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Thermal and Mechanical Instabilities in the Alignment of Bragg-Brentano Parafocussing Powder Diffractometers

Published online by Cambridge University Press:  28 October 2013

G. Brown ,
I. G. Wood  and
L. Nicholls
G. Brown
Affiliation:
Soils and Plant Nutrition Department, Rothamsted Experimental Station, Harpenden, Hertfordshire AL5 2JQ
I. G. Wood
Affiliation:
Soils and Plant Nutrition Department, Rothamsted Experimental Station, Harpenden, Hertfordshire AL5 2JQ
L. Nicholls
Affiliation:
Soils and Plant Nutrition Department, Rothamsted Experimental Station, Harpenden, Hertfordshire AL5 2JQ
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Abstract

Using a standard laboratory X-ray powder diffractometer under very stable environmental conditions, it has been found that measurements of the positions and heights of sharp diffraction maxima can be made with a precision of order 2 × 10 −4° in 2θ and 0.1% in height (for ∼ 2 × 105 counts per point at the peak). Under normal conditions, however, displacements of order 0.02° in 2θ and 3% in height are observed. These shifts have been attributed to changes in the diffraction geometry, in particular the sourcedivergence slit configuration, brought about by changes in ambient temperature and by changes in the temperature of the liquid used to cool the X-ray tube.

Type
Research Article
Information
Powder Diffraction , Volume 2 , Issue 1 , March 1987 , pp. 7 - 21
Copyright
Copyright © Cambridge University Press 1987

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References

International Tables for X-ray Crystallography (1968), III, Birmingham, Eng.: Kynoch Press.Google Scholar
Klug, H. P. and Alexander, L. E. (1974) “X-ray Diffraction Procedures for Polycrystalline and Amorphous Materials” New York, Wiley.Google Scholar
Schreiner, W. N. (1986) Powder Diffraction 1, No. 1, 26–33.CrossRefGoogle Scholar
Wilson, A. J. C. (1963) “Mathematical Theory of X-ray Powder Diffraction” Einhoven: Centrex.Google Scholar