Abstract
1. The system HClO4-H2O has been studied by direct observation of its behavior on heating and cooling and by optical-crystallographic methods. The existence of an individual hydrate of perchloric acid with the formula HClO4·5 1/2H2O has been discovered. 2. Crystals of HClO4-5 1/2H2O are dimorphic; the a form exists over a very short range of solid solution compositions because of the very slow rate at which equilibrium is established at low temperatures. 3. Crystals of β-HClO4-5 1/2H2O and of the solid solutions in crystals of the β form belong to the cubic crystal class. Crystals of α- and β-HClO4·5 1/2H2O, as well as crystals of the solid solutions based on the β-form, are plastic crystals.
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