[en] Investigation results of lithium, sodium and potassium interaction with tellurium dioxide at 1073-1223 K are presented. Decrease of the value of polyphosphate average molecular mass and melt viscosity by the growth of tellurium dioxide content in initial impurities, temperature and interaction time is stated. Polyanion destruction is confirmed by tetra-, piro-, orthophosphate availability in hardened interaction products. Tellurium dioxide interaction with polyphosphate was followed by formation of tellurium (6) compounds

[en] Using the method of physicochemical analysis, the interaction of copper selenide Cu₂Se with samarium selenide Sm₂Se₃ is studied and the phase diagram of Cu₂Se-Sm₂Se₃ is plotted. The formation of solid solutions based on initial components and of two ternary compounds Cu₅-SmSe₄ and CuSmSe₂ is established. Cu₅SmSe₄ is formed at 775 deg C and it melts incongruently at 1080 deg C; CuSmSe₂ decomposes at 1000 deg C

[en] The methods of thermography, volumetry, gravimetry, IR spectroscopy and chemical analysis have been used to study the properties of compounds formed in the course of interaction of K₃C₃N₃O₃ water solution with praseodymium chloride. It is shown that the product obtained represents a normal praseodymium cyanurate. Thermal decomposition of this compound occurs in the 520-690 deg C temperature range and results in production of praseodymium oxocyanide having a chain structure

[en] By the methods of differential, thermal, X-ray phase, Raman spectra and IR spectroscopic analyses and measuring electric conductivity the interaction of components in the Li₂O-MoO₃-SnO₂ system is studied. Formation of 2Li₂OxSnO₂x2MoO₃ and Li₂Sn(MoO₄)₃ compounds melting congruently at 660 and 785 deg C respectively is pointed out. Triangulation of the Li₂O-MoO₃-SnO₂ system is performed

[en] By the solubility method the systems ZnCl₂-C₂H₅N₃O₂-H₂O and CdCl₂-C₂H₅N₃O₂-H₂O are studied at 30 deg. It has been found in the systems a formation of incongruently soluble compounds: ZnCl₂x2C₂H₅N₃O₂, ZnCl₂xC₂H₅N₃O₂, 2ZnCl₂xC₂H₅N₃O₂, CdCl₂x1.5C₂H₅N₃O₂ and congruently soluble compound CdCl₂x2C₂H₅N₃O₂

No abstract available

[en] A study was made on the interaction in the LaCl₃-KPO₃-H₂O and NdCl₃-KPO₃-H₂O systems at 0 deg C by methods of solubility of residual concentrations and measurement of the pH value. The formation of binary KLa₂(PO₃)₇x10H₂O and KLa(PO₃)₄X5H₂O lanthanum- and potassium polyphosphates, as well as KNd₂(PO₃)₇X10H₂O and KNd(PO₃)₄X5H₂O neodymium- apd potassiUm polyphasphates was established. Chemical, paper-chromatographic, infrared spectroscopic, X-ray diffraction and differential thermal analyses of the prepared compoUnds were conducted. Anhydrous binary lanthanum- and neodymium polyphosphates with potassium-=Kla(PO₃)₄, KNd(PO₃)₄, KLa₂(PO₃)₇ and KNd₂x(PO₃)₇ - eere prepared

[en] Solubility isotherm in the Na₃VO₄-Na₃PO₄-H₂O system at 25 deg C was plotted. The composition and properties of solid phases were determined by the residue method and physico-chemical analyses. Solid solutions are formed in the system at sodium vanadate content not less than 8.32 mass.% in a liquid phase. A sharp decrease in the solubility of vanadate, sodium phosphate and mixed crystals is observed in aluminate solutions; other properties are identical with those of the crystals, prepared in the Na₃VO₄-Na₃PO₄-H₂O system

No abstract available

[en] Using the methods of NMR (¹H, ¹⁹F) and IR spectroscopy compounds of the composition Ln(CF₃COO)₃x3H₂O, where Ln=Sm, Eu, Er and Yb, have been studied. The conclusion is made on isostructurality of the complexes considered and the complex Pr(CF₃COO)₃x3H₂O, the structure of it being known. Trifluoroacetate complexes of rare earths are built of dimers [Ln(CF₃COO)₃x3H₂O]₂, in which lanthanide ions are bound by four bridge carboxylic groups. All the rest vacancies in rare earth ion coordination sphere are occupied by three water molecules and monodentate anion CF₃COO^-. A supposition on similar structure of all paramagnetic complexes of the composition Ln(CF₃COO)₃x3H₂O is made