The Hydrothermal Dissolution of Perovskite (CaTiO3),

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Abstract:

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.

Author(s):
Myhra, S. ; Bishop, H. E. ; Riviere, J. C.
Author Organization(s):
ATOMIC ENERGY RESEARCH ESTABLISHMENT HARWELL (ENGLAND)
Pagination:
0039

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
AERE-R-12390
 Subject Terms
Joint Capability Areas:
JCA_7.2.1_Mitigate Lethal Effects; JCA_7.2_Mitigate; JCA_7_Protection; JCA_3.2_Engagement; JCA_3_Force Application; JCA_3.2.1_Kinetic Means; JCA_5.3_Planning; JCA_5_Command and Control; JCA_1_Force Support; JCA_1.2.7_Experimentation; JCA_1.2_Force Preparation
Modernization Areas:
Microelectronics
Communities of Interest:
Energy and Power Technologies
Descriptor(s):
*PEROVSKITES, *PRECIPITATES, *TITANIUM COMPOUNDS, ATTACK, UNITED KINGDOM, LAYERS, RADIOACTIVE WASTES, RATES, SILICON DIOXIDE, SOLUTIONS(MIXTURES), SURFACE ANALYSIS, SURFACES, THICKNESS, TIME, WASTE DISPOSAL, WATER
Field(s)/Group(s):
Inorganic Chemistry
Report Date:
1986 Nov 01