Synthesis, Structure Determination, and Aqueous Durability of Cs2ZrSi3O9

M. Lou Balmer, Yali Su, Hongwu Xu, Eric Bitten, David McCready, Alexandra Navrotsky

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

The structure of Cs2ZrSi3O9 synthesized using a sol-gel method was determined from the Rietveld refinement of experimental powder X-ray diffraction data. The refinement confirmed that this compound was isostructural with wadeite: its structure was hexagonal (space group P63/m), and its lattice parameters were a = 7.2303(2) Å and c = 10.2682(4) Å. The aqueous durability of Cs2ZrSi3O9 varied, depending on the solution conditions. In modified leach tests with buffered (pH 7) and unbuffered solutions, the 7-d cesium release rates were <1.2 × 10-4 g·(m2·day)-1, which indicated high aqueous durability. However, in unsaturated, unbuffered solutions with a pH of 9-10, the durability was much lower, with 7-d cesium release rates of 2.2 × 10-3 g·(m2·day)-1. The ability of this material to retain cesium in aqueous environments can be explained by its condensed ring structure, in which the size of the channel openings is smaller than the diameter of a Cs+ ion. However, dissolution of the network silicate occurred at high pH, which resulted in the release of cesium.

Original languageEnglish (US)
Pages (from-to)153-160
Number of pages8
JournalJournal of the American Ceramic Society
Volume84
Issue number1
DOIs
StatePublished - Jan 2001
Externally publishedYes

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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