The exchange reaction of Na-sodalite with KCl was studied by means of hightemperature X-ray powder diffraction, ex-situ and in-situ, up to 800 °C. The powder data were fully refined with the Rietveld method and showed that a substantial amount of K enters the structure in the same crystallographic position of Na, causing some Cl ions to be displaced from their position. The paper shows that sodalite is a potentially good matrix for trapping alkaline metal ions from the electrorefining process of nuclear waste and proposes a method to quickly estimate the amount of K in the structure.
Structural characterisation of hightemperature K-exchanged sodalite
ARTIOLI, GILBERTO;
2006
Abstract
The exchange reaction of Na-sodalite with KCl was studied by means of hightemperature X-ray powder diffraction, ex-situ and in-situ, up to 800 °C. The powder data were fully refined with the Rietveld method and showed that a substantial amount of K enters the structure in the same crystallographic position of Na, causing some Cl ions to be displaced from their position. The paper shows that sodalite is a potentially good matrix for trapping alkaline metal ions from the electrorefining process of nuclear waste and proposes a method to quickly estimate the amount of K in the structure.
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