Perovskite Ceramic Powder Doping for Thin MLCC Insulation Stability
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Solution Overview
Problem
Multilayer ceramic capacitors face reliability and insulation characteristic degradation when dielectric layer thickness is reduced, due to oxygen defects and imbalance in donor and acceptor effects in existing technologies.
Innovation Solution
Ceramic raw material powder with a perovskite structure, where elements acting as donors and acceptors are solid-solved in B sites, with specific concentration and valence relationships to maintain both donor and acceptor effects, and a manufacturing method involving the formation of green sheets and firing to achieve a balanced multilayer structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a donor element is solid-solved in barium titanate to improve life, then reliability is improved, but insulation characteristic degrades
Solution Approach 1:
The patent applies parameter changes by precisely controlling the concentration ratios of donor and acceptor elements. The specific relationship (concentration of donor)×(valence of donor−4)(concentration of acceptor)×(4−valence of acceptor)≤1×10⁻⁶ allows optimization of electrical properties to achieve both improved life and maintained insulation characteristics.
Solution Approach 2:
The patent uses composite materials by combining multiple elements (barium, titanium, and both donor and acceptor elements) in a perovskite structure. This composite approach at the atomic level enables simultaneous achievement of donor effect for life improvement and acceptor effect for insulation maintenance.
2Object-generated harmful factors
If both donor and acceptor elements are solid-solved to suppress insulation degradation, then insulation characteristic is improved, but donor effect degrades
Solution Approach 1:
The patent resolves this contradiction through precise parameter control of element concentrations. By satisfying the specific mathematical relationship between donor and acceptor concentrations and valences, the patent achieves optimal balance where both insulation characteristics and donor effect are maintained.
3Productivity
If dielectric layer thickness is reduced to increase capacity, then productivity is improved, but reliability degrades due to oxygen defects
Solution Approach 1:
The patent applies parameter changes by controlling the concentration and valence of donor and acceptor elements in the ceramic raw material powder. This enables production of thin dielectric layers with reduced oxygen defects, achieving both high capacity and reliability.
Solution Approach 2:
The patent applies preliminary action by pre-solid-solving both donor and acceptor elements in the ceramic raw material powder before forming the dielectric layers. This preliminary doping ensures proper elemental distribution and reduces oxygen defects during the subsequent firing process, enabling reliable thin-film fabrication.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively suppresses oxygen defects, enhances insulation characteristics, and maintains a balance between life and reliability, ensuring improved performance and capacity in multilayer ceramic capacitors.
Implementation Method 1
an element acting as a donor and an element acting as an acceptor are solid-solved in B sites of the perovskite structure
Implementation Method 2
barium titanate in which a donor element is solid-solved is used. With the technology, although life of the multilayer ceramic capacitor is improved because of donor effect
Implementation Method 3
barium titanate in which a donor element and an acceptor element are solid-solved is used. However, with the technology, although the degradation of the insulation characteristic can be suppressed, the donor effect may be degraded
Implementation Method 4
The dielectric layers are formed by sintering ceramic raw material powder
Data Source
AI summary
Ceramic raw material powder includes: a main phase having a perovskite structure, wherein elements acting as a donor and an acceptor are solid-solved in B sites of the perovskite structure, wherein a first relationship of value A<value B is satisfied in a center region of each grain of the ceramic raw material powder; a second relationship of value A>value B is satisfied in a circumference region of each grain of the ceramic raw material powder, and value A in the second relationship gradually decreases from the circumference region to the center, wherein value A is a value of (concentration of the element acting as a donor)×(valence of the element acting as a donor−4), and value B is a value of (concentration of the element acting as an acceptor)×(4−valence of the element acting as an acceptor).