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A Precise Determination of the Atomic Position Parameter for α-Uranium*

Published online by Cambridge University Press:  06 March 2019

Edward F. Sturcken  and
Ben Post
Edward F. Sturcken
Affiliation:
E. I. du Pont de Nemours & Co., Aiken, South Carolina
Ben Post
Affiliation:
Polytechnic Institute of Brooklyn, Brooklyn, New York
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Abstract

The new value determined for the parameter was y= 0.1025 ± 0.0003 compared to a previous value of y= 0.105 ± 0.005 deduced by Jacob and Warren. The absorption errors and preferred orientation effects were eliminated and the statistical precision of the measurements was increased by employing a single-crystal diffractometrlc technique.

The cell dimensions were also refined by using the diffractometric technique for high-purity annealed polycrystalllne uranium. Cell dimensions were ao= 2.854 A, bo=5.869 A, and co=4.955 A, all ±0.002 A. Interatomic distances of the twelve nearest neighbors were two atoms at 2.754 and 2.854 A andfour atoms at 3,263 and 3,342 A. The bond lengths were only slightly affected by the changes in y. The main effects of the new parameter are to alter the component of the bond along the b direction by 0.015 A and to change appreciably the calculated relative diffraction intensities.

Type
Research Article
Information
Advances in X-Ray Analysis , Volume 4: Ninth Annual Conference on Applications of X-ray Analysis, August 10-12, 1960 , 1960 , pp. 85 - 92
Copyright
Copyright © International Centre for Diffraction Data 1960

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Footnotes

*

The information contained in this article was developed during the course of work under contract AT(07-2)-1 with the U. S. Atomic Energy Commission.

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