Solid–liquid phase diagrams of binary salt hydrate mixtures involving magnesium nitrate and acetate, magnesium and aluminum nitrates, ammonium alum and sulfate, and ammonium alum and aluminum sulfate

Abstract

The solid–liquid phase diagrams of binary mixtures of magnesium nitrate hexahydrate with magnesium acetate tetrahydrate and with aluminum nitrate nonahydrate and of ammonium alum with ammonium sulfate and with aluminum sulfate octa- or hexadecahydrate are presented. The phase diagrams of ammonium alum with ammonium- and with aluminum sulfate, exhibiting a sharp eutectic, were fitted by the Ott equation. The magnesium-nitrate-rich part of the diagram with aluminum nitrate is modeled by the BET method.