Dielectric Composition Core-Shell Structure High DC Bias
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Solution Overview
Problem
Laminated ceramic capacitors with a core-shell structure experience a decrease in dielectric constant and DC bias resistivity when a DC bias of 5 kV/mm or greater is applied due to uneven DC bias application, as the majority of the BaTiO3 component in the dielectric ceramic layer is not adequately supported by auxiliary components.
Innovation Solution
A dielectric composition with a perovskite crystal structure containing Bi, Na, Sr, and Ti, along with specific particles having a core-shell structure including SrTiO3, where the ratio of specific particles is less than 0.20, and the content of auxiliary components like La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Yb, Ba, Ca, Mg, and Zn is between 0.5 and 15 molar parts, enhancing the dielectric constant and DC bias characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a core-shell structure with auxiliary component diffusion is used, then temperature characteristics of dielectric constant are improved, but DC bias resistivity decreases when DC bias of 5 kV/mm or greater is applied
Solution Approach 1:
The patent applies local quality by creating distinct regions within the dielectric layer: a first region containing auxiliary component diffusion (core-shell structure) for temperature stability, and a second region with high BaTiO3 content for high voltage resistance. This spatial differentiation allows each region to optimize its function without compromising the other.
Solution Approach 2:
The patent uses composite materials by combining BaTiO3 with auxiliary components (such as Sr, Ca, Mg, Mn, Ni) in specific ratios and distributions. The dielectric layer comprises a mixture of BaTiO3 particles and auxiliary components, where the composition and distribution of these materials are controlled to achieve both temperature stability and high DC bias resistivity.
2Quantity of substance
If BaTiO3 occupies the majority of the core portion, then dielectric constant is high, but DC bias is unevenly applied and dielectric constant decreases under high DC bias
Solution Approach 1:
The patent divides the dielectric layer into regions with different compositions: a first region with auxiliary component diffusion for temperature stability and a second region with high BaTiO3 content (80-100 wt%) for high voltage resistance. This local differentiation ensures that the high BaTiO3 content region can withstand high DC bias without excessive carrier generation.
Solution Approach 2:
The patent changes the compositional parameters of the dielectric layer by controlling the weight ratio of BaTiO3 to auxiliary components in different regions. The second region specifically has BaTiO3 content of 80-100 wt%, which is a parameter optimization to reduce carrier generation under high DC bias while maintaining overall dielectric performance.
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 dielectric composition maintains a high dielectric constant and DC bias resistivity even under high DC bias, with a dielectric constant of 1000 or greater, DC bias characteristics between −5% and 15%, and DC bias resistivity of 1013 Ωcm or greater, suitable for high-voltage applications.
Implementation Method 1
A dielectric composition with a perovskite crystal structure containing Bi, Na, Sr, and Ti
Implementation Method 2
maintains a high dielectric constant and DC bias resistivity even under high DC bias, with a dielectric constant of 1000 or greater
Data Source
AI summary
A dielectric composition, a dielectric element, an electronic component and a laminated electronic component are disclosed. In an embodiment the dielectric composition has a perovskite crystal structure containing at least Bi, Na, Sr and Ti, wherein the dielectric composition includes at least one selected from among La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Yb, Ba, Ca, Mg and Zn, wherein the dielectric composition includes specific particles having a core-shell structure that has at least one core portion including SrTiO3, and wherein α<0.20, where α is the ratio of the number of specific particles with respect to the total number of particles contained in the dielectric composition.