A calorimetric study of LiClO4 · 3H2O

The heat capacity of LiClO₄ · 3H₂O was measured from 17 to 343 K, in order to determine the relationship between its phase diagram and the phase diagrams of divalent metal perchlorate hexahydrates The heat capacity curve of pure LiClO₄ · 3H₂O was found to be smooth, indicating an absence of polymorphism, although a small amount of excess perchloric acid in one sample gave rise to a eutectic point at 232 8 ± 0 3 K The absence of transitions in LiClO₄ · 3H₂O is discussed in terms of its known structure, and some conclusions are drawn concerning the differences in H-bonding in this salt and in divalent metal perchlorate hexahydrates.