Abstract
The polymorphism of Ba(OH) 2 described in the literature, has been investigated by crystallographic, infrared spectroscopic, and calorimetric techniques. From the X-ray powder diffraction pattern it has been found that the β phase has a monoclinic structure (space groups P2 1 or P2 1/m) with a = 6.7835(6), b = 7.9268(6), c = 9.4246(10) A ̊ and β = 95.823(9)°. A phase transformation to α-Ba(OH) 2 occurs at 526 ± 1 K, which upon cooling in a dry atmosphere remains unchanged. However, a reversible phase transition α → β is observed in the presence of traces of water vapour, acting as a catalyst. The thermodynamic properties of α-Ba(OH) 2, including fusion, have been measured. In addition, the fusion properties of Sr(OH) 2 are discussed.
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