Etude des solutions solides des néphélines (Na, K)AlSiO 4 et (Na, Rb)AlSiO 4

Details Etude des solutions solides des néphélines (Na, K)AlSiO 4 et (Na, Rb)AlSiO 4 Etude des solutions solides des néphélines (Na, K)AlSiO 4 et (Na, Rb)AlSiO 4

Aug 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974gecoa..38.1213r&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 38, Issue 8, pp.1213-1224

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Scientific paper

Ion exchange equilibrium of nepheline solid solutions (Na, K)AlSiO 4 and (Na, Rb)AlSiO 4 with hydrothermal solutions has been studied at 600°C and 2000 bars. The behaviour of dilute solid solutions was specially investigated. Na-Rb ion exchange data can be represented satisfactorily by a model taking into account the existence of two different sites in the structure of nepheline. At 600°C Rb atoms substitute almost exclusively for Na atoms situated in the larger sites. On the other hand, this model only partially applies to Na-K ion exchange equilibrium. Finally, the importance of the ion exchange data concerning extremely dilute solutions to calculate activity-composition diagrams is emphasized with special reference to the nepheline solid solutions.

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