Funct. Mater. 2018; 25 (4): 689-694.

doi:https://doi.org/10.15407/fm25.04.689

Double phosphates NaMn6(P3O10)(P2O7)2 and KMn6(P3O10)(P2O7)2 - advanced functional materials

P.G.Nagorny1, N.S.Slobodyanik1, T.I.Ushchapivska2, R.V.Lavrik2

1Department of Inorganic Chemistry, T.Shevchenko National University of Kyiv, 64/13 Volodymyrska St., 01601 Kyiv, Ukraine
2National University of Life and Environmental Sciences of Ukraine, 17 Heroyiv Oborony St., 03041 Kyiv, Ukraine

Abstract: 

Complex phosphates containing two different ions have been identified in the fluxes of M2O-P2O5-Mn2O3 systems (where M - Na, K) for the first time. Optimum conditions for the growing of single crystals of NaMn6(P3O10)(P2O7)2 and KMn6(P3O10)(P2O7)2 compounds have been selected. Complete X-ray diffraction analysis has been performed to study single crystals of synthesized phosphates MMn6(P3O10)(P2O7)2 (where M - Na, K). The structure of compounds is defined by the monoclinic crystal system (space group P21/m) with lattice parameters: a = 5.350 (5.358) Å, b =26.643 (26.697) Å, c = 6.566 (6.575) Å, β = 107.250 (107.220); Z = 2, ρ = 3.575(3.568) g/cm3, respectively. The synthesized compounds have been studied using the following techniques: DTA, IR- and EPR-spectroscopy, magnetochemistry; the dependence of dielectric constant on the temperature has been measured for the obtained phosphates. Slight antiferromagnetic interaction has been detected in octahedron chains [MnO6]. Based on the findings from conducted research, a set of physicochemical properties has been proposed for the synthesized compounds, which can be utilized in the development of these functional materials.

Keywords: 
complex phosphates, EPR, flux crystallization, XRD.

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