Dielectric Composition Maintains Resistivity Under Reduced Atmosphere
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Solution Overview
Problem
Barium titanate-based dielectric compositions used in electronic components lose dielectric properties under high temperature or high voltage environments, and when fired under reduced atmospheres, they become semiconductors or conductors due to oxygen defects, failing to maintain insulating resistivity.
Innovation Solution
A dielectric composition with a complex oxide formula AaBbC4O15+α, where A includes Ba, B includes Zr, and C includes Nb, with excessive amounts of A and B relative to C, and the inclusion of aluminum oxides, which helps maintain high resistivity even when fired under reduced atmospheres.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If barium titanate based dielectric composition is used, then dielectric property is achieved under normal conditions, but dielectric property decreases under high temperature or high voltage environment
Solution Approach 1:
The patent uses a composite oxide system combining barium titanate (BaTiO3) with strontium zirconate (SrZrO3) and barium zirconate (BaZrO3) to create a dielectric composition that maintains high dielectric properties under both normal and extreme environmental conditions. The composite structure allows the material to leverage the high dielectric constant of BaTiO3 while the SrZrO3 and BaZrO3 components provide thermal stability and resistance to degradation under high temperature and voltage stress.
2Ease of manufacture
If base metals are used as internal electrode material, then cost is reduced, but oxidation occurs during firing requiring reduced atmosphere which causes oxygen defects in dielectric layer
Solution Approach 1:
The patent converts the harmful effect of reduced atmosphere firing (which typically causes oxygen defects and resistivity loss) into a beneficial outcome by formulating a dielectric composition that not only resists degradation but actually gains improved sintering characteristics and maintains high resistivity under reduction conditions. The specific oxide composition with controlled stoichiometry allows the material to tolerate and even benefit from the oxygen-deficient environment created by base metal electrode firing.
Solution Approach 2:
The patent modifies the chemical composition parameters of the dielectric layer by incorporating specific ratios of SrZrO3 and BaZrO3 alongside BaTiO3, and by controlling the oxygen stoichiometry (O15+α where α is controlled), to enable the material to maintain high resistivity under reduced atmosphere firing conditions. This parameter adjustment allows the dielectric to withstand the oxidative stress of base metal firing without degradation.
3Ease of manufacture
If dielectric layer is fired under reduced atmosphere with base metals, then electrode oxidation is prevented, but oxygen defects are generated causing resistivity to decrease
Solution Approach 1:
The patent transforms the harmful oxygen defects generated during reduced atmosphere firing into a non-problematic condition by formulating a dielectric composition that maintains high resistivity despite the presence of oxygen defects. The specific oxide system with controlled stoichiometry allows the material to tolerate oxygen vacancies without the usual degradation in electrical properties.
Solution Approach 2:
The composite oxide structure combining BaTiO3, SrZrO3, and BaZrO3 creates a dielectric system where the different components work synergistically to maintain electrical insulation properties under reduced atmosphere conditions, preventing the oxygen defects from compromising resistivity.
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 dielectric composition exhibits high resistivity and maintains dielectric properties, ensuring the electronic component functions effectively even under challenging environmental conditions, with improved mechanical strength and sintering properties due to the presence of aluminum oxides.
Implementation Method 1
When oxides (the dielectric composition) are fired under reduced atmosphere, oxygen is taken from the oxides, and oxygen defects and thus free electrons are easily generated.
Implementation Method 2
the dielectric composition including an oxide including aluminum... improved mechanical strength and sintering properties due to the presence of aluminum oxides
Data Source
AI summary
A dielectric composition including a complex oxide represented by a general formula of AaBbC4O15+α as a main component, in which “A” at least includes Ba, “B” at least includes Zr, “C” at least includes Nb, “a” is 3.05 or more, and “b” is 1.01 or more.