Magnetic and fluorescence properties of cerium-doped yttrium gadolinium aluminum iron garnet crystals
Magnetic and fluorescence properties of cerium-doped yttrium gadolinium aluminum iron garnet crystals
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DOI：
10.7567/jjap.53.113001
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发表时间：
2014-10
影响因子：
1.5
通讯作者：
D. Aoki;M. Shima
中科院分区：
文献类型：
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作者：
D. Aoki;M. Shima
研究了化学合成Ce：Gd-YAIG（Ce0.05GdxY2.95− xAl 5 − yFeyO 12）纳米晶的磁性和荧光性质。X射线衍射（XRD）分析表明，在0 ≤ x ≤ 2.95，0 ≤ y ≤ 3.0的样品中，存在石榴石相。当y = 0时，对于0 ≤ x ≤ 2.5，仅观察到石榴石峰，而对于x > 2.5，石榴石和钙钛矿相都存在。XRD Rietveld分析表明，Fe ~（3+）在石榴石四面体和八面体中的占位率与Ce ~（3+）和Gd ~（3+）在十二面体中对Y ~（3+）的取代量无关。当x = 0和y = 3.0时，样品的饱和磁化强度为4.35emu/g，而当x = 2.5和y = 3.0时，样品的饱和磁化强度为87.5emu/g。当Fe 3+组成y在x = 2.5时从0变化到3.0时，在发射波长λ 570 nm处的荧光强度显著降低，推测是由于晶体中增加的Fe 3+的吸收。
Magnetic and fluorescence properties of chemically synthesized Ce:Gd-YAIG (Ce0.05GdxY2.95−xAl5−yFeyO12) nanocrystals have been investigated. The structural characterization by X-ray diffraction (XRD) shows that a garnet phase has been identified in samples with 0 ≤ x ≤ 2.95 and 0 ≤ y ≤ 3.0. When y = 0, only garnet peaks are observed for 0 ≤ x ≤ 2.5, while both garnet and perovskite phases are present for x > 2.5. It is found from XRD Rietveld analyses that the site occupancy of Fe3+ at the tetrahedral and octahedral sites in the garnet is independent of the amount of Y3+ substituted by Ce3+ and Gd3+ at the dodecahedral sites. The saturation magnetization for the sample with x = 0 and y = 3.0 is 4.35 emu/g, while that with x = 2.5 and y = 3.0 is 87.5 emu/g. When the Fe3+ composition y is varied from 0 to 3.0 at x = 2.5, the intensity of fluorescence at the emission wavelength ∼570 nm significantly decreases presumably due to absorption by Fe3+ that is increased in the crystal.