Synthesis and Room-Temperature Ferromagnetism in Co-doped In2 O 3 Nanoparticles
We report room-temperature ferromagnetism in Co-doped In2 O 3 nanoparticles. Nanoparticles were synthesized by a simple polymerized complex method and were thoroughly characterized using X-ray diffraction, Raman spectroscopy, and transmission electron microscopy equipped with energy dispersive X-ray spectrometer. The XRD results confirmed the formation of In2 O 3 phase with cubic structure. The particle sizes of the powder were found to be 18–23 nm as evaluated by the X-ray line broadening method. The corresponding selected area electron diffraction analysis further confirmed the formation of cubic structure of In2 O 3 without any impurity phases. The valence state of Co ions was determined by using X-ray absorption near edge structure. The nanoparticles of Co-doped In2 O 3 revealed room-temperature ferromagnetism with the magnetization of ∼0.013–0.026 emu/g at 10 kOe. Our results indicate that room-temperature ferromagnetism of Co-doped In2 O 3 system is intrinsic and is not a result of any ferromagnetic impurity phases.
KeywordsRoom-temperature ferromagnetism Indium oxide Nanoparticles Cubic structure X-ray absorption near edge structure
The authors would like to thank the Synchrotron Light Research Institute (BL8) (Public Organization), Nakhon Ratchasima, Thailand, for XAS facilities. This work was supported by Mahasarakham University Development Fund and Mahasarakham University, Thailand.
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