Réflexion et focalisation des rayons X par les miroirs

Montel, M.

doi:10.1051/anphys/195811030859

Cited by 3 publications

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“…All of them can be attributed to the hexagonal apatite type structure (SG: P6 3 /m) and α quartz (SG: P3 2 21). Experimental a and c values are reported in Table 3 in comparison with synthetic stoichiometric [13], carbonated FAP [14], and natural carbonated FAP containing uranium [15] ones. Rietveld structure refinements are performed using the FULLPROF program.…”

Section: Resultsmentioning

confidence: 99%

<b>Chemical and structural characterization of natural phosphate of Hahotoe (Togo)</b>

Tchangbeddji

Djétéli

Kili

et al. 2004

Bull. Chem. Soc. Eth.

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Chemical and structural characterizations of natural phosphates of Hahotoe (Togo) have been performed. From chemical analysis and FTIR study, it can be concluded that the material is carbonated fluoroapatite with poor substitution of calcium by cadmium and manganese. From these results, the molecular formula proposed is: Ca 9.925 Cd 0.004 Mn 0.013 [(PO 4) 5.886 (CO 3) 0.113 ]F 2. Powder X-ray diffraction fitting results confirm that compound belongs to the apatite family crystallising in the hexagonal system, space group P6 3 /m. The cell parameters are: a = 9.3547(5) Å; c = 6.8929(4) Å.

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Section: Resultsmentioning

confidence: 99%

<b>Chemical and structural characterization of natural phosphate of Hahotoe (Togo)</b>

Tchangbeddji

Djétéli

Kili

et al. 2004

Bull. Chem. Soc. Eth.

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“…L'examen des images obtenues montre qu'en utilisant des miroirs cylindriques en verre ou en or, on obtient sur l'objet une résolution spatiale meilleure que 2 gm. A titre d'exemple, la figure 3 L'angle d'attaque (complément de l'angle d'incidence) des miroirs étant très faible (environ 10 mrd), les aberrations sont importantes et limitent rapidement le champ-objet [7]. En particulier, la forte inclinaison de l'image par rapport au rayon moyen du faisceau entraîne une diminution de la résolution lorsqu'on s'en écarte.…”

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