Thermal properties of Zn and Co(II) dihydrogenphosphate solid solution

Chem. Met. Alloys 10 (2017) 1-6

https://doi.org/10.30970/cma10.0333

N.M. ANTRAPTSEVA, L.B. KOVAL, I.S. NOVAK

The thermal properties of the solid solution Zn_1-xCo_x(H₂PO₄)₂·2H₂O (0 < x < 1.00) were investigated. It was found that the thermal stability of the dihydrogenphosphates correlates with the cationic composition and increases with increasing cobalt(II) content. The composition-dependent temperature range of formation and thermal stability of the products of partial and complete dehydration were determined. It was established that the final product of dehydration is a cyclotetraphosphate solid solution of composition (Zn_1‑xCo_x)₂P₄O₁₂, 0 < x < 1.00 (monoclinic, space group C2/c, Z = 4), which remains stable when heated to 900°C. A sequence of solid-phase transformations taking place during the heat treatment is proposed.

Thermal properties of Zn_0.5Co_0.5(H₂PO₄)₂·2H₂O.

Keywords

Phosphates / Solid solutions / Thermal properties