Funct. Mater. 2021; 28 (3): 573-579.

doi:https://doi.org/10.15407/fm28.03.573

Features of the synthesis of solid solutions of divalent metal phosphates with a newberyite structure

N.M.Antraptseva, N.V.Solod, O.O.Kravchenko

National University of Life and Environmental Sciences of Ukraine, 17 Heroiv Oborony Str., 03041 Kyiv, Ukraine

Abstract: 

The conditions for joint pair precipitation of isomorphic cations Mn2+ and Mg2+, Mn2+ and Co2+, Mn2+ and Zn2+ in the form of hydrogen phosphates are determined. Three solid solutions Mn1-xMgxHPO4·3H2O (0 < x < 1.00), Mn1-xCoxHPO4·3H2O (0 < x ≤ 0.2) and Mn1-xZnxHPO4·3H2O (0 < x ≤ 0.07) with the newberyite structure are synthesized. It was shown that they are formed as a result of isomorphic substitution of the manganese(II) cation in the crystal lattice of the matrix hydrogen phosphate. The ranges of solid solution homogeneity vary widely: from continuous, as in Mn1-xMgxHPO4·3H2O (0 < x < 1.00), to limited by a narrow interval of homogeneity, as in Mn1-xCoxHPO4·3H2O (0 < x ≤ 0.2) and Mn1-xZnxHPO4·3H2O (0 < x ≤ 0.07). The fact that different ranges of homogeneity are realized is substantiated using the characteristics of co-precipitated cations.

Keywords: 
solid solution, hydrogen phosphate, newberyite structure.

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