Funct. Mater. 2016; 23 (4): 657-664.
Thermal properties of solid solution of manganese (II) -cobalt (II) diphosphate
National University of Life and Environmental Sciences of Ukraine, 17 Heroiv Oborony St., 03041 Kyiv, Ukraine
The composition, temperature ranges of formation and thermal stability of heat treatment products of solid solution with the general formula (Mn1-xCox)2P2O7·5H2O (0 leq; x≤0.41) in the range of 298-1273 K were determined. The cation nature effect on them was concretized. The end product of the heat treatment - solid solution of anhydrous diphosphates with composition β-(Mn1-xCox)2P2O7, 0 &leq& x≤ 0.41 (space group C 2/m, Z = 2) - was identified. It was shown, that its formation is realized in two directions. The first of them is realized by 69-66 % due to dehydration of initial crystallohydrate (Mn1-xCox)2P2O7·5H2O. According to the second direction, 31-34 % β-(Mn1-xCox)2P2O7 is formed through solid phase reaction of the intermediate dehydration products. The sequence of thermal and structural transformations, which accompany the heat treatment of the diphosphates (Mn1-xCox)2P2O7·5H2O (0 ≤x≤0.41), was proposed.
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