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    題名: Valence state of CeAl2 nanoparticles studied by Ce L3-edge x-ray absorption spectroscopy
    作者: Chang, C. L.;Dong, C. L.;Huang, C. L.;Chen, Y. Y.
    貢獻者: 淡江大學物理學系
    日期: 2000-04
    上傳時間: 2009-12-31 10:19:42 (UTC+8)
    出版者: College Park: American Institute of Physics (AIP)
    摘要: We report measurements of the Ce L3-edge x-ray absorption near-edge structure on CeAl2 nanoparticles with average diameters of 80 Å. The Ce exhibits a mixed valence with a small amount of tetravalent Ce, which is in contrast to the purely trivalent Ce observed in bulk CeAl2. A shift in the absorption edge to higher energy and a narrower linewidth are also observed in the nanoparticle samples. These spectral differences are attributed to surface effects caused by the small particle size, including a lower coordination number and higher surface pressure. The observation of nonmagnetic tetravalent Ce with the 4f0 configuration is in good agreement with the small values of magnetic entropy seen in low temperature specific heat measurements. © 2000 American Institute of Physics.
    關聯: Journal of Applied Physics 87(7), pp.3349-3350
    DOI: 10.1063/1.372347
    顯示於類別:[物理學系暨研究所] 期刊論文

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