Oksana V. Livitska

Chemical Interaction of Phosphates MII2P4O12 with Melted MICl or MINO3 (MI – Li, Na, K; MII – Mg, Co, Ni, Zn)

The interaction in the systems MII2P4O12-MICl (MINO3) (MI – Li, Na, K; MII – Mg, Co, Ni, Zn) was investigated in temperature range 1073-673 K. The conditions of formation phosphates: Li3PO4, MIMIIPO4 (MI – Na, K), Na4MII3(PO4)2P2O7, Na9Co3(PO4)5 have been established. Obtained crystalline phases have been investigated using X-ray powder diffraction, Diffuse reflectance, Raman and FTIR spectroscopy and scanning electron microscopy methods.

Interaction between Co2P4O12 and alkali metal nitrate (chloride) melts

Reactions between Co2P4O12 and alkali metal nitrate (chloride) melts was studied in the temperature range 350–400°C (800–850°C) at different phosphate/melt ratios. The effect of the nature of an alkali metal and the ratio between the components in the Co2P4O12-MINO3 (MICl) system on composition of the reaction products was established. The resulting crystalline phases (NaCoPO4, Na4Co3(PO4)2P2O7, Na9Co3(PO4)5 and KCoPO4) were studied by X-ray powder diffraction, IR and electron spectroscopy, and scanning electron microscopy. The features of transformation of the Co2P4O12 framework into KCoPO4 under the effect of excessive alkali metal ions in the melt are discussed.

Interaction in the systems M II 2 P 4 O 12 -M I Cl(M I NO 3 ) (M I - Li, Na, K; M II - Co, Ni)

The interaction in the systems M^II₂P₄O₁₂-M^ICl (M^INO₃) (M^I - Li, Na, K; M^II - Co, Ni) was investigated in temperature range 673-1073 K. Obtained crystalline phases have been investigated using X-ray powder diffraction, electronic, Raman and FTIR spectroscopy and scanning electron microscopy.

The solid solution K3.84Ni0.78Fe3.19(PO4)5

The title compound, tetrapotassium tetra[nickel(II)/iron(III)] pentakis(orthophosphate), K3.84Ni0.78Fe3.19(PO4)5, has been obtained from a flux. The structure is isotypic with that of K4MgFe3(PO4)5. The three-dimensional framework is built up from (Ni/Fe)O5 trigonal bipyramids with a mixed Fe:Ni occupancy of 0.799 (8):0.196 (10) and isolated PO4 tetrahedra, one of which is on a general position and one of which has -4.. site symmetry. Two K+ cations are statistically occupied and are distributed over two positions in hexagonally shaped channels that run parallel to [001]. One K+ cation [occupancy 0.73 (3)] is surrounded by nine O atoms, while the other K+ cation [occupancy 0.23 (3)] is surrounded by eight O atoms.