Oxide Ceramic Variable Inductor Room Temperature Electromagnetic Coupling
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Solution Overview
Problem
Existing ferromagnetic dielectric materials struggle to produce electromagnetic effects at room temperature, and those that do often require significant magnetic bias or have limited electromagnetic coupling coefficients, making them unsuitable for practical ceramic electronic components.
Innovation Solution
The development of an oxide ceramic using a ferrite compound with specific substitution ratios of Sr, Ba, Co, Fe, Zn, Ni, and Al, which achieves a larger electromagnetic coupling coefficient at room temperature and in a zero or near-zero magnetic field, allowing for stable ferroelectricity and favorable electric polarization in low magnetic fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ferromagnetic dielectric materials are used, then electromagnetic effects can be produced, but they require significant magnetic bias and have limited electromagnetic coupling coefficients
Solution Approach 1:
The patent changes the chemical composition parameters of the ferrite compound by substituting specific elements (Ba for Sr, Zn/Ni for Co, Al for Fe) at controlled ratios. This modifies the material's intrinsic properties to achieve large electromagnetic coupling coefficients at room temperature without requiring magnetic bias, directly resolving the contradiction between reliability and device complexity
Solution Approach 2:
The patent creates a composite ferrite material with multiple substituted elements (Sr, Ba, Co, Fe, Zn, Ni, Al) in specific proportions. This composite structure combines the advantages of different elements to achieve both room temperature operation and high electromagnetic coupling without magnetic bias, resolving the technical contradiction
2Temperature
If ferromagnetic dielectric materials operate at room temperature, then practical electronic components can be manufactured, but electromagnetic coupling coefficients are limited and magnetic bias is required
Solution Approach 1:
The patent modifies the material composition parameters to shift the operational characteristics to room temperature. By controlling the substitution ratios of Ba, Zn, Ni, and Al in the ferrite structure, the material maintains stable ferroelectricity and achieves large electromagnetic coupling coefficients at room temperature without magnetic bias
Solution Approach 2:
The patent introduces local substitutions at specific crystallographic sites within the ferrite structure. Different elements substitute at different sites (Ba at Sr site, Zn/Ni at Co site, Al at Fe site), creating localized modifications that collectively enhance the overall electromagnetic coupling coefficient at room temperature
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
This approach enables the production of ceramic electronic components with enhanced electromagnetic effects, such as variable inductors, without the need for magnetic bias, and provides superior electric polarization and insulation properties, making them suitable for various electronic applications.
Implementation Method 1
the ferromagnetic dielectric material is known to exert a so-called electromagnetic effect: the action of a magnetic field induces helical magnetic ordering to produce ferroelectricity, thereby generating electric polarization, or causing changes in electric polarization or dielectric constant; and the action of an electric field generates magnetization or causes changes in magnetization
Implementation Method 2
a ferromagnetic dielectric (multiferroics) material, in which a ferromagnetic property and ferroelectricity coexist and exhibit a composite action
Implementation Method 3
a ferromagnetic dielectric (multiferroics) material, in which a ferromagnetic property and ferroelectricity coexist and exhibit a composite action
Data Source
AI summary
An oxide ceramic represented by the general formula [Sr2−xBaxCo2−y(ZnuNi1−u)yFe12−zAlzO22]. In the formula, 0.7≤x≤1.3 and 0.8≤z≤1.2. y is 0≤y≤0.8 when 0.5≤u≤1.0 and is 0≤y≤1.6 when 0≤u≤0.5. y is preferably 0.4 or less. Further, a variable inductor as a ceramic electronic component has a component base body formed from the oxide ceramic.