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The Dramatic Effect of Crystallite Size on X-Ray Intensities

Published online by Cambridge University Press:  06 March 2019

James P. Cline  and
Robert L. Snyder
James P. Cline
Affiliation:
N.Y.S. College of Ceramics, Alfred University, Alfred, N.Y.
Robert L. Snyder
Affiliation:
N.Y.S. College of Ceramics, Alfred University, Alfred, N.Y.
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Extract

Preferred orientation has long been considered the primary source of systematic error involved in quantitative analysis by X-ray powder diffraction. Techniques of spherical agglomeration have been shown to eliminate preferred orientation provided that the agglomerate size is made sufficiently larger than the particle size. These techniques invariably employ the surface energy minimization of a liquid phase dispersed within a second fluid to create the spherical form desired. Spray drying has been the only method to date which has been successfully used to prepare spherical agglomerates suitable for X-ray diffraction. This study was undertaken to investigate possible deleterious effects of spray drying as a diffraction sample preparation technique.

Type
III. Quantitative XRD Analysis
Information
Advances in X-Ray Analysis , Volume 26: Thirty-First Annual Conference on Applications of X-ray Analysis, August 1-6, 1982 , 1982 , pp. 111 - 117
Copyright
Copyright © International Centre for Diffraction Data 1982

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References

1. Smith, S. T., Snyder, R. L. and Brownell, W. E., “Minimization of Preferred Orientation in Powders by Spray Drying,“ Adv. X-ray Anal., 22:77 (1979),Google Scholar
2. Submitted to J. Am. Cer. Soc.Google Scholar
3. Submitted to J. Appl. Cryst.Google Scholar
4. Snyder, R. L., Hubbard, C. R. and Panagiotopoulos, H. C., “AUTO:A Real Time Diffractometer Control System,“ NBS Rept. NBSIR 81-2229, National Bureau of Standards Washington, D. C. 20234 (1981).Google Scholar
5. Snyder, R. L. and Hubbard, C. R., NBS*QUANT82, NBS Special Publication, in press (1982).Google Scholar
6. Brindley, G. W., “The Effect of Grain on Particle Size on X-ray Reflections from Mixed Powders or Alloys,”Phil. Mag. (7) 36, 347 (1945).Google Scholar