Ion Conductivity and Vibrational Spectra of LiNO3–KNO3 + Al2O3 Composites

Russian Journal of Electrochemistry - Composite solid electrolytes are synthesized on the basis of the eutectic nitrate mixture of 0.42LiNO3–0.58KNO3 doped by aluminum oxide nanosized powder....     

Magnetothermal emf of p-InSb Samples with High Temperature Gradient upon Uniaxial Strain

Russian Physics Journal -     

Axial-Vector Form Factor of Nucleons in the AdS/QCD Models

Russian Physics Journal - In the present paper, the axial-vector form factor of the nucleon is considered for the hard- and soft-wall models. Plots of the axial-vector form factor of the nucleon...     

Synthesis of epitaxial layers of zinc oxide on nonorienting substrates

The first experiments on the growth of single-crystal layers of zinc oxide on nonorienting substrates (crystalline leucosapphire and fused quartz) by chemical transport reactions in a reduced-pressure flow-through reactor in a hydrogen atmosphere is reported. To ensure autoepitaxy on a surface of a nonorienting substrate, an optimized intermediate layer of zinc oxide of thickness 200–1000 Å, which provides a texture of basal orientation regardless of the orienting properties of the substrate, is preliminarily deposited by magnetron sputtering. It is shown that the subsequent growth of layers on such a surface by a chemical transport reaction to a thickness of 1–5 ensures high structural perfection, uniformity, and a very smooth surface, while polycrystalline films are deposited on the portion of the surface without a buffer layer. The proposed method can be used to grow heteroepitaxial structures and other electronic materials on nonorienting substrates using chemical transport reactions.     

Atomic structure and high anisotropy of thermal expansion in NiSi single crystals. II. Temperature-induced structural changes

X-ray diffraction analysis of the atomic structure of NiSi crystals was performed by diffraction data obtained at 295 and 418 K. The temperature-induced changes in the bond lengths and valence angles were analyzed and the high anisotropy of thermal expansion of these single crystals was interpreted in terms of crystal chemistry.     

Spectroscopic study of solvation processes and ionic association in lithium salt solutions with ionic and aprotic solvents

The Raman spectra of the mixtures containing the low-temperature ionic liquid ethylmethylimidazolinium bis(trifluoromethanesulfonyl)imide (EMIIm), the salt component lithium bis(trifluoromethylesulfonyl)-imide (LiIm), and the aprotic solvent ethylene carbonate (EC) are studied. It is found that the addition of the lithium salt to the ionic liquid results in the formation of ion pairs or more complex cation-anion aggregates. Dilution of these systems with ethylene carbonate leads to the solvation of lithium ions.     

Phase composition and the structure of (1–<Emphasis Type="Italic">x</Emphasis>)KNO<Subscript>3</Subscript> + <Emphasis Type="Italic">x</Emphasis>Al<Subscript>2</Subscript>O<Subscript>3</Subscript> nanocomposites by X-ray diffraction

The phase composition and the structural properties of potassium nitrate KNO₃ and its heterogeneous composites with nanometer-sized powder of aluminum oxide Al₂O₃ have been studied by X-ray diffraction at various concentrations of an Al₂O₃ nanopowder. It is found that, in the (1–x)KNO₃ + xAl₂O₃ nanocomposites, additional high-temperature rhombohedral phase of potassium nitrate (phase III) with lattice parameters a = 5.4644 Å and c = 9.0842 Å. With increasing concentration of Al₂O₃ nanopowder, the content of the main potassium nitrate phase (phase II) is found to significantly decrease, and the relative fraction of the phase III in the total content of the nitrate in the composite composition increases. This phase is assumed to be “frozen” in the nanocomposite at the KNO₃–Al₂O₃ interface. The estimated size of KNO₃ crystallites in the phase III is more than 20 nm.     

Fabrication and some properties of ZnO/<Emphasis Type="Italic">A</Emphasis><Superscript>III</Superscript>N heterojunctions

n-ZnO/p-A ^IIIN (A ^III = Ga, Al) heterojunctions have been fabricated, which exhibit relatively strong electroluminescence in the blue-violet spectral range under forward bias. It is shown that ZnO layers grown with rf-discharge activation have a less developed surface with a significant decrease in the sizes and number of zinc clusters. The current-voltage characteristics of the heterostructures obtained have rectifying properties with a cutoff voltage corresponding to the ZnO band gap.