TERMIUM Plus^®

Fiche 1,  Justifications,  Anglais

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Analysis of the crystal structure of materials by passing X-rays through them and registering the diffraction (scattering) image of the rays.  4, fiche 1, Anglais, - X%2Dray%20diffraction%20analysis

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Qualitative X-ray diffraction(XRD) analysis is used to identify minerals based on their crystal structure. We provide standard XRD analysis as well as clay XRD analysis, which involves processing the sample to produce diagnostic changes in clay XRD peak positions and sizes.  5, fiche 1, Anglais, - X%2Dray%20diffraction%20analysis

Record number: 1, Textual support number: 1 OBS

X-ray diffraction analysis: term used at Natural Resources Canada - Earth Sciences Sector.  6, fiche 1, Anglais, - X%2Dray%20diffraction%20analysis

Fiche 1,  Justifications,  Français

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Technique d'analyse basée sur la diffraction des rayons X sur la matière.  2, fiche 1, Français, - diffractom%C3%A9trie%20de%20rayons%20X

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L'analyse par diffraction des rayons X est l'une des méthodes les plus utilisées pour identifier les minéraux. Elle est surtout utilisée pour l'identification des minéraux argileux, en raison de leur taille se situant en dessous 0,1 micron. La méthode est basée sur la loi de Bragg utilisant les distances interatomiques de chaque minéral analysé. Le diffractogramme en est la représentation graphique.  3, fiche 1, Français, - diffractom%C3%A9trie%20de%20rayons%20X

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Analyse par diffraction X. L'analyse par diffraction des rayons X ou diffractométrie X permet de déterminer les distances interatomiques et l'arrangement des atomes dans les réseaux cristallins. Comme les rayons X sont diffractés de façon différente par les éléments du réseau suivant la construction de ce dernier, l'irradiation de la matière par rayons X permet de connaître sa nature cristallographique.  4, fiche 1, Français, - diffractom%C3%A9trie%20de%20rayons%20X

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Une telle hétérogénéité minéralogique ne peut être mise en évidence que par une analyse DRX; elle est, par ailleurs, fonction de l'appartenance stratigraphique des couches argileuses.  6, fiche 1, Français, - diffractom%C3%A9trie%20de%20rayons%20X

Record number: 1, Textual support number: 1 OBS

diffractométrie de rayons X; diffractométrie X : termes en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.  8, fiche 1, Français, - diffractom%C3%A9trie%20de%20rayons%20X

Fiche 1,  Justifications,  Espagnol

Fiche 2,  Justifications,  Anglais

Record number: 2, Textual support number: 1 CONT

X-ray powder diffraction is used in the identification of crystalline phases in unknown samples, finding the lattice parameter and other lattice related information, quantitative determination of phases in multiphase samples, finding the orientation in single crystals, and stereographic projections. The samples must be crystalline solids such as metals, ceramics, rocks etc. These samples are usually about 1 mg in size. If the sample fits in the sample holder then there is no preparation necessary otherwise the sample may have to be crushed in order to fit. The sample takes less than one hour to be analyzed for qualitative analysis in major phases and up to 16 hours for trace phases. The quantitative analysis can take several minutes to several hours after set up. There are several detectors used in XRPD varying from films to cameras to diffractometers.  1, fiche 2, Anglais, - x%2Dray%20powder%20diffraction

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Powder X-Ray Diffraction. Powders of crystalline materials diffract X-Rays. A beam of X-rays passing through a sample of randomly-oriented micro-crystals produces a pattern of rings on a distant screen. Powder X-Ray diffraction provides less information than single-crystal diffraction, however, it is much simpler and faster. Powder X-Ray diffraction is useful for confirming the identity of a solid material and determining crystallinity and phase purity. Modern powder X-Ray diffractometers consist of an X-Ray source, a movable sample platform, an X-Ray detector, and associated computer-controlled electronics. The sample is either packed into a shallow cup-shaped holder or deposited as a slurry onto a quartz substrate, and the sample holder spins slowly during the experiment to reduce sample heating. The X-Ray source is usually the same as used in single-crystal diffractometers, Mo or Cu. The X-Ray beam is fixed and the sample platform rotates with respect to the beam by an angle theta. The detector rotates at twice the rate of the sample and is at an angle of 2 theta with respect to the incoming X-Ray beam.  4, fiche 2, Anglais, - x%2Dray%20powder%20diffraction

Record number: 2, Textual support number: 3 CONT

Fine particles such as clays must be separated from larger particles and measured separately if they are to be detected properly. To reduce errors associated with preferred orientation of minerals, samples are most commonly ground to a powder before analysis, a technique known as powder X-ray diffraction.  4, fiche 2, Anglais, - x%2Dray%20powder%20diffraction

Record number: 2, Textual support number: 4 CONT

X-ray powder diffraction(XRD) is a direct method for qualitative and quantitative characterization of fine-grained materials such as clinker and cement, and may also be used for analysis of raw materials. Each phase produces a unique diffraction pattern independent of others, with the intensity of each pattern proportional to that phases concentration in a mixture.  5, fiche 2, Anglais, - x%2Dray%20powder%20diffraction

Fiche 2,  Justifications,  Français

Record number: 2, Textual support number: 1 CONT

Diffraction de rayons sur poudres : analyse quantitative de composés modèles du ciment anhydre. [...] Ce stage sera consacré à la caractérisation par diffraction des rayons X de mélanges d'alites de synthèse M1 et M3. La méthode expérimentale utilisée sera la diffraction des rayons X sur poudres jointe aux autres méthodes de laboratoire associées.  1, fiche 2, Français, - diffraction%20de%20rayons%20X%20sur%20poudres

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À l'aide de la diffraction de rayons X de poudres, différentes formes polymorphiques peuvent être détectées pour des molécules à activité pharmacologique.  2, fiche 2, Français, - diffraction%20de%20rayons%20X%20sur%20poudres

Fiche 2,  Justifications,  Espagnol