Barkhausen jumps in the motion of a single ferroelectric domain wall

It is shown that the motion of a domain wall in the improper ferroelectric-ferroelastic gadolinium molybdate Gd₂(MoO₄)₃ demonstrates a self-organized critical behavior under polarization reversal. Barkhausen pulses are measured experimentally during the jumpwise motion of a single plane domain wall in monocrystalline plates with artificial pinning centers of the “field inhomogeneity” type.     

Recovery of rhenium and osmium from sulfurous gases with solid carbon

The possibility of recovering rhenium and osmium from sulfurous gases generated by oxidative roasting of commercial molybdenite product was examined. When passing through solid carbon packing at a temperature in the range 288?C380°C, higher rhenium and osmium oxides are adsorbed on the surface of the packing to lower oxides, which allows their hydrochemical separation from the reductant with obtaining potassium perrhenate, potassium osmate, and osmium sulfide.     

Electron transport and mobility analysis in La/Sr co-doped CaMnO3–δ

Journal of Solid State Electrochemistry - The specific electric conductivity (σ) and Seebeck coefficient (S) are measured in electron-doped manganites Ca1–х–у Sr x La...     

Condensation of silica nanoparticles on a phospholipid membrane

The structure of the transient layer at the interface between air and the aqueous solution of silica nanoparticles with the size distribution of particles that has been determined from small-angle scattering has been studied by the X-ray reflectometry method. The reconstructed depth profile of the polarizability of the substance indicates the presence of a structure consisting of several layers of nanoparticles with the thickness that is more than twice as large as the thickness of the previously described structure. The adsorption of 1,2-distearoyl-sn-glycero-3-phosphocholine molecules at the hydrosol/air interface is accompanied by the condensation of anion silica nanoparticles at the interface. This phenomenon can be qualitatively explained by the formation of the positive surface potential due to the penetration and accumulation of Na⁺ cations in the phospholipid membrane.     

Emissive metallomesogens based on 2-phenylpyridine complexes of iridium(III)

Preparation of Ir(III) complexes using anisotropic 2,5-di(4-alkoxyphenyl)pyridine ligands leads to emissive, liquid-crystalline complexes containing bound Cl and dimethyl sulfoxide. Using analogous poly(alkoxy) ligands allows the preparation of bis(2-phenylpyridine)iridium(III) acac complexes, which are also mesomorphic. The observation of liquid crystallinity in octahedral complexes of this type is without precedent.     

X-ray investigations of surface roughnesses

The unique potentialities and prospects for practical use of the X-ray scattering method as applied to the study and testing of surface roughnesses are considered. The high sensitivity, informative capability, and reliability of this method are demonstrated by using numerous examples. The results obtained by the X-ray scattering method at different wavelengths are compared with the available data of atomic-force microscopy.