Materials Literature
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To study the physical origin of the non-ohmic behavior of WO 3 ceramics, the effects of heat treatment in different atmospheres on WO 3 varistors were investigated. Experiments showed that there was a dependence of the nonlinear coefficient on thermal treatment under different atmospheres. Thermal treatments in argon…
The crystal structure of a low-temperature modification of the Li 12 Zn 4 (P 2 O 7 ) 5 compound has been determined by full-profile analysis from the X-ray powder diffraction data. The compound crystallizes in the monoclinic crystal system ( a = 5.130(1) Å, b = 13.454(1) Å, c = 8.205(1) Å, β = 90.36(1)°, space group P…
The electrical properties (loss tangent (tanδ), real (ɛ) and imaginary (ɛ″) parts of complex dielectric permittivity, and ac conductivity across the layers (σac)) of (TlGaS2)1 − x (TlInSe2) x (x = 0.005, 0.02) layered single crystals have been studied in the frequency range f = 5 × 104 to 3.5 × 107 Hz. The results dem…
Lead-free (1- x )(Na 0.5 K 0.5 )NbO 3 – x Ba(Ti 0.9 Sn 0.1 )O 3 ceramics doped with 1 mol % MnO 2 [(1- x )NKN– x BTS] were prepared by the conventional solid state method and their structural and piezoelectric properties were investigated. The (1- x )NKN– x BTS ceramics were well synthesized and a dense microstructure…
The process of generation of X-ray radiation formed during the free exit of a fast stream of water in a state of cavitation from a narrow channel was investigated both experimentally and theoretically. It was observed for the first time that the initial part of the stream and the outlet of the channel are the sources…
Here, we show that the conventional concept of using SiO 2 -patterned Si substrates to selectively grow three-dimensional (3D) carbon nanotube structures can also be applied to dip coating. Patterned growth of high-quality vertically aligned single-walled carbon nanotubes (SWNTs) can be easily obtained by this protoco…
Superparamagnetic Iron Oxide Nanoparticles (SPIONs) prepared by simplified coprecipitation were attractive as MRI contrast agents and drug carriers which could internally be manipulated under the influence of an external magnetic field and also cancer treatment due to additional hyperthermia effects. Problem statement…
Calcined Mg, Ni, Cu, Co, and Zn hydrotalcites (CHTs) tested for their catalytic performance in the side chain ethylation of toluene with ethanol at 300, 350, 400, and 450°C. The major products were propylbenzene, β-methylstyrene, ortho -, para -, and meta -ethyltoluene. MgAl-CHTs gave side chain alkylated propylbenzen…
At the room temperature, a novel and environmental friendly approach for synthesizing polyaniline (PANI) nanofibers on a large scale is presented firstly in the aqueous phase by ultraviolet (UV)-assisted polymerization using cetyltrimethylammonium bromide (CTAB) as the "soft-template." It is obvious that the polymeriz…
The evolution of small perturbations of the spherical shape of a vapor bubble in the process of its single strong expansion and compression in deuterated acetone is studied. In the mathematical model used the motion of vapor and liquid is broken down into the spherical component and its small nonspherical perturbation…
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The magnetic properties, temperature dependences of the resistivity, Hall constant, and magnetoresistance of epitaxial zinc oxide films doped with cobalt are studied. The ferromagnetism of the films is observed at room temperature. The conduction and magnetoresistance of the films are attributed to transport of electr…
A high speed in acquisition of backscatter Kikuchi patterns (BKP) and solving the stored raw patterns offline has many advantages over online EBSD. No compromise is made between speed and reliability. Automated backscatter Kikuchi diffraction in the scanning electron microscope (SEM) is about to become a tool for proc…
Various equal channel angular pressing (ECAP) regimes by routes A and Bc were applied to a commercial MA2-1 (Mg-5wt.%Al-1wt.%Zn-0.4wt.%Mn) alloy for the development of texture which is different from the one of conventionally extruded and annealed alloy. In order to avoid the grain-size effect, the ECAP-processed allo…
Ternary Al2O3-ZrO2-Y2O3 samples with a eutectic composition were prepared using the rapid quenching method, with some samples further annealed at 1300°C for 30 min and then slow cooled. The microstructural evolution was observed with XRD, SEM, and TEM. The SEM and TEM observations of the ternary samples agreed with th…
Using the magnesium-fluoride-single-walled-nanotube model system as an example, the strength and spectral features of the indicated structure are briefly considered for laser deposition of carbon nanotubes oriented in a 100–200-W∕cm electric field. The calculated result is given for the ratio of the forces needed to b…
While our awareness towards sustainable society and environment grows, the importance of `green' materials and manufacturing is gaining significant recognition. We have demonstrated that naturally-occurring fibers as renewable raw materials can be converted into nanoparticles and nano fibers using simple top-down meth…
Abstract Thermodynamic prediction based on a two-stage simulation has been carried out to investigate the composition range of Mg–Al–Ca alloys amenable to semi-solid forming. The results show that increasing the solute elements decreases the temperature sensitivity, but their effects on the solidification range are gr…
An example of selecting carbon fibers with such physicomechanical characteristics which provide increased rigidity without a considerable rise in the price of the constructions when being introduced into the structure of glass-reinforced plastic profiles is described. The technical requirements of carbon fibers are fo…
This paper presents the results of investigations into the structure and the magnetic properties of powders consisting of Co nanoparticles in the matrix of a high-porous amorphous carbon material. An analysis of X-ray diffraction and nuclear magnetic resonance spectra revealed the presence of hcp and fcc phases of cob…