Beschreibung:
<jats:p>The formation of calcium hydroxide chlorides is an important issue in processes of the chemical raw materials industry, in terms of purification of flue gases, and concrete/cement corrosion. Current information on phase compositions given in the literature are contradictory. In this work systematic solubility studies were carried out at 25, 40, and 60 °C in the system Ca(OH)<jats:sub>2</jats:sub>‐CaCl<jats:sub>2</jats:sub>‐H<jats:sub>2</jats:sub>O and the compositions of the ternary solid phases were precisely determined using the Schreinemakers' method. Two ternary phases were identified, the hydrate 3Ca(OH)<jats:sub>2</jats:sub><jats:bold>·</jats:bold>CaCl<jats:sub>2</jats:sub><jats:bold>·</jats:bold>12H<jats:sub>2</jats:sub>O and the anhydrous calcium hydroxide chloride Ca(OH)<jats:sub>2</jats:sub><jats:bold>·</jats:bold>CaCl<jats:sub>2</jats:sub>. The crystal structure of 3Ca(OH)<jats:sub>2</jats:sub><jats:bold>·</jats:bold>CaCl<jats:sub>2</jats:sub><jats:bold>·</jats:bold>12H<jats:sub>2</jats:sub>O was solved by means of single‐crystal X‐ray diffraction at –123 °C (150 K).</jats:p>