A misunderstood member of the nagelschmidtite family: structure of Ca5Na2(PO4)4 from x-ray powder diffraction (Articolo in rivista)

Type
Label
  • A misunderstood member of the nagelschmidtite family: structure of Ca5Na2(PO4)4 from x-ray powder diffraction (Articolo in rivista) (literal)
Anno
  • 2003-01-01T00:00:00+01:00 (literal)
Alternative label
  • Celotti G., Landi E. (2003)
    A misunderstood member of the nagelschmidtite family: structure of Ca5Na2(PO4)4 from x-ray powder diffraction
    in Journal of the European Ceramic Society
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Celotti G., Landi E. (literal)
Pagina inizio
  • 851 (literal)
Pagina fine
  • 858 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 23 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Titolo
  • A misunderstood member of the nagelschmidtite family: structure of Ca5Na2(PO4)4 from x-ray powder diffraction (literal)
Abstract
  • During the procedures to synthesize carbonate hydroxyapatite closely resembling biological one, a new phase was found to form after high temperature treatments in the presence of sodium. Such a compound was isolated and analytically characterized, leading to Ca5Na2(PO4)4 composition: an analogous Ca-Na phosphate was previously described, but with rather poor diffraction data and uncertain stoichiometry. Accurate XRD powder pattern yielded a hexagonal cell, space group P63mc (186), a=10.64 Å, c=21.71 Å, Z=6, r=2.93 g/cm3, with a double and c triple in respect to the subcell typical of a-phases of the well-known system A2XO4 (or ABXO4). The complete structural determination was carried out and the relevant aspects and properties discussed. (literal)
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