X-Ray Diffraction and Mössbauer Studies of the Structural Features of BiFe<Subscript>1 ‒ <Emphasis Type="Italic">x</Emphasis></Subscript>Zn<Subscript><Emphasis Type="Italic">x</Emphasis></Subscript>O<Subscript>3</Subscript> Multiferroics

The structure of ceramic BiFe_1?xZn_xO₃ multiferroic samples is investigated using the X-ray diffraction method and Mössbauer spectroscopy. X-ray diffraction analysis of the samples indicates the existence of the Bi₁₂(Bi_0.5Fe_0.5)O_19.5 impurity phase. High-temperature heating of the samples generates additional phases. The parameters of the Mössbauer spectra depend on the zinc concentration. In this case, for pure bismuth ferrite, the spectrum is a superposition between two Zeeman sextets and two paramagnetic doublets arising from two nonequivalent magnetic and electrical positions occupied by iron ions at the crystallattice sites of a sample. The replacement of iron ions with zinc ions substantially affects the spectrum parameters. This is probably related to changes in the spin-cycloid structure typical of multiferroics, the destruction of which stimulates the appearance of significant magnetoelectric interactions.     

Specific Heat and Magnetocaloric Effect of LaFe11.2 – xMnxCo0.7Si1.1 (x = 0, 0.1, 0.2, 0.3)

Physics of the Solid State - The specific heat and the magnetocaloric effect of intermetallic LaFe11.2&nbsp;–&nbsp;xMnxCo0.7Si1.1 (x = 0, 0.1, 0.2, 0.3) compounds have been measured...     

Prediction of phase equilibria in hydrocarbon + near-critical solvent systems

In this paper the Hole Quasichemical Group-Contribution model (HM) is used to describe phase diagram peculiarities of multicomponent aqueous systems containing hydrocarbons and alcohols. The model correctly describes liquid-liquid (LL), liquid-liquid-vapour (LLV), liquid-vapour (LV) and vapour-vapour equilibria (VVE), and critical and azeotrope curves. The potential use of the HM in the prediction of the solubilities of hydrocarbons in near-critical water and the densities of coexisting phases in the critical region of the system n-hexane-water are presented.