Effect of Neodymium Doping on Structure, Magnetic Properties and Microwave Absorption Performance of SrMnO3
JOURNAL OF RARE EARTHS（2024）
Guilin Univ Elect Technol
Abstract
A simple composite Sr1-xNdxMnO3(x=0,0.05,0.1,0.15,0.2)nano powders were successfully prepared by the sol-gel method as a light-weight broadband electromagnetic wave absorber.The effect of Nd3+doping on the structure,microstructure and properties of SrMnO3 was investigated.It is found that with the doping of Nd3+,the space group of the SrMnO3 changes from p63/mmc to pm3m,and the crystalline shape starts to change from hexagonal to cubic crystalline.Scanning electron microscopy(SEM)and Brunauer-Emmett-Teller(BET)tests confirm that the particle sizes of the sample decrease and the specific surface area increases,which are attributed to the inhibition of grain growth after Nd3+is doped.X-ray photoelectron spectroscopy(XPS)shows that after Nd3+doping,the content of oxygen vacancy increases,and Mn4+converts to Mn3+.Due to the defects of the materials,the polarization effect is enhanced,thus,the dielectric and magnetic properties of the doped samples are improved.The maximum reflection loss of the Sr0.85Nd0.15MnO3 is-33.41 dB at 7.84 GHz for a thickness of 2.4 mm,while Sr0.9Nd0.1MnO3 has the best bandwidth performance at 2.32 GHz with a reflection loss below-10 dB.
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Key words
Sr1-xMnxO3,Crystal structure,Microwave absorption,Magnetic properties,Nano powder,Rare earths
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