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Abstract
In this work, Sr1-xSmxMnO3(x = 0,0.5) powders were prepared by solid-state reaction method. The effects of Sm doping on structure, electromagnetic properties and microwave absorption performance of SrMnO3 were systematically investigated by experimental characterizations and first-principles calculations. It is found that the doping of Sm transforms the hexagonal structure P63/mmc of SrMnO3(SMO) into an orthorhombic phase Pnma of Sr0.5Sm0.5MnO3 (SSMO) at room temperature. Sm doping and the increase of Mn3+ content induce the lattice distortion, resulting in octahedral torsion and the Mn–O–Mn bond angle towards 180°. Furthermore, doping introduces additional oxygen vacancies and defects in SMO, significantly enhancing various polarizations within the system. As a result, there is a substantial improvement in the microwave absorption capability of the doped sample. Compared to undoped SMO, SSMO performs excellent microwave absorbing properties in the higher frequency band and the value of reflection loss has increased by 29.47 dB at the optimal matching thickness.
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