Multilayer Ceramic Capacitor Segregation Phase Localization
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Solution Overview
Problem
Multilayer ceramic electronic components, such as capacitors, face challenges in achieving improved highly accelerated lifetime and specific permittivity due to non-uniform electric fields caused by segregation phases with different resistances, leading to local deterioration and insufficient permittivity.
Innovation Solution
A multilayer ceramic component with a dielectric layer comprising a dielectric ceramic composition of ABO3 (A = Ba, Sr, Ca; B = Ti, Zr, Hf) and rare earth elements, where segregation phases with rare earth components are localized to contact the internal electrode layer, ensuring 96% or more of the segregation phase area contacts the electrode, and the maximum segregation phase length is 100% or less of the electrode thickness, embedding 50% or more of the phases within the electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If segregation phases with different composition are present in the dielectric layer, then specific permittivity can be enhanced, but resistance varies in stacking direction causing non-uniform electric field and local deterioration
Solution Approach 1:
The patent applies local quality by restricting segregation phases to specific locations within the dielectric layer. Instead of uniformly distributing segregation phases throughout the dielectric layer, the invention confines them to regions adjacent to internal electrode layers, where they can enhance permittivity without creating non-uniform electric fields across the entire layer. This localized approach allows the dielectric layer to maintain compositional stability while still benefiting from the high permittivity of rare earth-containing phases where needed.
Solution Approach 2:
The internal electrode layer serves as an intermediary that mediates between the segregation phases and the bulk dielectric layer. By positioning segregation phases adjacent to the electrode layer, the electrode acts as a buffer that prevents these high-resistance phases from creating non-uniform electric fields across the entire dielectric layer. The electrode layer isolates the impact of segregation phases, allowing them to enhance permittivity locally without compromising overall electric field uniformity.
2Volume of moving object
If dielectric layer is made thinner to increase stacking number, then component becomes more compact, but reliability deteriorates due to non-uniform electric field and local deterioration
Solution Approach 1:
The patent applies local quality by concentrating segregation phases in specific regions adjacent to internal electrode layers rather than distributing them uniformly throughout the dielectric layer. This localized placement allows the dielectric layer to maintain thin dimensions for compactness while ensuring that high-resistance phases do not create non-uniform electric fields across the entire layer. The segregation phases enhance permittivity locally without compromising the overall reliability of the thin dielectric layer.
3Reliability
If segregation phases are distributed throughout the dielectric layer, then specific permittivity is enhanced, but insulation resistance decreases due to non-uniform electric field
Solution Approach 1:
The patent applies local quality by confining segregation phases to specific regions adjacent to internal electrode layers rather than distributing them uniformly throughout the dielectric layer. This localized placement allows the dielectric layer to maintain high specific permittivity where needed while preventing non-uniform electric fields from developing across the entire layer. By restricting segregation phases to localized regions, the invention maintains high insulation resistance while still achieving enhanced permittivity in the critical regions near the electrodes.
Data Source
AI summary
The object of the present invention is to provide a multilayer ceramic electronic component having improved highly accelerated lifetime and specific permittivity. A multilayer ceramic electronic component comprising a multilayer body in which an internal electrode layer and a dielectric layer are stacked in alternating manner, wherein the dielectric layer comprises a dielectric ceramic composition having a main component expressed by a general formula ABO3 (A is Ba and the like, and B is Ti and the like) and a rare earth component R, a segregation phase including the rare earth component R exists in the dielectric layer, an area ratio of the segregation phases in a cross section along a stacking direction is 104 ppm to 961 ppm, and 96% or more of a total area of the segregation phases contact with the internal electrode layer.