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Phosphorus Vacancy-Induced Built-In Electric Field for Electromagnetic Properties Modulation
Yu Zhang1,2, Pengfei Hu3, Pei-Yan Zhao1,2
1Center for Bioinspired Science and Technology, Hangzhou International Innovation Institute, Beihang University, Hangzhou, 311115, P. R. China.
Summary
Engineering phosphorus vacancies (VP) in metal phosphides creates built-in electric fields, enhancing electromagnetic properties for advanced microwave absorption materials.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Electromagnetism
Background:
- Anion vacancy engineering is key for tuning electromagnetic (EM) properties via built-in electric fields (BIEFs).
- Systematic comparison of different anion vacancies' effects on defect-induced polarization is needed.
- Group VA anion vacancies, especially phosphorus vacancies (VP), offer a promising avenue for EM property modulation.
Purpose of the Study:
- To systematically compare the influence of various anion vacancies on defect-induced polarization.
- To investigate the EM property modulation mechanisms and structure-property relationships in NiCo0.5Fe0.5P1-x with varying VP content.
- To explore the potential of VP in designing advanced microwave absorption (MA) materials.
Main Methods:
- Synthesis of NiCo0.5Fe0.5P1-x materials with controlled phosphorus vacancy concentrations.
- Characterization of material structure and electromagnetic properties.
- Analysis of defect-induced polarization and BIEFs.
Main Results:
- High VP content leads to more intense BIEFs, enhancing defect-induced polarization, permittivity, and dielectric loss.
- NiCo0.5Fe0.5P1-x3 with high VP exhibits significant reflection loss (RL) and wide effective absorption bandwidth (EAB) across the X-band.
- VP effectively enhances multi-band microwave absorption (MA) performance.
Conclusions:
- Phosphorus vacancies (VP) are effective in modulating EM properties and enhancing MA performance.
- The study provides a constructive approach for utilizing group VA anion vacancies, particularly VP, in EM applications.
- This work offers a viable strategy for designing advanced metal phosphide MA materials with improved multi-band absorption capabilities.
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