Materials Literature
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To synthesize various complex oxide materials and their solid solutions, we have applied a novel “meltsynthesis technique” rather than conventional solid-state reaction techniques. The synthesis of well-crystalline multi-component phosphor materials is sometimes difficult using conventional solid-state reaction techni…
Broadband Dielectric Spectroscopy as one of the major tools in molecular physics benefits from the extraordinary advantage that its sensitivity increases with decreasing thickness of a sample capacitor and hence with a decreasing amount of sample material. This enables one for instance to carry out broadband spectrosc…
Thermal degradation of a high-molecular-mass linear polymer is revisited for PE in terms of the theory of random ruptures. The polymer → gaseous products process is shown to proceed as a continuous sequence of chemical reactions accompanied by the occurrence of such physical phenomenon as evaporation of the formed fra…
The crystal structure of Pb6O[(Si6Al2)O20)] is investigated using X-ray diffraction. The compound has tetragonal symmetry, space group I4/mmm, a = 11.7162(10) Å, c = 8.0435(12) Å, and V = 1104.13(2) Å3. The structure is refined to R 1 = 0.036 for 562 unique reflections with [F 0] ≥ 4σF. The structure contains two symm…
In this paper, we present preliminary results based on experimental and numerical investigation concerning the influence of a grading ring on the wet-grown ice accumulation on two units of an EHV post station insulator, and on its critical flashover voltage during the corresponding melting period. Flashover voltage wa…
A new synthesis of μ-oxo dimeric iron(III) porphyrins from meso-tetraarylporphyrins in one-pot procedure is reported. μ-oxo dimeric iron(III) porphyrin was obtained in high yield (up to 93%) from the reaction of meso-tetraarylporphyrin with ferrous chloride in DMF at pH 8–11. Compared with other synthetic methods of μ…
Hugoniot measurements have been performed on high-purity cubic boron nitride polycrystals in the pressure range up to 296GPa using a two-stage light-gas gun. Hugoniot parameters have been measured by a line reflection method and Fabry–Pérot velocimetry. The Hugoniot elastic limit (HEL) is determined to be 44.3GPa, whi…
The fabrication and photoelectrical characteristics of suspended ZnO nanowire (NW) field-effect transistors (FETs) are presented. Single-crystal ZnO NWs are synthesized by a hydrothermal method. The fabricated FETs exhibit excellent performance. When V ds = 2.5 V, the peak transconductance of the FETs is 0.396 μS, the…
Ab initio studies are carried out for the atomic and electronic structures of the Zr-He system. It is revealed that zirconium undergoes a phase transition induced by helium. The most preferred position of the impurity in the metal lattice is determined. The energy of dissolution of helium and the excess volume introdu…
The dielectric and piezoelectric coefficients of lithium niobate (LiNbO3) and lithium tantalite (LiTaO3) single crystals have been theoretically calculated and experimentally measured for different cutting orientation directions. For LiNbO3and LiTaO3, the measured effective dielectric epsiv33and piezoelectric d33exhib…
This paper proposes a warm-up strategy for a Diesel Oxidation Catalyst (DOC) which is grounded on a simple distributed parameter model. This first principles model of the propagation of the temperature variations accounts for spatially distributed heat generation (due to chemical reactions). We show that heat generati…
4-(1-Benzotriazolyl)-5-[1(2)-naphthyloxy]phthalodinitriles were obtained by nucleophilic substitution of bromine and nitro group in 4-bromo-5-nitrophthalodinitrile. These compounds were used for the synthesis of the corresponding octa-substituted phthalocyanines. Spectral data of the compounds obtained were examined.
Carbon nanotube (CNT) growth on catalyst as a function of time, temperature, diameter of the CNT, damping factor of the system, and the type of catalyst is investigated via a theoretical analysis on the phonon vibration of the system. Simulations demonstrate that CNTs with larger diameter grow lesser owing to higher d…
Experimental data on the effect of stresses on magnetic properties of specimens made of ferromagnetic steel produced by a hot-rolling section mill at the JSC Magnitogorsk Metallurgical Works are reported. The coincidence of points of the sign reversal of the normal component of a stray magnetic field at the specimen s…
The thermal transformations of orthoboric acid at 100–105°C in a vacuum (15 ± 5 torr) were studied. The conditions of the formation of β-metaboric acid were determined; β-metaboric acid is a promising product for the preparation of organo-inorganic incombustible polymeric materials with high thermal stability, fairly…
Abstract The catalytic activity of WO3-promoted Ir/SiO2 for the selective reduction of NO with CO in the presence of excess O2 is strongly dependent on the catalyst calcination conditions in the preparation process. WO3/Ir/SiO2 catalyst prepared by air calcination showed higher activity than that prepared by H2 reduct…
Trifluoroiodomethane CF3I has been recently considered as a potential alternative to SF6, thanks to its high electronegativity and extremely low environmental effect. However, due to its high boiling point, CF3I should be mixed with other gases such as N2or CO2in order to avoid the liquefaction at low temperature. In…
A He-cooled divertor concept for DEMO has been pursued at Forschungszentrum Karlsruhe within the framework of the EU power plant conceptual study. The design goal is to achieve a DEMO-relevant heat flux of at least 10 MW/m2. The HEMJ (He-cooled modular divertor with multiple-jet cooling) was chosen as the reference co…
Single-walled nanotubes have been synthesized by arc discharge technique from C:BN:B 4 C catalytic mixture with an admixture of a typical Ni:Y 2 O 3 catalyst. Nitrogen and helium have been used as ambient gases. The arc current and voltage were varied in the process. The synthesized materials have been characterized b…
Abstract F‐montmorillonite (F‐MMT) was synthesized by a hydrothermal method at 493 K for 72 h, in which a little of hydroxyl radical is replaced by fluoride ion in the silicate structure. Poly(vinyl alcohol) (PVA)/F‐MMT nanocomposites were prepared using the synthetic F‐MMT by a solution‐intercalation method. The F‐MM…