SOFT MECHANOCHEMICAL SYNTHESIS OF ZINC, MANGANESE AND NICKEL DIPHOSPHATES

Abstract

Introduction. Currently, condensed phosphates are used in many growths, while crystalline phosphate polymers were previously obtained by thermolysis, which is economically and environmentally unprofitable. In this regard, obtaining the required product at relatively low temperatures by mild mechanochemical synthesis (MMhC) is one of the urgent tasks. The purpose of this work is to establish conditions for the soft mechanochemical synthesis of zinc, manganese and nickel diphosphates.  To achieve the goal of the work, a new mechanothermal method for the production of diphosphates of a number of d-elements (Zn, Mn, Ni) was developed, consisting of two stages of synthesis: 1) in the mechanochemical process of diphosphate; 2) in the heat treatment of the intermediate product. The mechanochemical synthesis was carried out in grinding machines, at a modern RETSCH brand planetary mill. Also, various complexes of physico-chemical research methods were used to study the properties and composition of the obtained materials. Results and discussions. With mechanochemical activation of the studied mixtures, intermediate compounds - NH₄M(II)PO₄ can be obtained, and thermolysis at low temperatures – target products - individual diphosphates Zn, Mn, Ni (400°C, 300°C, 500°C.) It has been established that this method is environmentally friendly and low energy costs. Conclusion. Conditions for the soft mechanochemical synthesis of zinc, manganese and nickel diphosphates were established.