Materials Literature
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NaFeGe 2 O 6 polycrystals were synthesized and their x-ray diffraction, magnetic, electrical, and Mössbauer characteristics were measured. It is established that this monoclinic compound is a dielectric with a temperature of antiferromagnetic ordering of 15 K. The Mössbauer spectrum at 300 K is a quadrupole doublet. T…
In this study the magnetic properties and the structure of Gd5Ge1.8Si1.8Sn0.4alloy were investigated by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and magnetometry. The concentration of the Sn-doping in this study is four times that used in previous studie…
A technique employing electron beams generated by an open gas discharge is proposed for measuring the light efficiency of phosphor coatings of cathodoluminescent screens. The total light efficiencies of various phosphor coatings in the medium excitation energy range (ɛ < 7 keV) are estimated with allowance for both th…
The possibility of developing a model based on the concept of magnetic viscosity has been studied from the viewpoint of its ability to predict dynamic loop shape of different materials in both the voltage- and current-driven regimes. The applicability of the model to soft magnetic materials over a wide range of dB/dt…
Acoustic noise in inverter-fed motors can increase if resonance induced by magnetostriction occurs. This paper presents results of measurements of magnetostriction-induced mechanical resonance in nonoriented (NO) steels, commonly used in motor cores, under pulse width modulation (PWM) excitation. The resonant frequenc…
The Tl 2 MoO 4 -Ln 2 (MoO 4 ) 3 -Hf(MoO 4 ) 2 systems where Ln = La-Lu were studied in the subsolidus region using X-ray powder diffraction. Quasi-binary joins were revealed, and triangulation carried out. New ternary molybdates were prepared: Tl 5 LnHf(MoO 4 ) 6 (5: 1: 2) for Ln = Ce-Ho, Tl 5 LnHf(MoO 4 ) 6 (5: 1: 2)…
A method for determining the refractive index, size, and concentration of silica nanoparticles used as cores in synthesis of gold nanoshells is described. The average refractive index of silica nanoparticles, n = 1.475 ± 0.005, is determined by a modified immersion method, which involves spectroturbidimetry data in im…
The results of solving a scattering problem for the field of a cylindrical wave incident onto an isolated Veselago lens with finite dimensions or onto a system of three lenses are presented for the lens refractive index n r = −1 and loss parameter ν. The influence of geometric dimensions, the loss in the lens medium,…
A number of experiments were carried out to investigate the effect of moisture—which is always present in environmental air—on the graphite oxidation rate. A porous metal with 10-μm pores was used to enhance the humidification at the outlet of the vertical column that is full of water and is designed to increase the m…
Precipites in Cu-0.42%Cr-0.21%Zr alloy were analyzed by using scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDXS) and transmission electron microscope (TEM). After the solid solution was performed at 980 ℃ for 2 h, water-quenched and aged at 450 ℃ for 20 h, the precipite had a bimodal distr…
The molecular and crystal structures of two p -(alkoxybenzylidene)- p ′-toluidines C 5 H 11 O-C 6 H 4 -CH=N-C 6 H 4 -CH 3 ( 1 ) and C 8 H 17 O-C 6 H 4 -CH=N-C 6 H 4 -CH 3 ( 2 ), which form the nematic phase upon melting, is determined by X-ray diffraction. The geometry of the benzylideneaniline fragments in molecules…
Strontium ferrite (SrFe12O19) thin films have been deposited on thermally oxidized silicon wafer with Au underlayer by using DC magnetron sputtering system. Crystallization of the strontium hexaferrite phase on Au underlayer is achieved for deposition temperature as low as 475degC. The intensity of (111) diffraction l…
Polar phonons in infrared spectra of (Pb0.88La0.08 0.04)(Zr0.65Ti0.35)O3 ceramics and thin films exhibit similar behaviour. Each phonon allowed in perfect cubic lattice is split not only below the Burns temperature T B = 620 K, where it can be explained with breaking of cubic symmetry in polar nanoclusters, but also a…
This paper presents the results of the in-depth study of the Barkhausen effect signal properties for the plastically deformed Fe-2%Si samples. The investigated samples have been deformed by cold rolling up to plastic strain epsivp= 8%. The first approach consisted of time-domain-resolved pulse and frequency analysis o…
This study describes the preparation and characterization of Pu0.5Am0.5O2−x–MgO ceramic/ceramic (cercer) composites with 20 and 30 vol% of Pu0.5Am0.5O2−x. The sintered materials demonstrated very different reduction behavior when exposed to a reducing sintering cycle. The composites were studied by combined X-ray diff…
Novel catalytic systems for the cationic oligomerization of 1-decene into synthetic poly(α-olefin) oils have been worked out; these systems include a highly disperse (0.1–40 μm) aluminum, an aluminum activator [I2, Mg, (C2H5) n AlCl3 − n , (CH3)3CCl and some other RX, HCl, benzene, and toluene], and a cocatalyst based…
Fragilaria mesolepta Rabenh. was first described by Ludwig Gottlob Rabenhorst on the label to no. 1041 of his exsiccata, Die Algen Europas. The label provides collection information in addition to a description of the species and is accompanied by a small sheet with two figures. Among the various sets of the exsiccata…
Two types of granular catalysts for effective methane combustion in combustors of gas turbine plants (GTPs) were developed: (1) catalysts based on noble metals with a low Pd content (1–2 wt %), characterized by a low methane ignition temperature, and (2) catalysts based on manganese oxides and hexaaluminates, which ha…
Abstract In this work, the effect of processing conditions and nanoclay (NC) content on formation and various properties of polyamide 6 (PA 6) nanocomposites was studied by means of Taguchi method of experimental design. PA 6/organoclay nanocomposites were prepared by melt mixing of PA 6 at different organoclay loadin…
On the basis of the exact solution of the two-dimensional Poisson equation, a new analytical subthreshold behavior model consisting of the two-dimensional potential, threshold voltage, and subthreshold current for the single-halo, dual-material gate (SHDMG) silicon-on-insulator (SOI) metal oxide semiconductor field ef…