Dielectric Ceramic Composition for Multilayer Capacitors
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in achieving sufficient reliability and favorable temperature characteristics as dielectric layers become thinner and more multilayered, requiring improved dielectric ceramic compositions to maintain performance under increased electric field intensity.
Innovation Solution
A dielectric ceramic composition with a perovskite type crystal structure, incorporating a rare earth compound and segregation particles with a core-shell structure, optimized in terms of particle size and concentration, and excluding Mg to enhance specific permittivity, temperature characteristics, and high-temperature accelerated lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dielectric layers are made thinner to achieve downsizing and higher capacity, then the capacitance and integration density are improved, but the reliability and temperature characteristics deteriorate due to increased electric field intensity
Solution Approach 1:
The patent applies local quality by creating core-shell structured dielectric particles where the shell region has different compositional characteristics than the core. The shell contains a specific concentration of rare earth elements (0.01-0.5 wt%) that differs from the core, providing localized electrical property optimization at the particle surface where electric field effects are most pronounced. This local compositional variation allows the thin dielectric layer to maintain high reliability while achieving the required thinness for high capacitance density.
Solution Approach 2:
The patent employs composite materials by combining multiple elements (Ba, Ti, rare earth elements, and other additives) in a specific composite structure. The dielectric composition includes Ba1-x-yCaxSryTi1-zZrzO3 as the base compound with controlled additions of rare earth oxides (0.01-0.5 wt%), MgO (0.1-1.0 wt%), and SiO2 (0.1-1.0 wt%). This composite approach creates a material with optimized electrical properties that simultaneously achieves thin layer compatibility and high reliability.
2Volume of moving object
If dielectric layers are made thinner to achieve downsizing, then the device size is reduced, but the temperature characteristics worsen due to increased electric field intensity
Solution Approach 1:
The patent applies local quality by creating core-shell structured dielectric particles where the shell region has different compositional characteristics than the core. The shell contains a specific concentration of rare earth elements (0.01-0.5 wt%) that differs from the core, providing localized electrical property optimization at the particle surface where electric field effects are most pronounced. This local compositional variation allows the thin dielectric layer to maintain high reliability while achieving the required thinness for high capacitance density.
Solution Approach 2:
The patent employs parameter changes by precisely controlling the composition parameters of the dielectric material. The formula Ba1-x-yCaxSryTi1-zZrzO3 with controlled additions of rare earth oxides (0.01-0.5 wt%), MgO (0.1-1.0 wt%), and SiO2 (0.1-1.0 wt%) creates a material system where compositional parameters can be adjusted to optimize temperature characteristics. This parameter control enables the dielectric layer to maintain stable electrical properties across temperature variations even when made thinner.
3Quantity of substance
If the number of dielectric layers is increased to achieve higher capacity, then the capacitance is improved, but the reliability deteriorates due to increased electric field intensity in each layer
Solution Approach 1:
The patent applies local quality by creating core-shell structured dielectric particles where the shell region has different compositional characteristics than the core. The shell contains a specific concentration of rare earth elements (0.01-0.5 wt%) that differs from the core, providing localized electrical property optimization at the particle surface where electric field effects are most pronounced. This local compositional variation allows the thin dielectric layer to maintain high reliability while achieving the required thinness for high capacitance density.
Solution Approach 2:
The patent employs composite materials by combining multiple elements (Ba, Ti, rare earth elements, and other additives) in a specific composite structure. The dielectric composition includes Ba1-x-yCaxSryTi1-zZrzO3 as the base compound with controlled additions of rare earth oxides (0.01-0.5 wt%), MgO (0.1-1.0 wt%), and SiO2 (0.1-1.0 wt%). This composite approach creates a material with optimized electrical properties that simultaneously achieves thin layer compatibility and high reliability.
Data Source
AI summary
A dielectric ceramic composition includes at least dielectric particles having a core-shell structure and segregation particles, a concentration of a rare earth compound in the segregation particle is twice or more than an average concentration of the rare earth compound in a shell part of the dielectric particle having the core-shell structure, an area occupied by the segregation particles is 0.1 to 1.1%, when a maximum particle size of the segregation particle is defined as rbmax, a minimum particle size of the segregation particle is defined as rbmin, and an average particle size of the dielectric particle having the core-shell structure is defined as ra, a relation of rbmax/ra≦2.00 and rbmin/ra≧0.25 is satisfied, and the segregation particles substantially do not include Mg.