MLCC Dielectric Composition for X5R Stability and Insulation Resistance
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in maintaining reliability and satisfying X5R properties due to insulation resistance degradation caused by oxygen vacancy movement, especially under high-temperature environments.
Innovation Solution
A multilayer electronic component is designed with a dielectric layer comprising acceptor elements like vanadium (V), donor elements such as rare earth elements, and titanium (Ti), where specific mole ratios of these elements are optimized to ensure 1.2 ≤ Dm/Am ≤ 1.4 and 0.2 ≤ Vm/Dm, thereby improving reliability and achieving X5R properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rare earth elements are added excessively to reduce oxygen vacancies and improve reliability, then insulation resistance degradation is prevented, but temperature characteristics (TCC properties) deteriorate
Solution Approach 1:
The patent optimizes the concentration parameters of rare earth elements (donor elements) and acceptor elements in the dielectric layer to specific ranges (donor elements: 0.01-0.1 wt%, acceptor elements: 0.01-0.05 wt%). This parameter optimization resolves the contradiction by finding the precise concentration point where reliability is improved without excessive rare earth element addition that would harm TCC properties.
Solution Approach 2:
The patent creates a composite doping system combining both donor elements (rare earth elements like La, Ce, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, Lu) and acceptor elements (Mg, Al, Mn, Zn, Ca, Sr, Ba, Pb) in the dielectric layer. This composite approach allows the donor elements to reduce oxygen vacancies and improve reliability while acceptor elements compensate to maintain stable TCC properties, resolving the contradiction through synergistic material composition.
2Reliability
If the concentration of oxygen vacancies is reduced to prevent insulation resistance degradation, then reliability improves, but the composition complexity increases
Solution Approach 1:
The patent simplifies the composition complexity by optimizing the concentration parameters of doping elements to specific ranges. By controlling donor elements at 0.01-0.1 wt% and acceptor elements at 0.01-0.05 wt%, the patent achieves oxygen vacancy reduction without excessive compositional complexity, making the manufacturing process more controllable.
Solution Approach 2:
The patent introduces acceptor elements (Mg, Al, Mn, Zn, Ca, Sr, Ba, Pb) as intermediary components that mediate between the donor elements (rare earth elements) and the oxygen vacancies. These acceptor elements help control the oxygen vacancy concentration without requiring excessive donor element addition, thereby reducing composition complexity while maintaining reliability improvement.
Data Source
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AI summary
A multilayer electronic component includes a body including a dielectric layer and an internal electrode; and an external electrode disposed on the body, wherein the dielectric layer includes acceptor elements including vanadium (V), donor elements including rare earth elements, and titanium (Ti), and wherein, when the number of moles of the acceptor elements per 100 moles of titanium (Ti) is defined as Am, the number of moles of the donor elements per 100 moles of titanium (Ti) is defined as Dm, and the number of moles of vanadium (V) based on per of titanium (Ti) is defined as Vm, 1.2 ≤ Dm/Am ≤ 1.4 and 0.2 ≤ Vm/Dm is satisfied.