Journal of Materials Science

, Volume 23, Issue 4, pp 1474–1480 | Cite as

Study of the interaction of two hexagonal neodymium oxides with atmospheric CO2 and H2O

  • S. Bernal
  • F. J. Botana
  • R. García
  • J. M. Rodríguez-Izquierdo


The present work deals with the behaviour in air of two neodymia samples prepared by calcination of a hydroxynitrate phase at 1020 and 1310 K, respectively. Both oxides behave similarly so that after approximately 50 days of air exposure, at normal temperature and pressure, they are thoroughly transformed into hydroxide. When stabilization is reached the two aged samples are also carbonated in the bulk; evidence for this latter process, which is much less intense than the hydration reaction, cannot be obtained from X-ray diffraction studies. These findings indicate the existence of close analogies between the oxides investigated here and several hexagonal lanthana and monoclinic samaria samples studied earlier, which supports the classification of the rare earth oxides based on their behaviour with atmospheric CO2 and H2O, as recently proposed by us. The additional experiments of carbonation reported here suggest that the ageing in air of the hexagonal neodymium oxides leads to the formation of a hydroxycarbonate-like phase, which does not agree with the crystalline ancylite-type hydroxycarbonate, formed when these oxides are suspended in water.


Hexagonal Rare Earth Calcination Lanthana Diffraction Study 
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Copyright information

© Chapman and Hall Ltd. 1988

Authors and Affiliations

  • S. Bernal
    • 1
  • F. J. Botana
    • 1
  • R. García
    • 1
  • J. M. Rodríguez-Izquierdo
    • 1
  1. 1.Departamento de Química Inorgánica, Facultad de CienciasUniversidad de CádizCádizSpain

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