BaTiO3 Dielectric Composition for Low-Temperature Sintering
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Solution Overview
Problem
The challenge in manufacturing multilayer ceramic capacitors is the shrinkage and oxidation of nickel internal electrodes at high temperatures, leading to stress, short circuits, and decreased capacitance, which requires a dielectric composition capable of low-temperature sintering to maintain reliability and stability.
Innovation Solution
A dielectric composition containing BaTiO3 as the main ingredient and a Li2O—BaO compound as an accessory ingredient, with a content of 0.2 mol % to 0.8 mol %, is used for low-temperature sintering, reducing the sintering temperature and preventing electrode aggregation, while maintaining high capacitance and insulation resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sintering temperature is increased to ensure dielectric layer formation, then dielectric properties are improved, but nickel internal electrodes shrink and oxidize causing stress and reliability deterioration
Solution Approach 1:
The patent changes the chemical composition parameters of the dielectric layer by incorporating specific amounts of Li2O (0.01-0.5 wt%) and BaO (0.1-0.5 wt%) along with ZnO (1-5 wt%) to enable sintering at lower temperatures (900-1100°C) while maintaining dielectric properties and preventing electrode degradation
Solution Approach 2:
The patent creates a composite dielectric material system combining BaTiO3 base material with multiple oxide additives (Li2O, BaO, ZnO) that work synergistically to achieve low-temperature sintering with good dielectric properties and electrode compatibility
2Temperature
If sintering temperature is decreased to prevent electrode shrinkage, then electrode stability is improved, but dielectric layer formation and densification become difficult
Solution Approach 1:
The patent modifies the chemical composition parameters of the dielectric layer by incorporating specific amounts of Li2O (0.01-0.5 wt%) and BaO (0.1-0.5 wt%) along with ZnO (1-5 wt%) to enable sintering at lower temperatures (900-1100°C) while maintaining dielectric properties and preventing electrode degradation
Solution Approach 2:
The patent introduces localized chemical modifications through oxide additives that create favorable sintering conditions in specific regions of the dielectric layer, promoting densification and grain growth at lower temperatures without affecting the overall electrode structure
3Volume of moving object
If dielectric layer thickness is reduced to achieve miniaturization, then device size is decreased, but capacitance stability and reliability become more difficult to maintain
Solution Approach 1:
The patent changes the chemical composition parameters of the dielectric layer by incorporating specific amounts of Li2O (0.01-0.5 wt%) and BaO (0.1-0.5 wt%) along with ZnO (1-5 wt%) to enable sintering at lower temperatures (900-1100°C) while maintaining dielectric properties and preventing electrode degradation
Solution Approach 2:
The patent uses oxide additives (Li2O, BaO, ZnO) as intermediary substances that facilitate low-temperature sintering and improve the quality of thin dielectric layers, enabling reliable miniaturization by acting as mediators between the conflicting requirements of thinness and stability
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 composition allows for dense microstructure and improved dielectric properties at low temperatures, preventing nickel internal electrode aggregation and ensuring high reliability and capacitance, with a sintering temperature range of 1000° C. to 1150° C., enhancing the performance of multilayer ceramic electronic components.
Implementation Method 1
a dielectric composition for low-temperature sintering may contain BaTiO3 as a main ingredient; and a Li2O—BaO compound as an accessory ingredient... The composition allows for dense microstructure and improved dielectric properties at low temperatures, preventing nickel internal electrode aggregation and ensuring high reliability and capacitance, with a sintering temperature range of 1000° C. to 1150° C.
Implementation Method 2
when a sintering temperature exceeds 1200° C., nickel internal electrodes may be shrunk. In this case, stress may be generated in the multilayer ceramic capacitor due to a difference in shrinkage behaviors between the internal electrodes and the dielectric layers. In addition, as the nickel internal electrodes are shrunk, the possibility of short circuits is rapidly increased, and the electrode connectivity or coverage may be decreased due to oxidation of the internal electrodes
Data Source
AI summary
There are provided a dielectric composition for low-temperature sintering and a multilayer ceramic electronic component manufactured using the dielectric composition and the dielectric composition may contains: BaTiO3 as a main ingredient; and a Li2O—BaO compound as an accessory ingredient, wherein the accessory ingredient is contained in an amount of 0.2 mol % to 0.8 mol %, on the basis of 100 mol % of the main ingredient.