Systems containing hydrogen peroxide at high concentration Communication 15. The 10� solubility isotherm of the ternary system Ca(OH)2-H2O2-H2O and further characterization of the solid phases

Abstract

1. From the isothermal solubility data between −21 and +10° we constructed a polythermal diagram of the Ca(OH)2-H2O2-H2O ternary system with solid phases of CaO2 · 8H2O, CaO2 · 2H2O, and CaC2 · 2H2O2. 2. The crystals of anhydrous calcium peroxide, its hydrates and peroxyhydrates belong to a lower symmetry system than cubic. 3. An x-ray crystallographic investigation of CaO2 and CaO2 · 8H2O powders supported the literature data which assigned to these crystals tetragonal symmetry. 4. Introduction of two water molecules into a CaO2 lattice produces only an insignificant change in its basic structure. Evidently the water molecules occupy vacant places between the atoms. 5. The x-ray photographs of CaO2 · 2H2O2 powders differ very sharply from those of the other calcium compounds, which indicates that this compound possesses a distinct structure of its own.