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Phase diagram of the Li2SO4–Na2SO4 system |
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| Authors: | Pavel P Fedorov Vera Y Proydakova Sergey V Kuznetsov Valery V Voronov Alexandr A Pynenkov Konstantin N Nishchev |
| Affiliation: | 1. Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia;2. Mordovia State University, Saransk, Russia |
| Abstract: | The thermal analysis and X-ray powder diffraction studies of the Li2SO4–Na2SO4 system, including the high-temperature X-ray diffraction technique, have elucidated four phases of variable composition: three solid solutions based on the α-Li2SO4, α-Na2SO4, and α-LiNaSO4 high-temperature polymorphs, and a low-temperature β-LiNaSO4 phase. α-Na2SO4-Base solid solution disintegrates into two phases via a monotectoid phase transformation. It is quite probable that the monotectoid process is related to the conversion of the second-order phase transition to the first-order phase transition. |
| Keywords: | high-temperature X-ray diffraction isomorphism lithium sulfate phase diagram second-order phase transitions sodium sulfate solid solutions |