Abstract
Single-phase nanocrystalline In2O3 doped with 5 atomic percent Mn produces dilute magnetic semiconductor (DMS). The material is synthesized by low temperature ‘pyrophoric reaction’ using nitrate salts and diethanolamine. The XRD pattern at room temperature reveals the formation of cubic bixbyite structure of the oxide with nano-structured grain which is confirmed by FESEM. Magnetization data confirms ferromagnetic behavior at room temperature with gradual decrease in magnetization with rise of temperature. The phase transition occurred at 500 K is attributed to the transformation of ferromagnetic to paramagnetic state of the nanometric sample. Curie–Weiss inverse magnetic susceptibility [χ−1(T)] plot against temperature deduced the effective Bohr magneton (μeff) to be ~ 3.65 μB/Mn ion. Ferromagnetism may have generated from mixed valence states (Mn4+major /Mn3+minor) of Mn which is 3d element. Valence state was determined by chemical method using redox reaction between Fe2+and Mn4+/ Mn3+.
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The authors acknowledge their affiliated institution, Indian Institute of Technology Kharagpur, West Bengal, India for providing the research facilities except Panchanan Pramanik who is now in GLA University, Mathura, UP 281406 after retirement.
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Das, B.P., Oraon, A., Nath, T.K. et al. Room temperature ferromagnetism in chemically synthesized dilute magnetic semiconducting (In0.95Mn0.05)2O3 nanoparticles. J Mater Sci: Mater Electron 31, 22872–22880 (2020). https://doi.org/10.1007/s10854-020-04814-5
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DOI: https://doi.org/10.1007/s10854-020-04814-5