Composite Oxide Electret for High-Temperature Surface Potential
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Solution Overview
Problem
Existing electrets made from organic polymers suffer from thermal instability and performance degradation at high temperatures, limiting their use in devices that require high-temperature environments.
Innovation Solution
Development of an electret using a composite oxide with a crystalline or non-crystalline composition of A3B5O12, where A and B are trivalent metal elements, and optionally substituted with dopant elements, providing a band gap energy of 3 eV or more, which maintains high surface potential even at elevated temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If organic polymer materials are used for electrets, then shape flexibility and thickness controllability are improved, but thermal stability deteriorates
Solution Approach 1:
The patent uses inorganic compound materials (hydroxyapatite, complex oxides with perovskite or garnet structures) instead of organic polymers to create electrets with superior thermal stability while maintaining the necessary functional properties through material composition control
2Reliability
If inorganic compound materials are used for electrets, then thermal stability is improved, but surface potential generation mechanism becomes more complex
Solution Approach 1:
The patent controls the complexity by precisely adjusting compositional parameters (metal element ratios, dopant concentrations) and structural parameters (crystal structure type, grain size) of inorganic materials to optimize surface potential generation while maintaining thermal stability
3Adaptability or versatility
If electrets are used in high-temperature environments, then application versatility is improved, but performance degradation occurs
Solution Approach 1:
The patent achieves high-temperature performance stability by selecting inorganic materials with appropriate band gap energies and controlling their compositional and structural parameters to resist thermal degradation while enabling versatile high-temperature applications
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 electret maintains a stable high surface potential at temperatures up to 200°C, enhancing thermal stability and performance in high-temperature applications.
Implementation Method 1
The composite oxide has a band gap energy of 3 eV or more
Implementation Method 2
An electret is an electrically charged material that provides an electrostatic field to the surroundings
Data Source
AI summary
An electret is made by subjecting a composite oxide containing two or more metal elements to a polarization treatment. The composite oxide is a crystalline or non-crystalline oxide containing two different trivalent metal elements A and B, and has a basic composition represented by composition formula A3B5O12. The composite oxide has a band gap energy of 3 eV or more. The metal element A includes at least one element selected from trivalent rare earth elements, and the metal element B includes at least one element selected from trivalent typical elements.