Tunable magnetic coupling and dipole polarization of core-shell Magnéli Ti4O7 ceramic/magnetic metal possessing broadband microwave absorption properties

Yang Li, Yuchang Qing, Biao Zhao, Pengwei Bai, Rui Zhang, Haoyang Yao, Fa Luo

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

There are few reports on the application of Magnéli Ti4O7 in the field of electromagnetic wave absorption. Herein, we designed and prepared a Ti4O7/magnetic metal composite via an electrostatic assembly with in-situ reduction reaction. This system utilized distinct magnetic coupling deriving from the subtle designed structures and magnetic-dielectric synergy. The core-shell magnetic metallic nanoparticles/oxygen deficient Ti4O7 are useful microwave absorbers in terms of wide broadband, strong absorption and ultra-low filler amount. The optimal reflection loss of Ti4O7@CoNi composite was −43.6 dB at 2.5 mm, meanwhile the effective absorbing band could reach over 5.12 GHz at only a 2.7 mm thickness. The results confirm that the dependence of the electromagnetic characteristics of the absorber on the filler ratio, frequency, and absorber thickness. Therefore, this work may be beneficial in constructing core-shell structured magnetic metal/Magnéli Ti4O7 composites to tune electromagnetic parameters and strengthen electromagnetic absorption.

Original languageEnglish
Pages (from-to)33373-33381
Number of pages9
JournalCeramics International
Volume47
Issue number23
DOIs
StatePublished - 1 Dec 2021

Keywords

  • Core-shell structure
  • Magnetic coupling
  • Microwave absorption
  • Oxygen vacancies
  • TiO/magnetic metal

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