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Cristalografie de raze X - Wikipedia Sari la con?inut

Cristalografie de raze X

De la Wikipedia, enciclopedia liber?
Un difractometru de raze X

Cristalografia de raze X este o tehnic? cristalografic? utilizat? pentru determinarea structurii atomice ?i moleculare a unui cristal . La baza tehnicii se afl? ideea c? structura cristalin? cauzeaz? fascicolul incident de raze X s? se difracte in mai multe direc?ii specifice. Prin m?surarea unghiurilor ?i a intensit??ilor acestor raze difractate, se poate ob?ine o imagine tridimensional? a densit??ii electronice din cristalul respectiv. Se pot determina astfel pozi?iile atomilor in cristal, tipurile de leg?turi chimice ?i se pot deduce alte informa?ii variate. [1] Se utilizeaz? in mineralogie [2] , stiin?a materialelor [3] , cataliz? [4] [5] [6] [7] ba chiar si in istoria de arte [8] [9] [10] si arheologie [11] .

Istoric [ modificare | modificare surs? ]

Metode [ modificare | modificare surs? ]

Vezi ?i [ modificare | modificare surs? ]

Referin?e [ modificare | modificare surs? ]

  1. ^ ?Cum func?ioneaz? cristalografia cu raze X ?” , Scientia.ro , accesat in  
  2. ^ https://www.geo.arizona.edu/xtal/group/pdf/RMG78_1.pdf
  3. ^ Fontes, Marcos Alves; Scheid, Vladimir Henrique Baggio; Machado, David de Souza; Casteletti, Luiz Carlos; Nascente, Pedro Augusto de Paula ( ), ?Morphology of the DIN 100Cr6 Case Hardened Steel after Plasma Nitrocarburizing Process” , Materials Research (in englez?), 22 , pp. e20180612, doi : 10.1590/1980-5373-MR-2018-0612 , ISSN   1516-1439 , accesat in  
  4. ^ The reaction network in propane oxidation over phase-pure MoVTeNb M1 oxide catalysts. Journal of Catalysis, 311, 369-385, https://pure.mpg.de/rest/items/item_1896844_6/component/file_1896843/content
  5. ^ Surface chemistry of phase-pure M1 MoVTeNb oxide during operation in selective oxidation of propane to acrylic acid. Journal of Catalysis, 285, 48-60, https://pure.mpg.de/rest/items/item_1108560_8/component/file_1402724/content
  6. ^ Linares, Carlos F.; Bretto, Pablo ( ), ?Hydrotreating of light cycle oil over CoMo catalysts supported on niobia-alumina or niobia-silica” , Reaction Kinetics, Mechanisms and Catalysis (in englez?), 136 (2), pp. 837?849, doi : 10.1007/s11144-023-02392-1 , ISSN   1878-5204 , accesat in  
  7. ^ Liotta, L. F.; Longo, A.; Macaluso, A.; Martorana, A.; Pantaleo, G.; Venezia, A. M.; Deganello, G. ( ), ?Influence of the SMSI effect on the catalytic activity of a Pt(1%)/Ce0.6Zr0.4O2 catalyst: SAXS, XRD, XPS and TPR investigations” , Applied Catalysis B: Environmental , 48 (2), pp. 133?149, doi : 10.1016/j.apcatb.2003.10.001 , ISSN   0926-3373 , accesat in  
  8. ^ ?Behind the scenes at the museum: fine arts with X-ray vision” . www.dectris.com . Accesat in .  
  9. ^ Hiley, Craig I.; Hansford, Graeme; Eastaugh, Nicholas ( ), ?High-resolution non-invasive X-ray diffraction analysis of artists' paints” , Journal of Cultural Heritage , 53 , pp. 1?13, doi : 10.1016/j.culher.2021.10.008 , ISSN   1296-2074 , accesat in  
  10. ^ Kriznar, Anabelle (2023-09), ?Material and Technical Analysis as a Support for Art-Historical Characterization of Selected Mural Paintings in Austria around 1400” , Colorants (in englez?), 2 (3), pp. 471?486, doi : 10.3390/colorants2030022 , ISSN   2079-6447 , accesat in 21 ianuarie 2024   Verifica?i datele pentru: |date= ( ajutor )
  11. ^ Schreiner, M.; Fruhmann, B.; Jembrih-Simburger, D.; Linke, R. (2004-03), ?X-rays in art and archaeology: An overview” , Powder Diffraction (in englez?), 19 (1), pp. 3?11, doi : 10.1154/1.1649963 , ISSN   1945-7413 , accesat in 21 ianuarie 2024   Verifica?i datele pentru: |date= ( ajutor )
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