The Hydrothermal Dissolution of Perovskite (CaTiO3),
ATOMIC ENERGY RESEARCH ESTABLISHMENT HARWELL (ENGLAND)
Pagination or Media Count:
Perovskite CaTiO3 has been exposed to hydrothermal chemical attack in aqueous solution. Dependence on temperature 150-250 C and on duration of attack 1 to 35 days have been investigated. It was found that a precipitate surface layer was formed. The thickness of this layer ranged from a few monolayers to several hundred nanometers for the least and the most severe hydrothermal conditions, respectively. The composition of the layer, as deduced by surface analytical techniques, suggests that i there is congruent dissolution of the perovskite surface, ii a Titanium dioxideTiO2, precipitate layer is formed, and iii the presence of silica and carbon dioxide CO2 in solution do not appear to affect substantially the mechanism of the rate of dissolution. Keywords Pervoskite, Nuclear waste disposal, Hydrothermal dissolution, Surface analysis, Great Britain.
- Inorganic Chemistry