Electromagnetic wave absorption performance of Ti2O3 and vacancy enhancement effective bandwidth

doi:10.1016/j.jmst.2020.11.001

Abstract

Abstract:

The microwave absorption properties of Ti₂O₃ were systematically investigated. Experimental results indicate that Ti₂O₃ has microwave absorption performance with a minimum reflection loss value of -37.6 dB at 18.6 GHz and an effective absorption bandwidth (RL < -10 dB) of 2 GHz. Further, vacancy defects were introduced into Ti₂O₃ by carbothermal reduction. Interestingly, the effective absorption bandwidth of Ti₂O₃ with vacancy defects reach 3.2 GHz. First-principles calculations provide evidence that vacancy defects result in the changes of electric dipole state, leading to a wider effective absorption bandwidth. These results have significance in understanding the origin of electromagnetic phenomena and developing electromagnetic wave absorption materials.

Key words: Ti₂O₃, Microwave absorption, Vacancy, Electric dipolesFirst-principles

Xiankai Fu, Bo Yang, Wanqi Chen, Zongbin Li, Haile Yan, Xiang Zhao, Liang Zuo. Electromagnetic wave absorption performance of Ti₂O₃ and vacancy enhancement effective bandwidth[J]. J. Mater. Sci. Technol., 2021, 76: 166-173.

Figures/Tables 7

Fig. 1. (a) XRD patterns of the T, C, and TC samples. (b) Vacancy formation energy for Ti2O3. SEM images of (c) T and (d) TC.

Fig. 2. Reflection loss as a function of the frequency, revealing the EMW absorption performance of (a) T, (b) C, and (c) TC.

Fig. 3. Frequency dependence of (a) ε' and (b) ε” of complex permittivity, and (c) μ' and (d) μ” of complex permeability for T, C, and TC samples.

Fig. 4. Frequency dependence of the 3D plots and simulated RL curves for (a) T, (b) C, and (c) TC with various thicknesses, respectively.

Fig. 5. The structure models for (a) Ti2O3, (b) Ti2O3 with 3.33 at.% oxygen vacancy, and (c) Ti2O3 with 6.67 at.% oxygen vacancy. The front views of charge density difference for (d) Ti2O3, (e) Ti2O3 with 3.33 at.% oxygen vacancy, and (f) Ti2O3 with 6.67 at.% oxygen vacancy.

Fig. 6. The top views of electron density configuration for (a) Ti2O3, (b) Ti2O3 with 3.33 at.% oxygen vacancy, and (c) Ti2O3 with 6.67 at.% oxygen vacancy. The top views of charge density difference for (d) Ti2O3, (e) Ti2O3 with 3.33 at.% oxygen vacancy, and (f) Ti2O3 with 6.67 at.% oxygen vacancy.

Fig. 7. Schematic illustration showing the mechanisms involved during EMW absorption for the Ti2O3.

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Electromagnetic wave absorption performance of Ti₂O₃ and vacancy enhancement effective bandwidth

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