Hostname: page-component-77c89778f8-5wvtr Total loading time: 0 Render date: 2024-07-18T12:19:50.337Z Has data issue: false hasContentIssue false
  • English
  • Français

The Influence of Crystallite Size on the Apparent Basal Spacings of Kaolinite

Published online by Cambridge University Press:  01 July 2024

Volkmar Trunz
Volkmar Trunz*
Affiliation:
Mineralogisch-Kristallographisches Institut der Technischen Universität, 3392 Clausthal-Zellerfeld, Säigemüllerstr. 4 West Germany
Get access Rights & Permissions [Opens in a new window]

Abstract

For very small crystallites diffraction theory shows not only broadening of powder lines, but generally also a shift of the line position, depending on the change of the structure factor over the range of broadening. For decreasing thickness of kaolinite crystals (less than 50 layers) an increasing shift of reflections is found: the lines (001), (002), (004) and (006) are shifted to apparently larger spacings, the lines (003) and (005) to smaller spacings, resulting in a nonintegral series. Presuming a known crystallite size, tables are given for evaluating true spacings from measured values of 2θ.

Type
Research Article
Information
Clays and Clay Minerals , Volume 24 , Issue 2 , April 1976 , pp. 84 - 87
Copyright
Copyright © 1976 The Clay Minerals Society

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Brindley, G. W. and Robinson, K. (1946) The structure of kaolinite: Miner. Mag. 27, 242–253.Google Scholar
Cromer, D. T. and Mann, J. B. (1968) X-ray scattering factors computed from numerical Hartree-Fock wave-functions: Acta Cryst. A 24, 321–324.10.1107/S0567739468000550CrossRefGoogle Scholar
Dric, V. A. and Kašaev, A. A. (1960) An X-ray study of a single crystal of kaolinite: Soviet Physics—Crystallography 5, 207–210.Google Scholar
Edwards, H. J. and Langford, J. I. (1971) A comparison between the variances of the CuKα and FeKα spectral distributions: J. Appl. Cryst. 4, 43–50.CrossRefGoogle Scholar
Güven, N. (1974a) Factors affecting selected area electron diffraction patterns of micas: Clays & Clay Minerals 22, 97–106.CrossRefGoogle Scholar
Güven, N. (1974b) Exact evaluation of the “interference function”: Acta Cryst. A 30, 681.CrossRefGoogle Scholar
Reynolds, R. C. (1968) The effect of particle-size on apparent lattice spacings: Acta Cryst. A 24, 319–320.CrossRefGoogle Scholar
Ross, M. (1968) X-ray diffraction effects by non-ideal crystals of biotite, muscovite, montmorillonite, mixed-layer-clays, graphite and periclase: Z. Krist. 126, 80–97.CrossRefGoogle Scholar
Taylor, J., Mack, M. and Parrish, W. (1964) Evaluation of truncation methods for accurate centroid lattice-parameter determination: Acta Cryst. 17, 1229–1245.CrossRefGoogle Scholar
Tettenhorst, R. and Roberson, H. E. (1972) X-ray diffraction aspects of montmorillonite: Am. Miner. 58, 73–80.Google Scholar
Trunz, V. (1974) Untersuchungen zu Fehlordnungsers-cheinungen des Kaolinits—eine röntgenographische Linienprofilanalyse mithilfe der Varianz-Methode: Dissertation, Clausthal.Google Scholar
Wilson, A. J. C. (1963) X-ray-powder Diffractometry—Mathematical Theory: Philips, Eindhoven.Google Scholar
Zvjagin, B. B. (1960) Electron-diffraction determination of the structure of kaolinite: Soviet Physics—Crystallography 5, 32–42.Google Scholar