Phénomène de défocalisation lié à la géométrie de la chambre de texture de Schulz et incidence sur l'intensité mesurée

The Schulz reflexion method used to draw the {hkl} pole figures of a sample having one or several textures does not allow the definition of the outer part of these figures since the diffracted beam defocuses at low values of the tilt angle, φ. Relationships are established to correct the recorded diffracted intensity so that the outer part of pole figures can be outlined. The defocusing effects of the various slits are surveyed and correction curves are presented. The intensity diffracted by a theoretical isotropic sample (rather difficult to get in practice) is calculated from diagrams recorded on a textured specimen. A quantitative analysis of the results obtained on various samples and a detailed study of the texture evolution become possible. An example is given for a rolled OFHC copper sample.