Electromagnetic wave absorption performance of Ti2O3 and vacancy enhancement effective bandwidth

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.