Abstract
Solid-state reactions have been used to study phase relations between KLa(SO4)2 and CaSO4 at temperatures in the range 600–800°C. The phase diagram of the KLa(SO4)2–CaSO4 system has been constructed using thermogravimetry and X-ray diffraction results. The system has been shown to contain neither intermediate compounds nor solid solutions. The KLa(SO4)2 double sulfate decomposes at a temperature of 970°C. An endothermic peak at a temperature of 900°C is observed over the entire composition range and corresponds to a eutectic line. Differential thermal analysis curves of the constituent sulfates KLa(SO4)2 and CaSO4 do not show this peak. The largest magnitude of the 900°C endotherm corresponds to a eutectic containing 70 mol % CaSO4.
Published Version
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