The crystallization of Ba-substituted CsTiSi2O6.5 pollucite using CsTiSi2O6.5 seed crystals

Terry J. Garino, Tina M. Nenoff, Tae Jin Park, Alexandra Navrotsky

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Barium (Ba)-substituted CsTiSi2O6.5 materials of two types, CsxBa1-xTiSi2O(7-x/2) and CsxBa(1-x)/2TiSi2O6.5 were synthesized with the pollucite structure with 1≥x≥0.6. When the Ba-substituted precursor materials were heat treated to 850°C for 4 h, a mixture of amorphous and unidentifiable phases formed. However, with the addition of 10 wt% of crystalline CsTiSi2O6.5 to the Ba-containing precursors, nearly single-phase pollucite was obtained after 20 h at 750°C for x≥0.6. The added crystalline CsTiSi2O 6.5 particles act as nuclei that allow the Ba-containing materials to crystallize into the pollucite phase and to avoid the formation of unwanted phases that would otherwise nucleate and grow. These new materials can be used to study the stability of CsTiSi2O6.5 as a durable ceramic waste form, which could accommodate with time both Cs and its decay product, Ba.

Original languageEnglish (US)
Pages (from-to)2144-2146
Number of pages3
JournalJournal of the American Ceramic Society
Volume92
Issue number9
DOIs
StatePublished - Sep 2009
Externally publishedYes

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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