Recording and calculation ofhkrod intensities in case of diffraction by highly oriented powders of lamellar samples

Abstract

The aim of this paper is to describe a technique for recording the intensity distribution along definite crystallographic directions by using a classical 0,20 powder goniometer. This method was developed for application to highly oriented powders. In the calculation of simulated spectra, the partial misorientation of the particles is considered. The reflection intensities and profiles are compared for different shapes of the misorientation function N(~).

X-ray powder transmission diffractometry determination of mica polytypes: method and application to natural samples

“…These are significantly affected by absorption. The absorption of X-rays in transmission aggregates has been described by Decker et al (1948), Schultz (1948), Croche (1976), Courville et al (1977, Planqon (1980) and Planqon et al (1982). All presented an essentially equivalent formula:…”

“…Distribution of particle orientation plays an important role in petrofabric studies (Fayed, 1967), in quantitative mineralogical analysis (Taylor & Norrish, 1966;Wiewi6ra et al, 1981), and in estimating intensity distribution interferences (Ruland & Tompa, 1968;Plan~on & Tchoubar, 1977;Courville et al, 1979;Planqon, 1980, Planqon et al, 1982. It may be represented by an orientation distribution function, Ne(e), which is an expression of the fraction of particles whose (001) planes form an angle e with the flat aggregate surface.…”

Polytypism of Micas. III. X-Ray Diffraction Identification

“…(1) A transmission method that uses samples with highly oriented crystallites and axial texture as described by Plan~on et al (1982). In this method it is possible to scan along the generating rods of selected (hk) cylinders in reciprocal space.…”