Structural and Chemical Characterization of Yb2O3-ZrO2 System by HAADF-STEM and HRTEM

ZrO2:Yb3+ nanocrystalline phosphors with high concentrations of ytterbium ions were prepared using the sol-gel method. X-ray diffraction, high-angle annular-dark-field scanning transmission electron microscopy (HAADF-STEM), energy dispersive X-ray spectroscopy, and high-resolution transmission elect...

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Bibliographic Details
Published in:Microscopy and microanalysis 2009-02, Vol.15 (1), p.46-53
Main Authors: Angeles-Chavez, C., Salas, P., Díaz-Torres, L.A., de la Rosa, E., Esparza, R., Perez, R.
Format: Article
Language:English
Subjects:
Chemicals
Crystallography
Electron microscopes
Ions
X-ray diffraction
X-ray spectroscopy
Ytterbium
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Summary:ZrO2:Yb3+ nanocrystalline phosphors with high concentrations of ytterbium ions were prepared using the sol-gel method. X-ray diffraction, high-angle annular-dark-field scanning transmission electron microscopy (HAADF-STEM), energy dispersive X-ray spectroscopy, and high-resolution transmission electron microscopy (HRTEM) were used to characterize the nanocrystalline phosphors annealed at 1000°C. Unit-cell distortion and changes in the crystalline structure of the monoclinic zirconia to tetragonal zirconia, and subsequently cubic zirconia, were observed with increased Yb concentration. Yb ions were randomly distributed into the lattice of the crystalline structure. No segregation of Yb2O3 phase was observed. The substitution of Zr atoms by Yb atoms on different crystalline phases was confirmed by the experimental results and theoretical simulations of HRTEM and HAADF-STEM.
ISSN:1431-9276
1435-8115
DOI:10.1017/S1431927609090047