Stabilization of Carbonate Hydroxyapatite by Isomorphic Substitutions of Sodium for Calcium (Articolo in rivista)

Type
Label
  • Stabilization of Carbonate Hydroxyapatite by Isomorphic Substitutions of Sodium for Calcium (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Alternative label
  • Barinov S.M., Fadeeva I.V., Ferro D., Rau J.V., Nunziante Cesaro S., Komlev V.S., Fomin A.S. (2008)
    Stabilization of Carbonate Hydroxyapatite by Isomorphic Substitutions of Sodium for Calcium
    in Russian Journal of Inorganic Chemistry
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Barinov S.M., Fadeeva I.V., Ferro D., Rau J.V., Nunziante Cesaro S., Komlev V.S., Fomin A.S. (literal)
Pagina inizio
  • 164 (literal)
Pagina fine
  • 168 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 53 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • http://dx.doi.org/10.1134/S0036023608020022 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Institute of Physicochemical Problems of Ceramic Materials, Russian Academy of Sciences, Ozernaya ul. 48, Moscow, 119361 Russia Institute for Nanostructured Materials Research, National Research Council, Aldo Moro Sq., 5, Rome, 00185 Italy (literal)
Titolo
  • Stabilization of Carbonate Hydroxyapatite by Isomorphic Substitutions of Sodium for Calcium (literal)
Abstract
  • Carbonate hydroxyapatite (CHA) is an analogue of the mineral component of bone tissue. Synthetic CHA is thermally unstable: it readily decomposes with carbon oxide evolution when sintered to ceramics. Its thermal stability has been studied as affected by partial isomorphic substitution of sodium for calcium intended to compensate a possible charge imbalance induced by CO32- groups. Investigative tools were thermogravimetry and FTIR spectroscopy of the condensed vapor produced by heating CHA samples doped with 0.4 and 0.8wt % sodium. Sodium does not improve the thermal stability of CHA: weight loss on heating increases with increasing sodium level; evolution of carbon oxides occurs at lower temperatures and more intensively. Sodium enhances the generation of B-type defects (CO32- -> PO32- substitutions); these defects are thermodynamically less stable than AB-type defects (CO32- -> PO32-,OH- substitutions), which are characteristic of sodium-free CHA. (literal)
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