BaTiO3 Dielectric Composition Balancing MLCC Capacitance and Insulation
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Solution Overview
Problem
Current multilayer capacitors face challenges in achieving high capacitance-to-size ratio, high withstand voltage, and reliability due to limitations in dielectric composition, particularly in terms of dielectric constant and insulation resistance, which affect their performance in electronic and electric devices.
Innovation Solution
A dielectric composition comprising a BaTiO3-based component, a donor component with dysprosium (Dy) and samarium (Sm) as lanthanide elements, and an acceptor component including Mg, Al, Mn, and V, optimized in specific molar ratios to enhance dielectric properties and reduce oxygen vacancies, is used in a multilayer capacitor with a laminated structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the dielectric constant of the dielectric composition is increased to achieve high capacitance-to-size ratio, then the capacitance performance is improved, but the insulation resistance deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molar ratios of donor components (lanthanide elements) and acceptor components (Mg, Al, Mn, V) in the dielectric composition. By optimizing these compositional parameters, the patent achieves a dielectric constant of 100 or more while maintaining insulation resistance of 105 ohm or more, resolving the contradiction between high capacitance and high insulation resistance
Solution Approach 2:
The patent uses composite materials by combining BaTiO3-based component with specific donor components (lanthanide elements such as Dy and Sm) and acceptor components (Mg, Al, Mn, V). This composite approach creates a synergistic effect where the donor components increase dielectric constant while acceptor components compensate for insulation resistance loss, achieving both high capacitance-to-size ratio and high insulation resistance simultaneously
2Quantity of substance
If the dielectric constant is increased to improve capacitance, then the capacitance-to-size ratio is improved, but the withstand voltage deteriorates
Solution Approach 1:
The patent controls the molar content of donor and acceptor components within specific ranges to optimize both dielectric constant and insulation resistance. This parameter optimization ensures that the capacitor achieves high capacitance-to-size ratio while maintaining withstand voltage of 3.0 V or more, resolving the contradiction between capacitance and withstand voltage
Solution Approach 2:
The composite dielectric composition combines BaTiO3 with lanthanide donor elements and Mg/Al/Mn/V acceptor elements. The acceptor components specifically address the withstand voltage issue by compensating for the insulating property degradation caused by high dielectric constant materials, enabling simultaneous achievement of high capacitance and high withstand voltage
3Ease of manufacture
If conventional dielectric compositions are used to simplify manufacturing, then the manufacturing process is simple, but the reliability and defect rate in mass production deteriorate
Solution Approach 1:
The patent optimizes the molar ratios of components within specific ranges (donor component 0.01-2.0 mol, acceptor component 0.01-5.0 mol relative to 100 mol BaTiO3) to ensure high reliability while maintaining manufacturability. These parameter specifications enable consistent quality in mass production without requiring complex manufacturing processes
Solution Approach 2:
The composite dielectric composition with specific component ratios improves reliability and reduces defect rates in mass production. The balanced combination of donor and acceptor components ensures stable sintering characteristics and high insulation resistance, leading to lower defect rates and longer lifespan while maintaining ease of manufacture
Data Source
AI summary
A dielectric composition includes a BaTiO3-based component as a main component, a donor component including a first element and a second element each having a shorter ionic radius and greater atomic weight than Ba, and an acceptor component including at least one of Mg, Al, Mn and V. An ionic radius of the second element is greater than an ionic radius of the first element, a molar content of the second element is less than a molar content of the first element, and a molar content of the acceptor component is greater than a molar content of the donor component.