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One-Dimensional Fourier Synthesis In Clay Analysis


The one-dimensional Fourier synthesis from the basal reflections of clays was an important method for the verification of the suggested clay structure by Hofmann (1933). The Fourier synthesis simulates the distribution of electrons and therefor the positions of atoms in the actual layer structure and in the interlayer space of clay minerals. The pioneer works about montmorillonite, vermiculite, mica and chlorite showed excellent results which were mostly calculated by hand. To carry out best results with the Fourier synthesis two basic conditions are required. Firstly a large number of ( 00l ) reflections are needed and secondly the calculated intensities must be compatible with XRD pattern. The large number of basal reflections determine the resolution of the atom positions in the unit cell and can only be achieved with single crystals or careful prepared high oriented smear slides. In our study, intercalation of propanediol shows more then twelve orders of integral basal reflections for different kind of clays. With a common PC and our new Windows program the calculation of the position of atoms is easily accessible. 11th International Clay Conference, Ottawa, 1997


Kahr, Günter and Dick, S. and Nüesch, Rolf

Index Terms:

Clay; ClayGroup

Further Information:

Date published: 1997