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Additional resources for Handbuch der Physik / Encyclopedia of Physics, Band / Volume XXXII: Strukturforschung / Structural Research

Example text

3) de polarisation et de a l'axe LORENTZ: LP = 1 + cos2 2 D 2sm2D . 6) pour tous les nreuds du reseau reciproque et de Ie completer par une seconde correction, relative a un facteur R dit «de rotation », specifique de la hauteur de la strate etudiee. En incidence normale: R = . 7) (q; angle du plan cristallin de n~flexion avec l'axe de rotation) fonction dont Cox et SHAWl ont dresse la liste des valeurs. t ) = sinD .. 8) Vsin2 D - sin 2 I-' dont les tables et graphiques ont ete etablis par TUNELL (1939).

Pour que les courbes ne soient pas trap accidentees, surtout par les raies faibles, on adopte des constantes de temps de l'ordre de plusieurs secondes. ), sinon Ie profil de la raie serait deforme sur l'enregistrement: elle serait elargie et son centre de gravite serait legerement deplace 3 . Avec les vitesses de rotation les plus lentes, un diagramme, meme partiel, exige done plusieurs heures. Toutefois, des diagrammes de moindre precision peuvent etre obtenus plus rapidement. Un enregistrement correct et reproductible exige que la stabilite du generateur de rayons X soit excellente.

Aussi les etudes de structure exigent, en regIe generale, d'etre faites sur un monocristal. Pourtant, au debut, de nombreuses structures tres simples ont ete determinees sur diagrammes de poudres. --0-------. dV =r'dV . 1 ) Rappelons que dans cette formule: I designe l'energie diffractee sur l'unite de longueur d'une raie DEBYE-SCHERRER enregistree a la distance r d'un volume dV de poudre assez petit pour que l'absorption y soit negligeable. I o, l'intensite par unite de surface du faisceau incident.

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