Abstract
A phase diagram of the tetraethylammonium hydroxide-water binary system was studied by differential thermal analysis. Seven crystal phases of tetraethylammonium hydroxide were found. Two of them are stable: tetrahydrate (T m = 47.0°C), two phases of a compound with the hydration number 7.5 (T m = −18.1 and −23.2°C); five are metastable phases: two polymorphs of pentahydrate (T m = 39.4 and 0.9°C), hexahydrate (T m = −70.1°C), and a compound with hydrate number 10–11 (T m = −112°C).
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