Synthetic Study of Three Cesium Zirconates. Crystal Structure of Cs2ZrO3

Teng-Ming Chen, John D. Corbett*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

The syntheses of cesium zirconates, potentially important sinks for fission-product cesium in Zircaloy-clad reactor systems, have been investigated for a diversity of reactions. The most effective synthetic routes involve reactions of elemental Cs and Zr with O2 in open systems at slowly increasing temperatures or of finely divided ZrO2 with Cs2O (from Cs + CsO2) in sealed silver tubing as the temperature is increased to 650–700 °C. Phase-pure Cs2ZrO3 has been obtained and shown to be isostructural with Cs2PbO3(Cmcm, Z = 4, a = 11.271 (7) Å, b = 7.743 (4) Å, c = 5.956 (5) Å; R, Rw = 5.1, 5.8%). Two other cesium zirconates that contain a higher proportion of ZrO2 have also been identified in mixtures produced by the second type of reaction. Their compositions have been estimated as 3Cs2O·7ZrO2 and 2Cs2O·7ZrO2 on the basis of the unit-cell volumes determined from single crystals of each together with known data for Cs2ZrO3 and the previously reported Cs4ZrO4.

Original languageEnglish
Pages (from-to)40-45
Number of pages6
JournalChemistry of Materials
Volume1
Issue number1
DOIs
StatePublished - 1 Jan 1989

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