Dielectric Ceramic Composition for Thin Multilayer Capacitors
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Solution Overview
Problem
Existing multilayer ceramic capacitors face challenges in achieving desired characteristics such as specific permittivity, dielectric loss, CR product, capacitance temperature characteristic, and high-temperature accelerated lifetime when the dielectric layer is made thinner, as the specific permittivity decreases with smaller particle sizes.
Innovation Solution
A dielectric ceramic composition with a perovskite-type crystal structure, including compounds like BaTiO3, with controlled proportions of Mg, Mn, Cr, V, Mo, W, Y, Yb, Er, Ho, Dy, Gd, and Tb oxides, and Ba and Ca, Si, which allows for improved solute metal element control, maintaining high performance even at thinner layer thicknesses.
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 increases, but the specific permittivity decreases leading to poor characteristics
Solution Approach 1:
The patent changes the chemical composition parameters of the dielectric layer by introducing specific oxide components (MgO: 0.6-2.0 moles, MnO/Cr2O3: 0.010-0.6 mole, V2O5/MoO3/WO3: 0.010-0.2 mole, rare earth oxides R1 and R2: 0.10-1.0 mole each, and BaO-CaO-SiO2: 0.2-1.5 moles) to maintain specific permittivity even when the dielectric layer thickness is reduced to 1 μm or less
Solution Approach 2:
The patent uses a composite dielectric material system combining barium titanate (ABO3) with multiple oxide additives including MgO, MnO, Cr2O3, V2O5, MoO3, WO3, and rare earth oxides (R1: Y, Yb, Er, Ho; R2: Dy, Gd, Tb) to achieve both thin layer thickness and high specific permittivity through synergistic effects of the composite composition
2Length of stationary object
If the particle size is reduced to make the dielectric layer thinner, then the layer thickness decreases, but the specific permittivity decreases making desired characteristics unattainable
Solution Approach 1:
The patent changes the compositional parameters by adding specific oxide components to compensate for the reduction in particle size effects, maintaining specific permittivity above 2000 even when dielectric layer thickness is reduced to 1 μm or less through controlled composition modification
Solution Approach 2:
The patent introduces oxide components (particularly MgO, MnO, Cr2O3, and rare earth oxides) as intermediary substances that mediate between the reduced particle size and the required specific permittivity, allowing thin layers to achieve high permittivity through the moderating effect of these additive oxides
Data Source
AI summary
A dielectric ceramic composition includes, as a main component, a compound having perovskite type crystal structure shown by a general formula ABO3, as subcomponents, in terms of respective element with respect to 100 moles of the compound, and 0.6 to 2.0 moles of an oxide of Mg, 0.010 to 0.6 mole of oxide of Mn and/or Cr, 0.010 to 0.2 mole of an oxide of at least one selected from V, Mo and W, 0.10 to 1.0 mole of an oxide of R1 (R1 is at least one selected from Y, Yb, Er and Ho), 0.10 to 1.0 mole of an oxide of R2 (R2 is at least one selected from Dy, Gd and Tb) and 0.2 to 1.5 moles of a component consisting of an oxide of Ba and/or oxide of Ca and an oxide of Si. According to the present invention, even when a dielectric layer is made thinner, a dielectric ceramic composition having good characteristics can be provided.