Browsing by Author "Khainakov, S."

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    Synthesis and structural investigations of tantalates phosphates in the flux system Na2O-P2O5-Ta2O5-MoO3
    (Видавництво Львівської політехніки, 2012) Odynets, I. V.; Doroshenko, O. M.; Babaryk, A. A.; Slobodyanik, N. S.; Khainakov, S.; Baumer, V. N.
    The complex sodium-tantalum phosphates (Na2Ta6P4O26, Na3Ta7P4O29, Na4Ta8P4O32) have been synthesized using the flux method in the quasi-quaternary system Na2O–P2O5–Ta2O5–MoO3. These compounds are isostructural with family of sodium-niobium phosphates NaxNb2mP4O6m+8 and tightly related to monophosphate tungsten bronzes (MPTBp) with pentagonal-shaped tunnels. The structure of these phosphates has been investigated by X-ray powder and single crystal diffraction. Their threedimensional frameworks consist of slabs of corner-shared TaO6 distorted octahedra connected via isolated PO4 tetrahedra and delimit pentagonal tunnels running along c, where Na atoms are located. The solid state band gap measurements gave reasonable prospects for its photocatalytic activity
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    Synthesis and structural relationship of complex tantalum phosphates in the flux system K2O–P2O5–Ta2O5–MoO3
    (Видавництво Львівської політехніки, 2012) Babaryk, A. A.; Odynets, I. V.; Baumer, V. N.; Slobodyanik, N. S.; Khainakov, S.; Hoffmann, S.
    Single crystals of K2Ta4O11 (I), K(TaO2)2PO4 (II) and K3Ta5O11(PO4)2 (III) were synthesized by flux-aided method in the pseudo-quaternary system K2O–P2O5–Ta2O5–MoO3. Tight interrelation of their crystal structures has been found via X-ray diffraction study. Experimental solid-state band gap measurements revealed its semiconductor nature corroborated with DFT calculations. Local structure of PO4 groups in (II) and (III) compounds was probed with 31P MAS NMR spectroscopy.