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Funct. Mater. 2018; 25 (1): 151-157.

doi:https://doi.org/10.15407/fm25.01.151

Peculiarities of thermal solid-phase transformations of hydrogenphosphates Co(II)-Mn(II)

N.M.Antraptseva, N.V.Solod, R.S.Zhyla

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

Abstract: 

Peculiarities of thermal solid-phase transformations of Co1-xMnxHPO4·1.5 H2O (0 ≤ x ≤ 0.45), which accompanying the formation of a final product of thermolysis - anhydrous diphosphate solid solution with composition β-(Co1-xMnx)2P2O7 (0 < x le; 0.45) are established. It is shown that low-temperature α-modification of the diphosphate is the first formed during heat treatment of the hydrogenphosphates Co1-xMnxHPO4·1.5H2O with 0 <x ≤ 0.15. Crystalline β-(Co1-xMnx)2P2O7 (x≤0.15) is formed only after the polymorphic transformation of the α-form into the β-form. The formation of β-(Co1-xMnx)2P2O7 with 0.15 < x ≤ 0.45 occurs bypassing the α-form. Free phosphoric acid during the heat treatment Co1-xMnxHPO4·1.5H2O (0 < x ≤ 0.45) are is not formed.

Keywords: 
hydrogenphosphates, solid solution, solid-phase transformations, dehydration.
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