Dielectric Ceramic Composition for Thin Multilayer Capacitors
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Solution Overview
Problem
Existing multilayer ceramic capacitors face challenges in achieving improved properties when the dielectric layer is made thinner, as the thickness reduction leads to compromised specific permittivity, temperature characteristics, and high-temperature accelerated lifetime.
Innovation Solution
A dielectric ceramic composition with a perovskite-type crystal structure, including specific ratios of rare earth oxides and other components like Mg and Si, is used to create a dielectric layer with enhanced characteristics, even at thinner thicknesses, by controlling the solute rare earth elements and optimizing the content ratios of RA, RB, and RC oxides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the dielectric layer is made thinner to reduce component size, then the compact size is improved, but the specific permittivity and high-temperature accelerated lifetime deteriorate
Solution Approach 1:
The invention changes the chemical composition parameters of the dielectric layer by incorporating specific rare earth elements (Dy, Gd, Tb, Ho, Y, Yb, Lu) in controlled amounts. This compositional parameter change enables the dielectric layer to maintain high specific permittivity and reliability even at reduced thickness, resolving the contradiction between compact size and high-temperature accelerated lifetime
Solution Approach 2:
The invention uses a composite dielectric material system combining barium titanate main component with multiple rare earth oxide additives. This composite structure allows the thin dielectric layer to achieve both compact size and improved high-temperature accelerated lifetime through synergistic effects of different components
2Volume of moving object
If the dielectric layer is made thinner to reduce component size, then the compact size is improved, but the specific permittivity deteriorates
Solution Approach 1:
The invention modifies the compositional parameters by adding rare earth elements (RA: Dy, Gd, Tb; RB: Ho, Y; RC: Yb, Lu) with specific content ratios. These parameter changes enhance the specific permittivity of the thin dielectric layer, allowing compact size reduction without sacrificing dielectric performance
Solution Approach 2:
The invention applies local quality enhancement by concentrating rare earth elements at specific positions within the dielectric layer structure. This localized compositional optimization ensures high specific permittivity is achieved in the thin layer region, resolving the contradiction between compact size and specific permittivity
3Volume of moving object
If the dielectric layer is made thinner to reduce component size, then the compact size is improved, but the temperature characteristics deteriorate
Solution Approach 1:
The invention changes the chemical composition parameters by incorporating rare earth elements with specific thermal properties. These parameter modifications enable the thin dielectric layer to maintain stable temperature characteristics across operating conditions, resolving the contradiction between compact size and temperature characteristics
Data Source
AI summary
A dielectric ceramic composition includes a compound having perovskite type crystal structure shown by a general formula ABO3, where A is at least one selected from Ba, Ca and Sr, and B is at least one selected from Ti and Zr. The dielectric ceramic composition includes, as subcomponents, an oxide of RA (Dy, Gd and Tb); an oxide of RB (Ho and Y); an oxide of RC (Yb and Lu); Mg oxide and an oxide including Si in terms of RA2O3, RB2O3, RC2O3, Mg and Si, respectively. Also, when contents of the oxide of RA, RB and RC with respect to 100 moles of the compound are defined as “α”, “β” and “γ”, respectively, they satisfy relations of 1.2≦(α/β)≦5.0 and 0.5≦(β/γ)≦10.0.