EXAFS study on the local atomic structures around Ce in CeO2 nanoparticles Article

Wu, Z, Guo, L, Li, H et al. (2000). EXAFS study on the local atomic structures around Ce in CeO2 nanoparticles . 286(1), 179-182. 10.1016/S0921-5093(00)00631-6



cited authors

  • Wu, Z; Guo, L; Li, H; Yang, Q; Li, Q; Zhu, H

fiu authors

abstract

  • CeO2 nanoparticles coated by sodium bis(2-ethylhexyl) sulfosuccinite have been prepared by using the microemulsion method. An average particle size of 2-3 nm was revealed by using transmission electron microscopy. X-ray diffraction shows that the CeO2 nanoparticles remain the CaF2-type cubic structures as the bulk crystal. Extended X-ray absorption fine structure technique is used to probe the local atomic structures around the absorber Ce. A double Gaussian model is used to deduce the structural parameters of the first coordination shell. Bulk CeO2 with eight oxygen atoms located at 2.338 Å was used as the reference sample to extract the backscattering amplitude and phase shift of the Ce-O bond. Our EXAFS data suggest that in CeO2 nanoparticles, the oxygen coordination number around Ce has no obvious decrease, but the bond-length of Ce-O is obviously elongated. It is postulated that a surface/core model may be used to describe the local atomic structures in the CeO2 nanoparticles. © 2000 Elsevier Science S.A.

publication date

  • June 30, 2000

Digital Object Identifier (DOI)

start page

  • 179

end page

  • 182

volume

  • 286

issue

  • 1