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1. The system Zn (OH)2-H2O2-H2O was studied at 30,20, 0, −10, and −20° by the solubility method. 2. The true composition and succession of changes in the system Zn(OH)2-H2O2-H2O were established from a general analysis of data for the diagrams ZnO-H2O-1/2 O2 and ZnO-H2O2 in the liquid phase. 3. In the system Zn (OH)2-H2O2-H2O in the temperature range from 30° to −20° it may be considered provisionally that the following solid phases exist: a) a series of hydrates of zinc peroxide: ZnO2 · 2H2O; ZnO2 · 1.5H2O; ZnO2 · H2O; ZnO2 • 0.5H2O; b) anhydrous zinc peroxide ZnO2; c) zinc peroxide monohydrate semiperhydrate: ZnO2 · 0.5H202 β H2O; d) perhydrates of zinc peroxide: ZnO2 · H2O2, ZnO2 · 2H2O2. 4 Comparison of our data on the system Zn (OH)2 - H2O2 - H2O in the temperature range from 30° to − 20° with data in the literature (Figure 1) shows that the great majority of the peroxy compounds of zinc reported previously were probably mechanical mixtures. 5. The polythermal solubility diagram of the ternary system Zn (OH)2 - H2O2 - H2O was constructed and enables the limits of existence of the solid phases of the system to be determined.

1. A method has been developed and peroxide compounds of zinc of the composition ZnO2 · H2O and ZnO2 · 0.5H2O have been prepared from solutions of zinc salts and hydrogen peroxide. 2. Dehydration of ZnO2 · H2O with absolute alcohol and ether leads to the formation of ZnO2 · 0,5H2O. 3. Investigation of the properties of the compounds obtained has shown that ZnO2 · H2O and ZnO2 · 0.5H2O can be considered as compounds with a hydroperoxide structure: $$Zn\begin{array}{*{20}c} { / OOH} \\ { \setminus OH} \\ \end{array} {\text{and}} \begin{array}{*{20}c} \hfill {{\text{Zn}} - {\text{OOH}}} \\ \hfill {\text{|}} \\ \hfill {\text{O}} \\ \hfill {\text{|}} \\ \hfill {{\text{Zn}} - {\text{OOH}}} \\ \end{array} $$