Dielectric Ceramic Composition for High-Density Multilayer Capacitors
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in achieving high performance and reliability with thinner dielectric layers and increased number of layers, requiring a dielectric ceramic composition that maintains good temperature characteristics and efficiency.
Innovation Solution
A dielectric ceramic composition with a perovskite crystalline structure, comprising specific ratios of rare-earth oxides, Mg oxide, and Si oxide, along with additional subcomponents like V, Mo, Mn, and Cr oxides, to enhance specific permittivity, temperature stability, and lifespan, while controlling particle size and layer thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If dielectric layers are made thinner to reduce device size and increase layer count, then device integration density is improved, but reliability and temperature characteristics deteriorate due to higher electric intensity
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 thinner dielectric layers to maintain adequate breakdown voltage and reliability despite reduced thickness, resolving the contradiction between miniaturization and reliability.
Solution Approach 2:
The patent creates a composite dielectric ceramic material combining multiple rare-earth elements with traditional perovskite-forming elements. This composite approach leverages the beneficial properties of each element to achieve both thin-layer compatibility and high reliability, with the rare-earth elements providing enhanced electrical stability and temperature characteristics.
2Productivity
If dielectric layers are made thinner to achieve higher performance, then capacitance density is improved, but temperature characteristics worsen
Solution Approach 1:
The patent adjusts the compositional parameters by incorporating rare-earth elements that stabilize the perovskite structure across a wide temperature range. This enables thin dielectric layers to maintain consistent capacitance-temperature characteristics (such as X7R or Y5V ratings) even at reduced thickness, achieving both high capacitance density and temperature stability.
Solution Approach 2:
The patent applies local quality by distributing rare-earth elements specifically within the dielectric layer composition to provide localized temperature stabilization. This targeted compositional modification ensures that temperature characteristics are maintained at the dielectric layer level, enabling thin layers to achieve desired capacitance-temperature performance.
3Productivity
If the number of dielectric layers is increased to improve performance, then capacitance is improved, but manufacturing precision requirements worsen
Solution Approach 1:
The patent modifies the chemical composition parameters to include rare-earth elements that provide broader processing windows and more stable sintering behavior. This enables manufacturers to achieve consistent thin-layer thickness control across multiple layers with reduced sensitivity to processing variations, facilitating high-layer-count construction with acceptable manufacturing precision.
Solution Approach 2:
The rare-earth element composition provides self-stabilizing effects during sintering and processing, where the material inherently maintains its structural integrity and dimensional stability. This self-service property reduces the stringency of external manufacturing controls needed, enabling high-layer-count devices to be manufactured with practical precision requirements.
Data Source
AI summary
A multilayer ceramic composition showing good characteristics, even when electric intensity on dielectric layers is high and a stacked number of a multilayer ceramic capacitor is increased, and an electronic device thereof. Said composition comprises: a perovskite compound ABO3, and with respect to 100 moles of said compound, 0.6 or more to 1.4 or less moles of Ra2O3 in which Ra is at least one of Dy, Gd and Tb, 0.2 or more to 0.7 or less moles of Rb2O3 in which Rb is at least one of Ho and Y, and 0.2 or more to 0.7 or less moles of Rc2O3 in which Rc is at least one of Yb and Lu, in terms of each oxide, 0.6 or more to 1.6 or less moles of Mg oxide in terms of Mg, and 0.6 or more to less than 1.2 moles of Si included compound in terms of Si.