Magnetoplumbite Ferrite Particles for High Frequency Radio Wave Absorption
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current radio wave absorbers using magnetoplumbite-type hexagonal ferrite particles face challenges in achieving excellent radio wave absorption performance in high frequency bands, as the absorption performance deteriorates when the aluminum-to-iron ratio is increased, often resulting in a two-phase crystal structure rather than a single-phase structure.
Innovation Solution
Developing particles of magnetoplumbite-type hexagonal ferrite with a single crystal phase, represented by the formula AFe(12−x)AlxO19, where A represents Sr, Ba, or Ca, and x ranges from 1.5 to 8.0, using a liquid phase method to ensure aluminum atoms integrate effectively, thereby maintaining excellent magnetic properties and radio wave absorption performance in high frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the aluminum-to-iron ratio is increased to absorb radio waves in higher frequency bands, then the applicable frequency range is extended, but the radio wave absorption performance deteriorates and a two-phase crystal structure forms
Solution Approach 1:
The patent optimizes the aluminum content parameter (x value) within a specific range (1.0 ≤ x ≤ 2.2) to achieve the desired frequency absorption while maintaining single-phase crystal structure and excellent absorption performance. This parameter optimization resolves the contradiction by finding the optimal balance point where high frequency absorption capability is achieved without sacrificing absorption efficiency or crystal phase stability.
2Adaptability or versatility
If the aluminum content is increased to target higher frequency bands, then the frequency band coverage is expanded, but the crystal phase stability deteriorates forming two-phase structure
Solution Approach 1:
The patent establishes a specific compositional parameter range (x value between 1.0 and 2.2) that maintains single-phase magnetoplumbite crystal structure while enabling absorption in higher frequency bands. This controlled parameter change allows the material to achieve broader frequency coverage without compromising crystal phase stability.
3Ease of manufacture
If conventional solid phase method is used to manufacture the ferrite particles, then the manufacturing process is simple, but the aluminum atoms do not integrate effectively resulting in poor magnetic properties
Solution Approach 1:
The patent replaces the conventional solid-state reaction method with a liquid-phase synthesis method. This substitution enables aluminum atoms to integrate effectively into the crystal lattice during the liquid phase reaction, achieving superior atomic-level mixing and integration that cannot be accomplished through simple mechanical mixing in the solid state.
Solution Approach 2:
The patent changes the synthesis phase parameter from solid to liquid, enabling effective atomic integration. The liquid-phase method allows for homogeneous distribution and effective integration of aluminum atoms at the molecular level, significantly improving manufacturing precision of the atomic structure while maintaining reasonable process complexity.
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 single crystal phase magnetoplumbite-type hexagonal ferrite particles effectively absorb radio waves in high frequency bands, offering improved magnetic properties and radio wave absorption performance, while the liquid phase method ensures a high aluminum content without deteriorating the crystal phase, thus enhancing the range of applicable frequencies.
Implementation Method 1
using a liquid phase method to ensure aluminum atoms integrate effectively
Implementation Method 2
particles of magnetoplumbite-type hexagonal ferrite... effectively absorb radio waves in high frequency bands
Implementation Method 3
A radio wave incident to the radio wave absorber including a magnetic material generates a magnetic field in the magnetic material
Data Source
AI summary
To provide magnetoplumbite-type hexagonal ferrite particles represented by Formula (1) and having a single crystal phase, and the application. In Formula (1), A represents at least one metal element selected from the group consisting of Sr, Ba, Ca, and Pb, and x satisfies 1.5≤x≤8.0.AFe(12−x)AlxO19 Formula (1)