Synthesis and Properties of Scandium and Alkaline-Earth Double Borates M<Subscript>3</Subscript>Sc(BO<Subscript>3</Subscript>)<Subscript>3</Subscript>

Compounds M₃Sc(BO₃)₃ (M = Ba, Sr) were prepared by solid-phase reactions and studied by X-ray diffraction (XRD) analysis and IR spectroscopy. The structural type of the compounds was determined and their unit cell parameters were refined.__________Translated from Zhurnal Prikladnoi Khimii, Vol. 78, No. 1, 2005, pp. 25–27.Original Russian Text Copyright © 2005 by Khamaganova, Khrushcheva.     

Synthesis and electrical properties of double borates Ba<Subscript>3</Subscript>R(BO<Subscript>3</Subscript>)<Subscript>3</Subscript>, R = Ho,Yb, Sc

Polycrystalline samples of double barium borates of the composition Ba₃R(BO₃)₃, R = Ho, Yb, Sc, were synthesized by the method of solid-phase reactions. The temperature dependence of the electrical conductivity of the compounds obtained was studied at 200–500°C.     

Phase formation in the Ba3? x Sr x Y(BO3)3 system (0 < x < 3)

Phases of a variable composition in the Ba_3−x Sr _x Y(BO₃)₃, system (0 < x < 3) have been investigated for the first time using the solid-phase reactions method. The formation of two series of solid solutions crystallizing in different structural types have been established using X-ray diffraction (D-8 Advance diffractometer, CuK _α radiation, graphite monochromator). Crystal characteristics of obtained phases have been determined. Original Russian Text ? T.N. Khamaganova, 2008, published in Zhurnal Neorganicheskoi Khimii, 2008, Vol. 53, No. 4, pp. 553–556.     

Ba3 ? xSrxSm(BO3)3 Solid Solutions (0 < x < 3)

Samples of a continuous series of Ba_{3 − x} Sr _x Sm(BO₃)₃ solid solutions (0 < x < 3), crystallizing in the trigonal crystal (system, space group R3ˉ) were synthesized by solid-phase reactions. Formation of a continuous series of solid solutions in the system was confirmed by X-ray phase analysis. The X-ray characteristics of phases of variable composition were determined. __________ Translated from Zhurnal Prikladnoi Khimii, Vol. 78, No. 12, 2005, pp. 2054–2055. Original Russian Text Copyright ? 2005 by Khamaganova, Oshorova.     

Synthesis of indium alkali-earth double borates M3In(BO3)3

Double borates of composition M₃In(BO₃)₃ (M = Ba, Sr) were prepared by solid-phase reactions and studied using X-ray diffraction powder analysis and IR spectroscopy. The compounds were shown to be isostructural and to crystallize in trigonal space group , Z = 6. Unit cell parameters were refined for both phases.     

Structural specific features and properties of alkaline-earth and rare-earth metal borates

The review summarizes literature data on the synthesis, crystal growth conditions, structures, and physicochemical properties of alkaline-earth and rare-earth element borates. The compounds under consideration were shown to be promising for the use as materials for electronics, laser and luminescent matrices.     

Molecular Weight and Dynamic Properties of Polystyrene Solutions

Eight fractions of polystyrene with linear structure and different molecular weights were prepared by fractional precipitation with methanol from a solution of polystyrene in chloroform. The polystyrene fractions were dissolved in toluene to prepare solutions with different concentrations for dynamic property studies. The dynamic shear modulus and the tangent of the mechanical loss angle for these solutions were measured by the acoustic-resonance method.     

Synthesis of rhombohedral borates Ba3R(BO3)3, R = Pr-Dy

Compounds with the composition Ba₃R(BO₃)₃ (R = Pr, Nd, Sm, Eu, Gd, Tb, Dy) were obtained by solid-phase reactions at 1000°C. The compounds were studied by the methods of IR spectroscopy and X-ray and differential thermal analyses. Physicochemical properties of some of them were determined.     

Phases of variable composition in the system Ba3 ? x Sr x Er(BO3)3 (0 ≤ x ≤ 3.0)

The possibility of preparing two series of solid solutions in the system Ba_{3 − x} Sr _x Er(BO₃)₃ (0 ≤ x ≤ 3.0), crystallizing in different structural types, was examined. Samples of the phases of variable composition were synthesized by the method of solid-phase reactions, and their X-ray phase analysis was done. The X-ray diffraction characteristics of the phases synthesized were determined. Original Russian Text ? T.N. Khamaganova, 2008, published in Zhurnal Prikladnoi Khimii, 2008, Vol. 81, No. 7, pp. 1210–1212.