Y-Rich Core-Shell Dielectric for Reliable Multilayer Capacitors
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in achieving smaller size, higher reliability, and improved electrical properties, especially when exposed to high heat and vibrations in automotive applications.
Innovation Solution
A multilayer electronic component with a dielectric layer comprising calcium (Ca), strontium (Sr), zirconium (Zr), titanium (Ti), manganese (Mn), yttrium (Y), and silicon (Si), featuring a core-shell structure in the dielectric grains, with a Ys/Yc ratio greater than 9, enhances dielectric properties and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dielectric layer uses a simple composition without core-shell structure, then the manufacturing process is simpler, but the dielectric properties and reliability are insufficient
Solution Approach 1:
The patent applies local quality by creating a core-shell structure where the center region (core) and outer region (shell) of dielectric grains have different compositions. The core contains Ca, Sr, Zr, and Ti in specific ratios, while the shell contains Mn, Y, and Si to suppress harmful effects. This localized compositional differentiation improves reliability without requiring complete structural redesign of the entire capacitor.
Solution Approach 2:
The patent uses composite materials by combining multiple oxide components (CaO, SrO, ZrO2, TiO2, MnO, Y2O3, SiO2) in specific proportions within the core-shell structure. The composite nature of the dielectric layer, with its differentiated core and shell regions, enables simultaneous achievement of high dielectric constant, quality factor, and reliability under high-temperature and high-vibration conditions.
2Quantity of substance
If the dielectric layer uses high-K ferroelectric material, then the capacitance is higher, but the temperature-capacitance stability deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the compositional ratios of multiple oxide components in the core-shell structure. The shell region contains Mn, Y, and Si in specific proportions (Mn: 2.0-4.0 mol%, Y: 1.0-3.0 mol%, Si: 1.0-3.0 mol% based on 100 mol% of CaO+SrO+ZrO2+TiO2) to suppress the temperature dependence of capacitance while maintaining high-K characteristics. This compositional parameter optimization enables temperature-capacitance stability within ±30 ppm/°C.
3Reliability
If the dielectric grains have uniform composition, then the manufacturing process is simpler, but the quality factor and breakdown voltage are lower
Solution Approach 1:
The patent applies local quality by creating a core-shell structure where the center region (core) and outer region (shell) of dielectric grains have different compositions. The core contains Ca, Sr, Zr, and Ti in specific ratios, while the shell contains Mn, Y, and Si to suppress harmful effects. This localized compositional differentiation improves reliability without requiring complete structural redesign of the entire capacitor.
Data Source
AI summary
A body including a dielectric layer and internal electrodes disposed alternately with the dielectric layer interposed therebetween; and external electrodes disposed on the body, wherein the dielectric layer includes a main component containing calcium (Ca), strontium (Sr), zirconium (Zr) and titanium (Ti) and a sub-component containing manganese (Mn), yttrium (Y) and silicon (Si), wherein the dielectric layer includes a plurality of dielectric grains and grain boundaries disposed between adjacent dielectric grains, and at least a portion of the plurality of dielectric grains has a core-shell structure, a content of yttrium (Y) included in a core relative to 100 moles of zirconium (Zr) included in the core and a shell is defined as Yc, a content of yttrium (Y) included in the shell relative to 100 moles of zirconium (Zr) included in the core and the shell is defined as Ys, and Ys/Yc>9 is satisfied.