Journal of Materials Science

, Volume 20, Issue 9, pp 3219–3229 | Cite as

Reaction of polycrystalline Na β″ -alumina with CO2 and H2O and the formation of hydroxyl groups

  • J. B. Bates
  • D. Dohy
  • R. L. Anderson


The reactions of polycrystalline Na β″-alumina with CO2 and H2O were investigated using infrared reflectance methods. These reactions result in the replacement of Na+ ions with H3O+ ions and the formation of a scale of NaHCO3 or hydrated Na2CO3 on the surfaces of ceramic specimens. The composition of the scale formed depends on the pressures of CO2 and H2O: NaHCO3 forms at high CO2 pressure while Na2CO3 · XH2O forms at low CO2 pressures. The H3O+ ions dislocate by an endothermic process to produce OH species in the conduction layers of the grains. The removal of these species by H2O evolution at high temperature implies that an irreversible change occurs in the composition of the surface region of the ceramic.


Reflection Spectrum Conduction Layer Ceramic Specimen Effective Path Length Multiple Internal Reflection 


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Copyright information

© Chapman and Hall Ltd 1985

Authors and Affiliations

  • J. B. Bates
    • 1
  • D. Dohy
    • 1
  • R. L. Anderson
    • 1
  1. 1.Solid State DivisionOak Ridge National LaboratoryOak RidgeUSA

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