardized perovskite structure (AMO3) as a template or copying framework, where A includes Ba and M includes Ti, with consistent crystal structure across different compositions. This structural copying allows systematic optimization of grain size parameters to achieve both high permittivity and good voltage/temperature characteristics simultaneously.
Data Source
AI summary
A dielectric ceramic composition includes main component grains having a perovskite structure represented by a formula AMO3. “A” includes Ba. “M” includes Ti. D50 of the main component grains is 960 nm or less. D90 of the main component grains is 1460 nm or less.