Dielectric Ceramic Composition for High Voltage MLCCs
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Solution Overview
Problem
Multilayer ceramic capacitors exhibit insufficient properties under high electric field intensities, particularly in terms of specific permittivity and insulation resistance, when used at high rated voltages, leading to decreased effective capacity and reliability.
Innovation Solution
A dielectric ceramic composition with a perovskite type compound (Ba1-x-ySrxCay)m(Ti1-zZrz)O3, incorporating a rare earth element oxide as a subcomponent, where Zr and the rare earth element form a complete solid solution, maintaining specific permittivity and improving insulation resistance and high-temperature accelerated lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the electric field intensity increases to achieve high rated voltage operation, then the voltage handling capability is improved, but the specific permittivity and insulation resistance decrease
Solution Approach 1:
The patent applies local quality by creating a core-shell structure where the shell region has a different composition (higher subcomponent concentration) than the core. This localized compositional variation allows the particle boundary region to have enhanced properties that specifically address the deterioration of insulation resistance and specific permittivity under high electric field conditions, while maintaining overall voltage handling capability.
Solution Approach 2:
The patent uses composite materials by combining the main perovskite component with subcomponents in a core-shell structure. The shell region contains a higher concentration of subcomponents (such as rare earth elements or other dopants) compared to the core, creating a composite particle structure that maintains stability and prevents property deterioration under high electric field intensity.
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 ceramic composition maintains good specific permittivity and insulation resistance while enhancing high-temperature accelerated lifetime, even under high electric field intensities, resulting in improved reliability and performance of multilayer ceramic capacitors.
Implementation Method 1
the dielectric particles include a complete solid solution particle in which Zr and the rare earth element are solid dissolved to the entire dielectric particle
Data Source
AI summary
A dielectric ceramic composition having good properties, particularly good IR property and high temperature accelerated lifetime, even under high electric field intensity. A dielectric ceramic composition having a main component made of a perovskite type compound expressed by a compositional formula of (Ba1-x-ySrxCay)m(Ti1-zZrz)O3 (note that, m, x, y, and z of the above compositional formula all represent molar ratios, and each satisfies 0.9<m<1.1, 0<x<0.5, 0<y<0.3, 0<(x+y)<0.6, and 0.03<z<0.3), and a first sub component made of an oxide of a rare earth element R (note that, R is at least one selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu), wherein the dielectric ceramic composition includes dielectric particles and a particle boundary.