Dielectric Composition with Ca-RE-Si-O Segregation Phases
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Solution Overview
Problem
Existing dielectric ceramics lack sufficient density and strength, which affects the performance of electronic components like multilayer ceramic capacitors.
Innovation Solution
A dielectric composition with main phases and Ca-RE-Si—O segregation phases, where 'A' includes barium or calcium, 'B' includes titanium or zirconium, and 'RE' represents rare earth elements, with specific molar ratios and crystal structure, enhancing density and strength through Ca-RE-Si—O segregation phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coverage layer composed of complex oxide containing alkaline-earth elements, rare earth elements, and Si is formed on the surfaces of main crystal particles, then the dielectric characteristics are improved, but the density and strength are insufficient
Solution Approach 1:
The invention changes the chemical composition parameters by specifying precise molar ratios (Si/Ca > 1, Si/RE > 1, RE/Ca > 1) and elemental content (total of Ca, RE, and Si is 0.9 parts by mol or more). These parameter changes optimize the segregation phase composition to simultaneously improve dielectric characteristics and strength, resolving the contradiction between reliability and strength.
Solution Approach 2:
The invention creates a composite microstructure consisting of main phases (ABO3 where A includes barium or calcium and B includes titanium or zirconium) and Ca-RE-Si-O segregation phases. This composite material structure allows the segregation phases to enhance both dielectric properties and mechanical strength, overcoming the limitation of the coverage layer approach.
2Reliability
If a coverage layer composed of complex oxide containing alkaline-earth elements, rare earth elements, and Si is formed on the surfaces of main crystal particles, then the dielectric characteristics are improved, but the density is insufficient
Solution Approach 1:
The invention optimizes the composition parameters of the segregation phases by setting specific molar ratios and total content (0.9 parts by mol or more of Ca, RE, and Si). These parameter changes enable the segregation phases to contribute to both dielectric performance and density enhancement, resolving the contradiction between reliability and density.
Solution Approach 2:
The composite microstructure of main phases and Ca-RE-Si-O segregation phases creates a material system where the segregation phases fill interstitial spaces and enhance packing efficiency. This composite approach simultaneously improves dielectric characteristics and density, overcoming the insufficiency of the coverage layer method.
Data Source
AI summary
A dielectric composition includes main phases and Ca-RE-Si—O segregation phases. The main phases include a main component expressed by ABO3. “A” includes at least one selected from barium and calcium. “B” includes at least one selected from titanium and zirconium. “RE” represents at least one of rare earth elements. A molar ratio of (Si/Ca) is larger than one. A molar ratio of (Si/RE) is larger than one, provided that the molar ratio of (Si/RE) is a molar ratio of silicon included in the segregation phases to the rare earth elements included therein. An average length of major axes of the segregation phases is 1.30-2.80 times as large as an average particle size of the main phases. An average length of minor axes of the segregation phases is 0.21-0.48 times as large as an average particle size of the main phases.