Dielectric Ceramic Composition for Thin-Layer Capacitor Reliability
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Solution Overview
Problem
Laminated ceramic capacitors face reliability issues when the dielectric layer is thinned, leading to decreased performance and increased electric field intensity, particularly in high-temperature environments.
Innovation Solution
A dielectric ceramic composition with a perovskite crystal structure, incorporating specific rare earth oxides and silicon, along with additional sub-components, is used to create a dielectric layer that maintains reliability and performance even at reduced thicknesses, enhancing temperature characteristics and insulation resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the dielectric layer is thinned to achieve miniaturization, then the device size is reduced, but the reliability decreases due to increased electric field intensity
Solution Approach 1:
The patent changes the compositional parameters of the dielectric ceramic by incorporating specific rare earth elements (Eu, Ra, Rb) in controlled amounts to modify the electrical and mechanical properties of the material, enabling thinner layers to maintain reliability
Solution Approach 2:
The patent creates a composite dielectric material system combining barium titanate base ceramic with multiple rare earth oxide additives, where each component contributes specific properties that collectively enable thin-film reliability
2Quantity of substance
If the dielectric layer is thinned, then the capacitance density is improved, but the insulation resistance decreases
Solution Approach 1:
The patent modifies the material composition parameters by adding rare earth oxides to change the electrical breakdown strength and insulation characteristics, allowing thin layers to maintain high insulation resistance
Solution Approach 2:
The patent introduces localized compositional variations through rare earth element doping at grain boundaries and defect sites to enhance local insulation properties where electric field concentration occurs
3Quantity of substance
If the number of laminated layers is increased, then the capacitance is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent changes the dielectric material properties to achieve higher breakdown strength and better processability, enabling reliable fabrication of multi-layer structures with thinner individual layers
Data Source
AI summary
A dielectric ceramic composition and a ceramic electric device having a dielectric layer composed of the dielectric ceramic composition including a main component having a perovskite crystal structure expressed by general formula ABO3, an oxide of Eu, an oxide of Ra (Sc, Er, Tm, Yb and Lu), an oxide of Rb (Y, Dy, Ho, Tb and Gd) and an oxide of Si, in which 0.075≦α≦0.5, 0.5≦β≦3, 1.0≦γ≦4, 1.5≦δ≦5, and 0.030≦α/δ≦0.250 where a content of an oxide of Eu is α mole, a content of the oxide of Ra is β mole, a content of the oxide of Rb is γ mole, and a content of the second sub-component is δ mole with respect to 100 moles of the main component.