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Date
1974
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Abstract
The local atomic arrangement of amorphous aluminum oxide is clarified by an electron diffraction study of anodic film formed in an aluminum-lead cell with a boric acid electrolyte. Diffraction patterns were produced in a Philips EM 300 electron microscope, tracings were made on a Joyce-Loebl densitometer and calibrated by the method of Karle and Karle. A reduced radial distribution and a radial distribution curve were prepared and partially interpreted by methods used by Vainshtein and also by Warren in X-rays. Ninety-two per cent of the aluminum atoms were found to be in tetrahedral configuration at 1.75Å separation distance and 8% in octahedral configuration at 1.85Å. Al-Al separations occur at 2.75Å and O-O separations at 3.20Å. The results agree qualitatively with a previous X-ray study by B. Burzlaff. In the present study more distant neighbor peaks were resolved although a complete model was not constructed. This study is the first application of radial distribution analysis of electron diffraction data to light atom structures containing two kinds of coordination polyhedra.
Contents
Subject
Subject(s)
Electrons--Diffraction
Metallic oxides
Metallic oxides
Research Projects
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Genre
Dissertation
Description
Format
x, 198 leaves, bound : illustrations
Department
Physics and Astronomy