Crystal structure of whiteite-(CaFeMg) from Crosscut Creek, Canada. (Articolo in rivista)

Type
Label
  • Crystal structure of whiteite-(CaFeMg) from Crosscut Creek, Canada. (Articolo in rivista) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1524/zkri.2011.1393 (literal)
Alternative label
  • Capitelli F.*, Chita G.**, Cavallo A.***, Bellatreccia F.****, Della Ventura G. **** (2011)
    Crystal structure of whiteite-(CaFeMg) from Crosscut Creek, Canada.
    in Zeitschrift für Kristallographie
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Capitelli F.*, Chita G.**, Cavallo A.***, Bellatreccia F.****, Della Ventura G. **** (literal)
Pagina inizio
  • 731 (literal)
Pagina fine
  • 738 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 226 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • *IC-CNR, Via Salaria Km 29.300, 00015 Monterotondo (Roma), Italy **IC-CNR, Via Amendola 122/o, 70126 Bari, Italy ***INGV, Via di Vigna Murata 605, 00143 Roma, Italy ****Dipartimento di Scienze Geologiche, Università di Roma Tre, Largo Murialdo 1, 00146 Roma, Italy (literal)
Titolo
  • Crystal structure of whiteite-(CaFeMg) from Crosscut Creek, Canada. (literal)
Abstract
  • The structural characterization of whiteite-(CaFeMg), a natural orthophosphate from Crosscut Creek, Yukon, Canada, with chemical composition (Ca0.86Na0.05)?=0.91(Fe0.88Mn0.02)?=0.90Mg2.17Al1.93(PO4)4(OH)2?8H2O obtained by WDS-EMPA, was carried out by means of single crystal X-ray diffraction. The structure was solved in the P2/a monoclinic space group, with the following unit cell constants: a = 14.8700(15), b = 6.9785(5), c = 9.9268(10) Å, ? = 110.110(1)°, V = 967.31(15) Å3. Structure refinement lead to the crystal chemical formula (Ca0.95Na0.11)?=1.06Fe0.90Mg2.01Al2.05(PO4)4(OH)1.99?8.17H2O. Phosphorus atoms display tetrahedral (PO4) coordination, while magnesium, iron(II) and aluminum display regular octahedral coordination; calcium displays a complex CaO8 coordination. MgO2(H2O)4, FeO6, AlO4(OH)2, CaO8 polyhedra and PO4 groups are arranged such as to form a three-dimensional framework via edge- and vertex-sharing arrangements. Strong O-H...O hydrogen bonds contribute to stabilize the array: such interactions were also investigated by means of Libowitzky formula (Libowitzky, 1999) application, owing to the results of IR spectroscopy. (literal)
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