Materials Literature
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Abstract Fibre reinforced ceramic components are most efficiently produced by the braiding technique. Since the braiding angle can be adjusted during the preform fabrication process in a wide range as required by the loading situation of the composite, the evaluation and prediction of the elastic properties as a funct…
In Southern Africa, the medicinal plant Warburgia salutaris is commonly used for the treatment of inflammatory and other diseases. The methanol extracts of W. salutaris were investigated with regard to a) production of proinflammatory cytokines tumor necrosis factor-alpha, interleukin-1beta, and interferon-gamma; b) a…
High frequency ultrasonic transducers were fabricated using lead indium niobate-lead magnesium niobate-lead titanate (0.24PIN-0.44PMN-0.32PT) as the active piezoelectric material. The measured center frequency and bandwidth of the device were 35 MHz and 48 % respectively. The electrical impedance magnitude was 71 Omeg…
In this paper the current transport mechanism of ZnO-based metal-semiconductor-metal ultraviolet photodetectors with various contact electrodes is discussed and simulated. The simulation is based on the thermionic emission theory and tunneling effects. It was found that the lowest dark current attributes to the Ru con…
In this paper, we have developed the flexible polyimide based magnetostrictive multibody actuators and investigated the magneto-mechanical characteristics of TbFe/Ni/TbFe layered thin film sputtered on the polyimide substrate with different thickness ratios for micro devices. The developed actuator is operated by magn…
Magnetoresistance of cobalt-doped zinc oxide and cuprous oxide ferromagnetic nanoparticles with different cobalt concentrations are studied. Zeeman splitting effect is found to play a key role in the electrical transport of our cobalt-doped oxide ferromagnetic nanoparticles. We emphasize that the existence of large Ze…
In an attempt to develop anisotropic high-temperature permanent magnets consisting of Sm2(Co,Fe)17grains separated by thin layers of a nonmagnetic phase, small amounts of Ag, C, Ga, In, and Sn were added to the Sm2Co17-based alloys and sintered magnets. Grain-boundary phase(s) with the melting temperature of 985-1070d…
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…