KLa(SO4)2–CaSO4 System

— Solid-state reactions have been used to study phase relations between KLa(SO 4 ) 2 and CaSO 4 at temperatures in the range 600–800°C. The phase diagram of the KLa(SO 4 ) 2 –CaSO 4 system has been constructed using thermogravimetry and X-ray diffraction results. The system has been shown to contain...

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Bibliographic Details
Published inInorganic materials Vol. 57; no. 2; pp. 142 - 145
Main Authors Bushuev, N. N., Egorova, A. N., Tyul’bendzhyan, G. S.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 2021
Springer Nature B.V
Subjects
Chemistry
Chemistry and Materials Science
Differential thermal analysis
Eutectic temperature
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Materials Science
Phase diagrams
Solid solutions
Thermogravimetry
thermogravimetry
X-ray diffraction
phase diagram
calcium sulfate
potassium lanthanum sulfate monohydrate
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Summary:— Solid-state reactions have been used to study phase relations between KLa(SO 4 ) 2 and CaSO 4 at temperatures in the range 600–800°C. The phase diagram of the KLa(SO 4 ) 2 –CaSO 4 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(SO 4 ) 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(SO 4 ) 2 and CaSO 4 do not show this peak. The largest magnitude of the 900°C endotherm corresponds to a eutectic containing 70 mol % CaSO 4 .
ISSN:0020-1685
1608-3172
DOI:10.1134/S0020168521020047