Sustituciones SeO42--SO42- en el yesoun estudio experimental
- Fernández González, Ángeles 1
- Andara, A.
- Prieto Rubio, Manuel 1
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1
Universidad de Oviedo
info
ISSN: 0213-683X
Año de publicación: 2004
Número: 36
Páginas: 95-98
Tipo: Artículo
Otras publicaciones en: Geogaceta
Resumen
Selenate (SeO2-4) and sulfate (S02-4) have similar structural and chemical properties, and they can play a similar geochemical role. The competition between both anions has been considered in different fields. We present experimental work on crystallisation of Ca (SeO4 ,S04) 2H2 0 solid solutions from aqueous solutions. A complete structural characterization of salid solutions by X-ray powder diffraction and thermocalorimetic analysis were carried out. The differences in structural parameters for the different salid compositions have allowed us to quantify the non-ideality of the salid solution and the calculation of a thermodynamic model of this salid solution-aqueous solution system. In addition, the work includes some observations on dehydration behaviour of CaSeO4.2H2 0-CaSO4.2H2 0 endmembers and salid solutions.