Dielectric Composition for Low-Temperature High-Density Sintering
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Solution Overview
Problem
Existing dielectric compositions fail to achieve high sintering density and specific dielectric constant when fired at low temperatures, and often contain lead or alkali metals, which are environmentally regulated.
Innovation Solution
A dielectric composition comprising {BaxSr(1-x)}mTa4O12 with specific ranges of m, silicon, and magnesium, optionally with manganese and rare-earth elements, is used to achieve high sintering density and dielectric constant without lead or alkali metals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a high-density dielectric substance is not fired at a high temperature, then energy consumption is reduced, but sintering density is not achieved
Solution Approach 1:
The patent changes the chemical composition parameters of the dielectric material by incorporating specific ratios of barium, strontium, and tantalum oxides, along with silicon and magnesium additives. This compositional parameter change enables the material to achieve high sintering density at lower firing temperatures, directly resolving the contradiction between temperature reduction and density achievement
Solution Approach 2:
The patent creates a composite dielectric material system combining multiple oxide components ({BaxSr(1-x)}mTa4O12 with silicon and magnesium additives). This composite approach synergistically combines the high dielectric properties of the main component with the sintering enhancement effects of the additives, enabling low-temperature high-density sintering
2Reliability
If lead or alkali metals are used to achieve high specific dielectric constant, then dielectric performance is improved, but environmental compliance deteriorates
Solution Approach 1:
The patent extracts and removes harmful lead and alkali metal components from the dielectric composition. By eliminating these environmentally harmful substances while maintaining the core {BaxSr(1-x)}mTa4O12 structure with silicon and magnesium additives, the patent achieves both high dielectric performance and RoHS compliance
Solution Approach 2:
The patent changes the chemical composition parameters by substituting lead and alkali metals with environmentally friendly alternatives. The specific ratio parameters of barium, strontium, silicon, and magnesium are optimized to achieve the required dielectric constant without using prohibited substances
3Temperature
If silicon and magnesium are added in specific amounts, then sintering initiation temperature is lowered, but composition complexity increases
Solution Approach 1:
The patent optimizes the composition parameters by specifying precise ranges for silicon (7.5 to 15.0 parts by mole) and magnesium (5.0 to 22.5 parts by mole) content. These parameter optimizations enable low-temperature sintering while maintaining manageable composition complexity through defined quantitative relationships
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 sintering density and specific dielectric constant even at low firing temperatures, with improved resistance and reduced environmental impact.
Implementation Method 1
a high sintering density is obtained even when being fired at a relatively low temperature
Implementation Method 2
a specific dielectric constant is high
Data Source
AI summary
Provided is a dielectric composition containing: a main component expressed by {BaxSr(1-x)}mTa4O12; and a first subcomponent, m satisfying a relationship of 1.95≤m≤2.40. The first subcomponent includes silicon and magnesium. When the amount of the main component contained in the dielectric composition is set to 100 parts by mole, the amount of silicon contained in the dielectric composition is 7.5 to 15.0 parts by mole in terms of SiO2, and the amount of magnesium contained in the dielectric composition is 5.0 to 22.5 parts by mole in terms of MgO.