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1. The solid phases Cu(OH)2, CuO2 · H2O, · and CuO2 · H2O2 · H2O, found in a study of the ternary system, and also CuO2 that was synthesized were examined by thermal analysis and active oxygen liberation curves were plotted. 2. The sequence of the processes in the thermal decomposition of all the compounds given was studied. 3. Anhydrous CuO2 is most stable and decomposes at 110–120° to form CuO and O2. 4. The formation of CuO2 by dehydration of CuO2 · H2O2 · H2O was confirmed by thermal analysis data and Debye-Scherrer x-ray diffraction patterns. 5. The compounds CuO2 · H2O and CuO2 · H2O2 · H2O should be regarded as hydroperoxides of the type Cu(OOH) (OH) and Cu(OOH) (OH) · H2O2.

1. The system Cu(OH)2-H2O2-H2O has been studied by a solubility method at temperatures of -36°, -20°, 0° and 20°. 2. In addition to the peroxidic compound of copper formerly known, CuO2 · H2O, the existence of a new compound with a higher content of active oxygen, CuO2 · H2O2 · H2O has been established, this being formed at higher concentrations of hydrogen peroxide in the liquid phase. 3. A polythermal diagram constructed for the temperature range -36° to +20°, giving the limits of equilibrium existence of the solid phases ice, cupric hydroxide, CuO2 · H2O, and CuO2 · H2O2 · H2O, has been obtained. 4. The solid phases of peroxide type obtained have been submitted to additional thermal studies. The compound CuO2· H2O2 · H2O has served as a basis for the synthesis of anhydrous cupric peroxide, CuO2.