Structure, Morphology, and Electromagnetic Properties of Manganese Dioxide with Ni Doping

Hydrothermal synthesis between (NH (4))(2)S O-2 (8) and MnSO (4) was carried out to investigate the structure, morphology, and electromagnetic properties of Ni-doped MnO (2) with different doping amounts. The samples were characterized by X-ray powder diffraction (XRD), X-ray fluorescence spectrometry (XRF), scanning electron microscopy (SEM), and vector network analysis. The analysis results revealed that all the final products were alpha-MnO (2) and few amounts of gamma-MnO (2), and the morphology changed obviously with the increase of the Ni doping amount. The doping of Ni had a certain effect on the electromagnetic properties, and some other properties derived from electromagnetic performances were also investigated, such as dielectric and magnetic loss tangent and microwave-absorbing properties. All the reflection loss (RL) peaks of the final products were moving toward lower frequency with increasing thickness, and with the thickness of 2 mm, the final products all had the maximum effective absorption bandwidth (RL < -10 dB), and the Ni-doped MnO (2) had better reflection loss performance than the undoped MnO (2) in the range of high frequency.