Open AccessAMORPHOUS AND NANOCRYSTALLINE ZrO2·Y2O3(15%) STUDIED BY EXTENDED X-RAY ABSORPTION FINE STRUCTURE
Author(s) -
Zeming Qi,
SHI CHAO-SHU,
Wen-Chen Zheng,
Wei Ya-Guang,
Xie Yaning,
Hu Tian-Dou,
LI FU-LI
Publication year - 2001
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.50.1318
Subject(s) - nanocrystalline material , extended x ray absorption fine structure , amorphous solid , materials science , coordination number , crystallography , grain size , bond length , x ray absorption fine structure , absorption (acoustics) , crystal structure , cubic zirconia , absorption spectroscopy , nanotechnology , metallurgy , ion , optics , composite material , ceramic , spectroscopy , chemistry , physics , organic chemistry , quantum mechanics
Chemical coprecipitated amorphous and nanocrystalline ZrO2·Y2O3(15%) was studied by Powder X-ray diffraction(XRD) and extended X-ray absorption fine structure(EXAFS). XRD result shows that the sample is an amorphous phase annealed below 300℃; and it crystallizes into cubic nanocrystalline zirconia at 500℃. EXAFS analysis indicates that the coordination number and bond length of Zr-O shell has not changed when transforming from amorphous into nanocrystalline. This suggests that at 300℃,it has formed the same nearest-neighbor local structure as at 900℃. For Zr-Zr(Y) shell, with the reducing of grain size, the coordination number decreases obviously: the bond length is shorter and the disorder becomes larger. This result suggests that the grain size effect is much stronger for more distant coordination shell (Zr-Zr ) than for the first nearest-neighbor shell(Zr-O).