E. V. Zabolotskaya

Extraction of Vanadium (IV) with DI-2-Ethylhexylphosphoric Acid

Abstract It was established with the use of electron and ESR spectroscopic methods that in the presence of sodium sulfate, the extraction of vanadium (IV) with di-2-ethylhexylphosphoric acid takes place by a cation-exchange mechanism giving rise to two complex compounds of vanadium (IV) oxocation with sulfuric and di-2-ethylhexylphosphoric acid anions. The vanadium (IV) oxocation sulfate complex extracted in the solid state was examined with X-ray structural analysis. It was shown that the vanadium (IV) oxocation sulfate complex trihydrate crystallizes in the centrosymmetrical space group to form dimers with bridging sulfate groups. GRAPHICAL ABSTRACT

Synthesis and magnetic properties of a new layered oxide La1.5Sr1.5Mn1.25Ni0.75O6.67

A new oxide phase La1.5Sr1.5 Mn1.25Ni0.75O6.67 ± 0.05, a member of the An + 1 BnO3n+1(n=2) Rad-dlesden—Popper homologue series, was synthesized, and its structure and magnetic properties characterized. Magnetic anomalies associated with the competition between antiferromagnetic and ferromagnetic orders are observed in the range of the temperatures studied (2-400 K). The ESR spectra of the compound feature the constriction of a magnetic signal and a shift toward g(Mn4+).

Synthesis and Characterization of the LiMnP1–xVxO4–δ Solid Solutions

Compounds with the olivine-type structures are considered as perspective materials for lithium-ion power sources for both industrial and transport applications. Lithium iron phosphate is most highly developed from this family, but LiMnPO4 is supposed as much promising, due to its higher EMF vs. lithium. One of the main lacks of this class of materials is the low electronic conductivity. The traditional ways of conductivity increase by partial replacement of Mn with other transition metal for LiMnPO4 do not result to essential success. Our approach consisting in the influence onto anion sublattice results to better effect. Such solid solutions should be suitable for oxygen nonstoichiometry creation in virtue of ability of vanadium ion for oxidation degree downturn. Using magnetic methods, we succeeded to show that the required solid solutions are really formed. The optimal synthesis conditions of LiMnP1-xVxO4-δ solid solutions were determined. It was shown, that the doping of LiMnPO4 by vanadium jointly with oxygen nonstoichiometry brings to substantial enhance of electronic conductivity in this material. Observed peculiarities of the magnetic properties indicate the restructuring in the local environment in anion sublattice.

Structure and electrical properties of oxygen-deficient strontium copper niobate

AbstractThe transport properties of Sr5.66 Cu0.14Nb2.20 O11.30 double perovskite, which enters the homogeneity region of (Sr1-yCuy)6–2xNb2+2xO11+3x solid solution, are concerned. The total conductivity is differentiated into terms over wide ranges of temperatures and oxygen partial pressures

MVO4-Ta2O5-Nb2O5 (M = Y, La) solid solutions

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New oxide phases Ln2 − x Sr1 + x CuMnO6.5 (Ln = Pr, Nd): Synthesis and magnetic properties

in dry and humid atmospheres. When

Spectroscopic Study of Vanadium(IV) Extraction with Di-2-ethylhexylphosphoric Acid

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