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

被引：9

作者：

Angeles-Chavez, C. ^{[1
]}

Salas, P. ^{[2
]}

Diaz-Torres, L. A. ^{[3
]}

de la Rosa, E. ^{[3
]}

Esparza, R. ^{[4
]}

Perez, R. ^{[4
]}

机构：

[1] Inst Mexicano Petr, Programa Ingn Mol, Mexico City 07730, DF, Mexico

[2] Univ Nacl Autonoma Mexico, Ctr Fis Aplicada & Tecnol Avanzada, Queretaro 76000, Mexico

[3] Ctr Invest Opt, Leon 37150, Mexico

[4] Univ Nacl Autonoma Mexico, Inst Ciencias Fis, Cuernavaca 62210, Morelos, Mexico

来源：

MICROSCOPY AND MICROANALYSIS | 2009年 / 15卷 / 01期

关键词：

ZrO2; Yb; nanophosphor; HAADF-STEM; STEM-EDXS; HRTEM; TRANSMISSION ELECTRON-MICROSCOPY; UP-CONVERSION EMISSION; X-RAY-DIFFRACTION; MU-M; NANOCRYSTALS; ZIRCONIA; LUMINESCENCE; ENHANCEMENT; CRYSTALS; ATOMS;

D O I：

10.1017/S1431927609090047

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 degrees 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.

引用

页码：46 / 53

页数：8

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