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Start Over Author "Wang, Jun-Qiao" Publisher elsevier bv
18 results on '"Wang, Jun-Qiao"'

9. Structure imperfection of γ-Al2O3

Author

Li Han, Chen Ji-Zhou, and Wang Jun-Qiao

Subjects
Diffraction, Condensed matter physics, Isotropy, chemistry.chemical_element, Crystal structure, Inorganic Chemistry, Crystallography, chemistry, Aluminium, Materials Chemistry, Crystallite, Physical and Theoretical Chemistry, Anisotropy, Line (formation), Stacking fault
Abstract

The X-ray diffraction pattern of γ-Al 2 O 3 is found to be broadened with every diffraction line being different. This is attributed to the difference of regularity of oxygen ions and aluminium ions. In order to study the structural information shown by this selected broadening, the peak separation processing for the γ-Al 2 O 3 X-ray diffraction pattern has been carried out. It is found that the lattice distortion of γ-Al 2 O 3 can be neglected and the γ-Al 2 O 3 crystallite size is approximately isotropic. Therefore it might be deduced that the selective widening of the diffraction line does not come mainly from the anisotropy of the crystallite shape. According to our result that the diffraction line width with low index (220) is wider than that with high index (440) the selective widening of the diffraction line might come mainly from the structure defect. This implies the possibility of the existence of the stacking fault in the γ-Al 2 O 3 structure and it might be concluded that the diffraction line widening of the γ-Al 2 O 3 caused by the stacking fault leads to the crystalline structure imperfection.

Published
1995

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