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 precipitated surface layer was formed. The thickness of this layer ranged from a few mono-layers 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 TiO2 precipitate layer is formed, and (iii) the presence of silica and CO2 in solution do not appear to affect substantially the mechanism of the rate of dissolution. Keywords: Nuclear waste disposal, Hydrothermal dissolution, Surface analysis.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1986
Accession Number
ADA191818

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

  • Acquisition
  • Auger Electron Spectroscopy
  • Auger Electrons
  • Calcium Compounds
  • Chemistry
  • Crystal Structure
  • Electron Energy
  • Electrons
  • Kinetic Energy
  • Light Water Reactors
  • Materials
  • Nuclear Reactors
  • Stainless Steel
  • Steel
  • Surface Analysis
  • Surface Properties
  • X Rays

Readers

  • Electrochemical Engineering/ Fuel Cell Technologies
  • Materials Science and Engineering.