Magnetic and Fluorescence Properties of Cerium-doped Yttrium Aluminum Iron Garnet Nanocrystals

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  • Aoki D.
    Department of Materials Science and Technology, Gifu University
  • Shima M.
    Department of Materials Science and Technology, Gifu University

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  Magnetic and fluorescence properties of Ce:YAIG (CeyY3-yAl5-xFexO12) nanocrystals synthesized by co-precipitation and annealed at 1273 K for 4 hours have been investigated. The structural characterization by X-ray diffraction shows that the samples with 0 ≤ x ≤ 5.0 and 0 ≤ y ≤ 0.2 are in the garnet phase. With increasing x from 0 to 5.0 while y maintained at 0.06, ｔhe lattice constant gradually increases from 12.04 nm to 12.40 nm. When y is increased with x fixed at 3.0, only garnet peaks are observed for 0 ≤ y ≤ 0.15, while CeO2 appears to be present besides the garnet when 0.15 ≤ y ≤ 0.2. The saturation magnetization of Ce:YAIG is found to increase from 2.21 emu/g for y = 0 to 4.35 emu/g for y = 0.06 at x = 3.0. With increasing x from 0 to 3.0 at y=0.06, the fluorescent peak observed at ～520 nm gradually diminishes, indicating that the fluorescence of Ce:YAIG is not only dependent on the presence of Ce3+ at the dodecahedral sites but also sensitively on the ratio of Al3+ to Fe3+ at the octahedral and tetrahedral sites in the garnet.

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