Journal
SOLID STATE IONICS
Volume 176, Issue 35-36, Pages 2663-2669Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ssi.2005.07.007
Keywords
cesium; phosphate; rhabdophane; nuclear wastes
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The synthesis mechanism of CsCaNd(PO4)(2) from nitrates, carbonates and oxides of the different cations was investigated with the aim of immobilizing cesium. Two transitory phases, a monazite-type one, NdPO4, and a poorly crystallized cesium phosphate, CsCaPO4, were proposed to explain the formation of CsCaNd(PO4)(2). Direct synthesis from NdPO4 and CsCaPO4 was thus carried out. It allowed to underline that within a 900-1000 degrees C temperature range the rhabdophane structure, CsCaNd(PO4)(2), was formed. However, the reaction was also found to be incomplete and this was assumed to be due to a lack of reactivity in concern with the high stability of monazite. (c) 2005 Published by Elsevier B.V.
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