Dielectric Ceramic Composition for Thin Multilayer Capacitors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing multilayer ceramic capacitors face challenges in maintaining performance when the dielectric layer is made thinner, as the properties such as specific permittivity, insulation resistance, and high-temperature reliability are compromised.
Innovation Solution
A dielectric ceramic composition with a perovskite-type crystal structure, including specific ratios of rare earth oxides and other metal oxides, is used to create a dielectric layer that maintains performance even at reduced thickness, by controlling the solute rare earth elements and optimizing the content of Mg and Si, which enhances the compatibility of conflicting characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the dielectric layer is made thinner to achieve compact size, then the capacitance density is improved, but the insulation resistance and high-temperature reliability deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the dielectric ceramic by incorporating specific rare earth elements (Dy, Gd, Tb, Ho, Y, Yb, Lu) in controlled amounts alongside Ba, Ca, Sr, Ti, and Zr. This compositional parameter change enables the dielectric layer to maintain high insulation resistance and reliability even at reduced thickness, while achieving improved capacitance density
Solution Approach 2:
The patent uses a composite dielectric ceramic material system combining multiple rare earth elements with traditional dielectric components. This composite approach creates synergistic effects where the rare earth elements modify the crystal structure and electrical properties, allowing thin dielectric layers to maintain both high insulation resistance and capacitance density
2Volume of moving object
If the dielectric layer is made thinner to reduce component size, then the specific permittivity is improved, but the temperature characteristics and climate proof performance worsen
Solution Approach 1:
The patent modifies the dielectric composition parameters by adding rare earth oxides (RA2O3, RB2O3, RC2O3) in specific molar ratios to the ABO3 perovskite structure. This parameter change stabilizes the crystal structure across temperature variations, enabling thin dielectric layers to maintain good temperature characteristics and climate proof performance while achieving compact size
Solution Approach 2:
The patent introduces rare earth elements at specific local positions within the dielectric ceramic crystal structure (substituting at A-site or B-site positions). This local modification of crystal structure quality enhances the temperature stability and climate resistance of the dielectric material, allowing thin layers to maintain performance under varying environmental conditions
3Reliability
If rare earth elements are added to improve dielectric properties, then the specific permittivity is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent combines multiple rare earth elements (Dy, Gd, Tb, Ho, Y, Yb, Lu) into a single integrated dielectric ceramic composition system. By merging these elements into one compositional framework with defined molar ratios, the patent achieves high specific permittivity while managing manufacturing complexity through a unified material system rather than separate processing steps
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, as a main component. The dielectric ceramic composition includes, as subcomponents, with respect to 100 moles of the compound, 1.0 to 2.5 moles of an oxide of RA (Dy, Gd and Tb); 0.2 to 1.0 mole of an oxide of RB (Ho and Y); 0.1 to 1.0 mole of an oxide of RC (Yb and Lu); 0.8 to 2.0 moles of Mg oxide and 1.2 to 3.0 moles of 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, the “α”, “β” and “γ” satisfy relations of 2.5≦(α/β)≦5.0 and 1.0≦(β/γ)≦10.0. According to the present invention, a dielectric ceramic composition having good properties can be provided.