International
Tables for Crystallography Volume C Mathematical, physical and chemical tables Edited by E. Prince © International Union of Crystallography 2006 |
International Tables for Crystallography (2006). Vol. C. ch. 2.4, p. 81
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The methods used in X-ray diffraction for the determination of average crystal size or size distributions may be applied to electron diffraction powder patterns. Except in the case of very small crystal dimensions, several factors peculiar to electrons should be taken into consideration.
For crystallites of regular habit, such as the small cubic crystals of MgO smoke, the ring broadening from this source is strongly dependent on the crystallographic planes involved (Sturkey & Frevel, 1945; Cowley & Rees, 1947; Honjo & Mihama, 1954). For more isometric crystal shapes, this dependence is less marked and the broadening has been estimated (Cowley & Rees, 1947) as equivalent to that due to a particle size of about 200 Å.
References
Cowley, J. M. & Rees, A. L. G. (1947). Refraction effects in electron diffraction. Proc. Phys. Soc. 59, 287–302.Google ScholarHonjo, G. & Mihama, K. (1954). Fine structure due to refraction effect in electron diffraction pattern of powder sample. J. Phys. Soc. Jpn, 9, 184–198.Google Scholar
Sturkey, L. & Frevel, L. K. (1945). Refraction effects in electron diffraction. Phys. Rev. 68, 56–57.Google Scholar