Computer Program for Analysing Interstratified Structures by Fourier Transform Methods

Abstract

A computer program for analysing two-component interstratified structures by two different Fourier transform methods is described. The first method consists of the calculation of the X-ray diffraction intensity function, and in the second one (direct method) the distribution function of interlayer distances is calculated. The programs have been written in compiled GWBASIC for an Olivetti M-24 microcomputer (MS-DOS operating system), and they may also be run on any IBM compatible personal computer. As an example, this program is applied for the analysis of a chlorite-smectite interstratified mineral.

Interaction of aminotriazole with montmorillonite and Mg-vermiculite at pH 4

“…A computer program, based on Fourier transform methods (Vila & Ruiz-Amil, 1988), was applied to the results obtained from XRD analysis, in order to establish whether the basal spacing obtained corresponded to an interstratified structure or a pure phase (segregated phase). This program has previously been applied to different systems in which the formation of a clay mineral-organic compound complex was studied (Aragrn et al, 1992).…”

Stability of n-Butylammonium Vermiculite in Powder and Flake Forms

“…The interstratified phases were studied using the IN-TER program (Vila and Ruiz-Amil 1988). The program allows the calculation of diffraction effects from given mixtures (XRD intensity function) and compares them with experimentally recorded diffraction curves (Ruiz-Amil et al 1967;Vila and Ruiz-Amil 1988;Ruiz-Amil et al 1992).…”

Interaction of Vermiculite with Aliphatic Amides (Formamide, Acetamide and Propionamide): Formation and Study of Interstratified Phases in the Transformation of Mg- to NH4-Vermiculite

“…The interstratified phases were studied using the IN-TER program (Vila and Ruiz-Amil 1988). The program allows diffraction effects to be calculated from given mixtures (XRD Intensity Function) and compared with experimentally recorded diffraction curves.…”

“…where: a is a constant proportionality factor; Is and ds are the intensity and spacings of X-ray reflections; | is the angular factor representing the combined Lorentz-polarization and geometrical factors, which depends upon the experimental technique (Vila and Ruiz-Amil 1988); and Fs is the structure factor for the mixed layer.…”

“…According to MacEwan et al (1961) and Vila and Ruiz-Amil (1988), the structure factor used for the mixed layers is: ~" LOI = Loss on ignition (weight loss after heating at 1000 ~ during 1 h). Table 2.…”