EXTENDED DEFECT AS A MECHANISM FOR THE IMMOBILIZATION OF HLW SPECIES IN ZIRCONOLITE, PEROVSKITE AND HOLLANDITE.

T. J. White*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

High resolution electron microscopy, analytical electron microscopy and selected area electron diffraction are used to establish the crystallo-chemical mechanisms by which simulated high level waste enters Synroc. It is shown that waste species are incorporated largely as a non-continuous solid solution. In other words, simple isomorphic substitution of waste elements in place of matrix cations, i. e. the classical continuous solid solution, does not operate (or is only significant at very low waste levels of radwaste). It is believed that the mechanism of structural modification will endow Synroc with considerable flexibility to respond to chemical changes in the wastestream. Other ceramic materials currently being evaluated as possible wasteforms (viz. sphene glass-ceramics and APO//4 phosphates) are also likely to possess this capacity.

Original languageEnglish
Title of host publicationMaterials Research Society Symposia Proceedings
EditorsLars O. Werme
PublisherMaterials Research Soc
Pages283-290
Number of pages8
ISBN (Print)0931837154
Publication statusPublished - 1986
Externally publishedYes

Publication series

NameMaterials Research Society Symposia Proceedings
Volume50
ISSN (Print)0272-9172

ASJC Scopus Subject Areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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