Local Atomic Structure and Amorphization of Tungsten Doped Ceria/Titania
Structural and chemical changes in tungsten doped CeTiO
x
, were investigated in terms of tungsten doping site, amorphization, and valence state of cerium. After doping tungsten to CeTiO
x
, tungsten ions were identified to be in the interstitial sites
of precipitated ceria nano-particles and form amorphous phase, through extended X-ray absorption fine structure analysis. Ceria (111) planes were repeatedly observed in CeTiO
x
and the number of lattices dramatically decreased at the molar ratio of Ce:W = 1:1. A large amount
of ionic-radius differences between cerium and tungsten led to the lattice expansion of the precipitated ceria (111) by about 6%, resulting in the amorphization.
Keywords: Interstitial Tungsten; Lattice Expansion; Local Atomic Structure; Thermal Stability; Valence State
Document Type: Research Article
Affiliations: 1: Department of Materials Science and Engineering, Pusan National University, Busan 46241, Korea 2:
Publication date: 01 May 2018
- Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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