Materials Literature
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Magnesium alloy AZ91 (9 % Al, 1 % Zn, 0.2 % Mn in wt.%) with different reinforcements has been used to study fracture mechanisms and crack development. SiC particles and /or Saffil fibres were used as the reinforcement. Fracture surfaces of specimens prepared by impact tests in the temperature range from room temperat…
Characteristics of x-ray-induced absorption spectra in various types of synthetic fused silica (SFS) containing 0.1–77×1018cm−3 of OH were studied up to an irradiation time of 6 h. Induced absorption in the SFS spectra of irradiation with x ray from a Rh target with a dosage of 2×104Ckg−1h−1 was reproduced by six Gaus…
The interaction between two spherical particles coated by end-grafted polymers immersed in a good solvent is examined using the strong-stretching theory of Milner, Witten, and Cates. Our calculation allows the polymer chains to tilt outward from the axis of closest approach, where the separation between the substrates…
The objectives of this study were to investigate the mechanical properties of a ZrO2- Al2O3 composite ceramic. The mechanical strenght, wear behaviour and phase composition of the ceramic composite were analysed. The tested material showed a significantly higher bending strength compared to Al2O3- and ZrO2-Ceramic. Ac…
Magnesium cast parts as well as indirectly and hydrostatically extruded profiles were used in order to investigate the influence of different microstructures on the damping behaviour of magnesium AZ-alloys. Especially, hydrostatic extrusion leads to a significant grain refinement in the extruded profile compared to in…
Using the first-principles method, we calculate the atom and angular momentum resolved local moments in diluted GaMnAs, GaMnN, and CdMnTe. We show that the local moments are correlated with magnetic stability and can be explained by the occupation and hybridization of the host states with the Mn $3d$ states in both sp…
Nanobinary (Mg−Al) and ternary (Ni−Mg−Al) metal oxy/hydroxides were synthesized by aerogel protocol. The key features of this method are homogenization of metal organic precursors in methanol−toluene mixture, controlled hydrolysis, gelation, hydrothermal treatment, and finally supercritical drying of solvent. The obta…
The optical and structural properties of H or He implanted ZnO were investigated using low temperature photoluminescence (PL) and infrared spectroscopy (IR). H implantation is shown to influence the relative luminescence intensities of the donor bound excitons, enhancing the 3.361 eV peak, and changing the overall int…
The chiral fluorenol mesogen ( R )-2-(1-octyloxy)-7-((4-undecyloxybenzoyl)oxy)fluoren-9-ol (( R )- 3 ) was synthesized using a combined directed metalation-cross coupling strategy. The SmC* liquid crystal phase formed by the fluorenol mesogen is more stable and has a wider temperature range than that formed by the flu…
Oxygen chemisorption at metal surfaces has been shown through a combination of scanning tunnelling microscopy and photoelectron spectroscopy to involve transient states that provide low energy pathways for a wide range of surface reactions including the catalytic oxidation of ammonia and hydrocarbons. The kinetically…
Ceria-based ternary oxides are widely used in many areas of chemistry, physics, and materials science. Synchrotron-based time-resolved x-ray diffraction, x-ray absorption near-edge spectroscopy (XANES), Raman spectroscopy, and density-functional calculations were used to study the structural and electronic properties…
X-ray structure determinations of two different single crystals of octamethylferrocenium tetrafluoroborate (OMFc(+)BF(4)(-)) revealed conformational polymorphism with ligand twist angles of 180 degrees and 108 degrees , respectively. Their concomitant occurrence could be explained by the small lattice energy differenc…
Abstract 12‐Hydroxydodecanoate (HD) anions were intercalated, via an ion‐exchange procedure, onto a Mg/Al hydrotalcite‐like compound with the formula [Mg 0.65 Al 0.35 (OH) 2 ](NO 3 ) 0.35 ·0.56H 2 O. The obtained intercalate, characterized by chemical and thermal analyses, X‐ray powder diffraction, and Fourier transfo…
Two new types of silsesquioxanes, (HSiO 3/2 ) x [( t BuO)SiO 3/2 ] z or T H Q and (HSiO 3/2 ) x (RSiO 3/2 ) y [( t BuO)SiO 3/2 ] z or T H T R Q (R = octadecyl), were synthesized and studied as low- k dielectric materials for electronic applications. The materials were prepared by cohydrolysis and condensation of alkox…
The breakdown of the Schmid law in bcc metals has been known for a long time. The asymmetry of shearing in the slip direction 〈111〉 in the positive and negative sense, respectively, commonly identified with the twinning-antitwinning asymmetry, is undoubtedly one of the reasons. However, effect of stress components oth…
The present study has been aimed to combine the advantages of the two single-phase materials, Al2O3 and ZrO2 while avoiding their disadvantages, by producing a mixed ceramic. Within a study of an ATZ ceramic we tested the influence of aging by a hydrothermal treatment on the strength, phase composition and surface pro…
We report optical emission of SiC nanocrystallite films, which clearly shows the quantum confinement effect. Bulk polycrystalline 3C-SiC was first electrochemically etched and then the fabricated porous silicon carbide was ultrasonically treated in water or toluene suspension to disperse into colloidal nanoparticles.…
Large area highly uniform and ordered polypyrrole nanowire and nanotubearrays were fabricated by chemical oxidation polymerization with the help of a porousanodic aluminium oxide (AAO) template. Under 0.2 moL/L pyrrole (H2O) and 0.2 moL/LFeCl3 (H2O) pattern, polypyrrole nanowire arrays were obtained after 2.0 hourspol…
The occupancy of C-2 and S-6 sites by Eu3+, ions in nanocrystalline powders and microcrystalline ceramics of Lu2O3 prepared from these powders was studied by Mossbauer spectroscopy. It was proved that in nanopowders prepared by vigorous combustion syntheses the occupancy of the C-2 and S-6 sites by Eu3+, is almost ran…
We report on anisotropic magnetoresistance (AMR) and Hall effect measurements along the and [001] directions in a (110)-oriented La 2/3 Ca 1/3 MnO 3 thin film. While the electrical resistivity and the ordinary Hall coefficient are smaller for I along [001], evidencing some anisotropy of the Fermi surface, both the AMR…