Materials Literature
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A novel approach has been described for the synthesis of zinc oxide nanoparticles by a very simple reaction of zinc metal with ethanol at 100oC. The diameters of the nano-particles range from 50–100nm. The reaction involves the cleavage of C-O bond of the alcohol, which occurs readily on zinc metal surface. Addition o…
The structure, mechanical and magnetic properties have been studied for Fe-Cr-Co-based hard magnetic alloys with W and Ga additives, subjected by the quenching and post-deformation hardening. The alloys combine the properties of the hard magnetic material with outstanding mechanical strength and plasticity. Using X-ra…
Differential thermal (DTA) and X-ray phase (XPA) analyses are used to study the ternary mutual system of Li, Ca//SO 4 , MoO 4 . Boundaries of crystallizing phases are determined. Compositions of the saddle and two invariant ternary eutectic points that melt at 709, 538, and 680 °C, as well as heats of phase transition…
Single-phase powders of manganites (La 0.65 Sr 0.35 ) 0.8 Mn 1.2 O 3 ± Δ with average crystallite sizes of 30, 50, and 500 nm were produced by co-precipitation. The samples studied were obtained by cold isostatic pressing of powders at a pressure of 1 GPa without subsequent sintering. It is shown that the size of part…
Electrospinning is an efficient technique for the fabrication of polymer nanofibers. The charges inside the polymer jet tend to repel each other so as to stretch and reduce the diameter of the polymer fibers. By rotating the collector at a fast angular speed, nanofibers with specific orientation can be obtained. In th…
The electrical transport in free standing porous silicon films formed from heavily boron-doped (110) Si wafers are investigated. The conductivity and photoconductivity of the films are shown to be significantly larger along the [110] in-plane crystallographic direction than that along the [001] one. The conductivity a…
A novel Mo – Si – B double-layer coating was prepared for the carbon/carbon ( C / C ) composites by pack cementation in an argon atmosphere. The structures of the double-layer coatings were characterized by XRD and SEM. The as-received coating shows an excellent oxidation resistance at high and intermediate temperatur…
Photoluminescence properties and optical absorption of the structures of silicon nanocrystals (nc-Si) in silicon dioxide matrix (SiO 2 ) are investigated in extended ranges of the excitation photon energy from 3 to 20 eV and the photon flux from 10 16 to 10 19 cm -2 . The experimental data are explained by considering…
The decarburization of liquid steel during hydrogen blowing has been studied. The decarburization is caused by the interaction of carbon with oxygen dissolved in the metal. As the melt is blown with hydrogen, the decarburization is enhanced owing to hydrogen bubbles, which increase the effect of mixing of a metal bath…
The "arc-in-liquid" method is a simple and inexpensive technique for the synthesis of carbon nanotubes and related nano-materials. In this paper, we report on the synthesis of carbon nanotubes by means of the arc-in-water method under microgravity and normal gravity conditions. The heat of convection and two-phase flo…
A facile method was developed for in situ formation of Co nanoclusters in sol–gel silica thin films spin-coated on Si wafers. The size and density of Co nanoclusters can be controlled by spin-coating speeds, annealing methods, reduction temperatures under H 2 , and metal precursor concentrations in tetraethylorthosili…
We have developed a new wet technology using electrochemical etching to remove ruthenium (Ru) film on the wafer bevels for back end of line (BEOL) processes of system LSIs. Ru films cannot be etched using conventional acidic solutions. However, an etching rate of 50 nm/min for Ru film is achieved using a diluted HCl s…
The solidification of two binary alloys, In-10Sn and Sn-13Pb, has been investigated by X-ray diffractometry (XRD) at high temperatures. The high-temperature X-ray camera, which was mounted on a diffractometer, had a sample holder suitable for molten metals and operated in a controlled Ar atmosphere. Melts were cooled…
RbAlO2-based solid solutions are synthesized in the systems Rb2 − x Al2 − x A x O4 (A = P, V). Temperature and concentration dependences of their conductance are studied; the rubidium-cationic character of the conductance is corroborated. The high ionic conductivity of the synthesized phases (∼5 × 10−3 S cm−1 at 300°C…
Co3O4 microspheres were synthesized by hydrothermal-precipitation method using NH3•H2O, H2O2, n-butanol and polyethylene glycol as precipitator, oxidant, assistant solvent and dispersant respectively. The products were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electrochemical…
This paper reports on the confined-chalcogenide phase change memory with thin metal interlayer (CCTMI) with the operating reset current of 0.6mA-30ns. This cell offers low reset current with simple architecture and fabrication. Thermal and heat flux distribution of both the normal-bottom-contact (NBC) and a proposed C…
Zinc ferrite (ZnFe2O4) is a commercially important material and has wide applications. We report the synthesis of nanostructured ZnFe2O4 and Fe-doped ZnO nanorods via a low cost, open to atmosphere self catalyzed Chemical Vapor Deposition(CVD) method which uses the Vapor-Liquid-Solid (VLS) Mechanism for growth. A mixt…
Thermoelectric power factors of nanocarbon ensembles have been determined as a function of temperature from 400 to 1200 K. The ensembles, composed of mixtures of nanographite or disperse ultrananocrystalline diamond with B4C, are formed into mechanically rigid compacts by reaction at 1200 K with methane gas and subseq…
In this work, the structural and magnetic properties of single-phase TbxDyyHoz(Fe,Co)2 (x + y + z = 1) alloys have been investigated by means of X-ray diffraction, 57Fe Mossbauer spectroscopy, magnetization measurements and a standard strain gage technique. The magnetostriction of TbxDyyHoz(Fe,Co)2 was examined agains…
Various copper(II) complexes as guests were immobilised among the layers of montmorillonite or on silica gel as hosts. Anchoring took place through hydrogen bonds and ion exchange for montmorillonite, while the forces of interaction were either hydrogen bonding or covalent bonds for the copper complex-silica gel nanoh…