The Hydrothermal Dissolution of Perovskite (CaTiO3),

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 dioxide(TiO2), 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.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1986
Accession Number
ADA190088

Entities

People

  • H. E. Bishop
  • J. C. Riviere
  • S. Myhra

Tags

Communities of Interest

  • Energy and Power Technologies
  • Ground and Sea Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Auger Electron Spectroscopy
  • Auger Electrons
  • Chemistry
  • Crystal Structure
  • Dioxides
  • Electron Energy
  • Electron Spectroscopy
  • Electrons
  • Energy
  • Kinetic Energy
  • Materials
  • Measurement
  • Nuclear Energy
  • Stainless Steel
  • Steel
  • Surface Properties
  • Titanium

Readers

  • Electrochemical Engineering/ Fuel Cell Technologies
  • Environmental Engineering.
  • Surface Coatings Technology.