期刊
HYPERFINE INTERACTIONS
卷 208, 期 1-3, 页码 65-69出版社
SPRINGER INTERNATIONAL PUBLISHING AG
DOI: 10.1007/s10751-011-0503-5
关键词
Dilute magnetism; Fe doping; Amorphous and crystalline aluminium oxide; Mossbauer spectra; Nano-materials
Aluminium oxides doped with 1% Fe-57 were prepared by sol-gel method, and annealed for 3 hours at various temperatures between 550 degrees C and 1100 degrees C. Amorphous phases were obtained below 1000 degrees C, and crystalline alpha-Al2O3 was formed at 1100 degrees C. Although Al2O3 itself shows diamagnetism, the light doping of Fe ions into aluminium oxide induced a very weak ferromagnetism, but the ferromagnetism disappeared by longer annealing. Mossbauer spectra were composed of paramagnetic Fe2+ and Fe3+ species for samples heated below 750 degrees C, and of paramagnetic Fe3+ above 850 degrees C, in addition to a magnetic sextet and relaxation peaks of Fe3+. The magnetic and quadrupole interactions of the sextet and the relaxation peaks and the density functional calculations suggest that the lightly doped Fe3+ ions are substituted at Al sites in the Al2O3 lattice.
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