Dielectric Composition for Low-Temperature High-Density Sintering
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Solution Overview
Problem
Existing dielectric compositions require high-temperature firing to achieve high density and high relative permittivity, which can lead to oxygen vacancy defects, resistivity reduction, and dielectric loss, and often include restricted substances like lead and alkali metals.
Innovation Solution
A dielectric composition comprising tantalum, barium, and strontium as main components, with vanadium, titanium, or aluminum as subcomponents, fired at relatively low temperatures to achieve high density and relative permittivity while excluding niobium, alkali metals, and lead, thereby controlling valence changes and preventing resistivity reduction and dielectric loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high-temperature firing is performed to achieve high density and high relative permittivity, then the dielectric properties are improved, but oxygen vacancy defects increase, resistivity decreases, and dielectric loss increases
Solution Approach 1:
The patent changes the chemical composition parameters by excluding niobium and using specific ratios of barium, strontium, and tantalum oxides. This compositional parameter change allows the material to achieve high density at lower firing temperatures without the harmful effects of oxygen vacancy defects, thereby maintaining high resistivity while achieving the desired dielectric properties
Solution Approach 2:
The patent creates a composite dielectric material system combining multiple metal oxides (barium oxide, strontium oxide, tantalum oxide) in specific ratios. This composite approach synergistically achieves high density and high relative permittivity at lower firing temperatures without causing oxygen vacancy defects, thus preventing resistivity reduction and dielectric loss
2Quantity of substance
If high-temperature firing is performed to achieve high density and high relative permittivity, then the dielectric properties are improved, but dielectric loss increases
Solution Approach 1:
The patent modifies the chemical composition parameters by excluding niobium and using specific ratios of barium, strontium, and tantalum oxides. This parameter change enables the material to achieve high density at lower firing temperatures without generating oxygen vacancy defects, thereby preventing dielectric loss while maintaining the desired dielectric performance
Solution Approach 2:
The patent develops a composite dielectric system using multiple metal oxides in optimized ratios. This composite material approach achieves high density and low dielectric loss simultaneously by avoiding the high-temperature firing that causes oxygen vacancy defects and energy loss, thus resolving the contradiction between density and dielectric loss
3Ease of manufacture
If alkali metals are included in the dielectric composition, then the firing process is facilitated, but composition deviation occurs and furnace contamination increases
Solution Approach 1:
The patent extracts and removes alkali metals from the dielectric composition to eliminate the problems of composition deviation and furnace contamination. By taking out the harmful alkali metal components, the patent achieves precise compositional control and prevents furnace dirt while still facilitating the firing process through alternative compositional design using barium, strontium, and tantalum oxides
4Reliability
If lead is included in the dielectric composition, then the dielectric properties are improved, but environmental compliance is violated
Solution Approach 1:
The patent extracts and removes lead from the dielectric composition to achieve environmental compliance with RoHS directives. By taking out the harmful lead component, the patent maintains high dielectric properties through alternative compositional design using barium, strontium, and tantalum oxides, thus resolving the contradiction between dielectric performance and environmental compliance
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 achieves high density, high relative permittivity, and low dielectric loss at a wide range of temperatures without using restricted substances, maintaining high resistivity and adhering to environmental regulations.
Implementation Method 1
such newly developed dielectric composition needs to be fired at a high temperature to become a high-density dielectric
Implementation Method 2
The valence of element constituting dielectric composition is less likely to change when reduction firing is performed in order to fire the dielectric composition together with a base metal
Data Source
AI summary
In order to provide a dielectric composition having high density even when fired at a relatively low temperature, the main component of a dielectric composition includes tantalum and at least one of barium or strontium, and the subcomponent of the dielectric composition includes at least one element selected from the group consisting of vanadium, titanium, and aluminum.