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Thermally induced phase transition and magnetic properties of Fe– F e S i 2 with core–shell structure
Author(s) -
Li Miao,
Chen Xiao,
Guan Jingchao,
Wang Junhu,
Liang Changhai
Publication year - 2013
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201330076
Subject(s) - materials science , annealing (glass) , transmission electron microscopy , silicide , silicon , ferromagnetism , mössbauer spectroscopy , magnetization , nanoparticle , diffraction , metal , stoichiometry , analytical chemistry (journal) , chemical engineering , crystallography , nanotechnology , metallurgy , condensed matter physics , chemistry , magnetic field , optics , physics , engineering , quantum mechanics , chromatography
Metal silicides are complicated materials due to the complex phase behavior between metals and silicon and the complex stoichiometries and structures of their resulting compounds. Iron silicide nanoparticles with various phases have been successfully controlled and synthesized via thermal annealing of a core–shell structure Fe–FeSi 2 sample at atmospheric pressure under Ar and H 2 atmospheres. The results from X‐ray diffraction, transmission electron microscopy, and Mössbauer spectroscopy indicated that the crystal transformation proceeded from Fe–FeSi 2 to FeSi and Fe 3 Si with increasing the annealing time and temperature. The samples presented ferromagnetic properties, and the saturation magnetization changed with the annealing temperature due to the aggregation of the nanoparticles. This thermal annealing method can also be applied to the synthesis of other metal silicides with different metal/silicon ratios that are otherwise difficult to synthesize.