Materials Literature
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Abstract Severe plastic deformation of pure Cu and Cu‐rich alloys was found to create a hierarchical combination of fast and ultra‐fast diffusion paths ranging from non‐equilibrium grain boundaries to non‐equilibrium triple junctions, vacancy clusters, nano‐ and micro‐pores, and finally to general high‐angle grain bou…
A new technological scheme has been developed for synthesizing nanocrystalline powders in the ZrO 2 -CeO 2 -Al 2 O 3 system. The powders have been used for preparing nanoceramic materials with an open porosity of ∼1%. The physicochemical properties of these ceramic materials have been investigated.
The unusual low field magnetic behavior is revealed in the dc and ac magnetic susceptibility measurements of Gd5(SixGe1−x)4 (x<∼0.5). These anomalies can be ascribed to the presence of short range ferromagnetic correlations and ferromagnetic clustering in both antiferromagnetic and paramagnetic states. As a res…
Abstract Bone fossilization is generally thought to be predominantly slow and geochemically controlled, whereas soft-tissue preservation is rapid and microbially enhanced. Microbial destruction of bone has been well researched, but potential preservational influences of microbes on bone are relatively unstudied. Build…
One dimensional (1-D) and three dimensional (3-D) ZnO were growth by a hydrothermal method. ZnO 1-D was employed as a support for silver nanoparticles in order to design a new catalyst and used on the steam reforming of methanol (SRM) reaction for H2 production. The catalytic activity of the Ag/ZnO sample with low con…
Raman spectroscopy is used for the study of SiO x (x ≈ 1) layers subjected to thermal annealing at the temperatures from 950 to 1200°C to form Si nanocrystals inside the layers. From comparison of the experimental data with the model of spatial confinement of phonons, the volume fractions of the crystalline and amorph…
The stability of synthetic REE-aluminate garnets irradiated by accelerated Kr2+ ions and affected by alpha decay of 244Cm (T1/2 = 18.1 yr) has been studied. The dose of irradiation sufficient for the complete disordering of the aluminate garnet structure is 0.40–0.55 displacements per atom. This value increases with r…
The possibility of synthesizing different crystalline modifications of alumina Al 2 O 3 by combustion reactions of a mixture of aluminum nitrate with glycine has been analyzed. Aggregated powders of γ-Al 2 O 3 that do not transform into the corundum structure after annealing at a temperature of 1000°C have been prepar…
An atomic carbon chain joining two graphene flakes was recently realized in a ground-breaking experiment by Jin et al. ( Phys. Rev. Lett. , 102 (2009) 205501). We present ab initio results for the electron transport properties of such chains and demonstrate complete spin-polarization of the transmission in large energ…
The reaction of 5,10,15-tritolylcorrole with EtMgBr opens the way for novel functionalizations of the corrole ring. DDQ oxidation of the macrocycle, followed by addition of the Grignard reagent, led to the formation of 5- and 10-alkyl substituted isocorroles in satisfying yields. Together with the one-pot formation of…
The details of the domain structure of the incommensurate antiferroelectric structure in La-doped zirconium-rich lead zirconate titanate have been revealed in detail for the first time. The structure is dominated by 60° domain boundaries close to {101} planes of the primitive perovskite cell; and tilts of the perovski…
Physical aging effects are shown to be typical of chalcogenide glasses with an under- or overconstrained network and to influence their physicochemical properties. The natural physical aging of glasses can be accelerated by gamma irradiation or exposure to light.
Dynamics of corona poling of three layer FEP/ePTFE/FEP sandwiches was analyzed theoretically. Thereby the temporal behavior of the involved electric fields, potentials and charges were obtained and compared to experimental data. From those results the optimal poling voltage providing the highest accumulated areal char…
The rapid growth dynamics of millimeter-tall, vertically aligned single-walled carbon nanotubes (VA-SWCNTs) was studied using a simple real-time monitoring method. By using combinatorial catalyst libraries, VA-SWCNT growth curves under various catalyst conditions were obtained in a single chemical vapor deposition (CV…
Titanium/silicon codoped hydrogenated carbon film was deposited on the n-Si (100) substrates by reactive magnetron sputtering Ti80Si20 target in a mixture of argon and methane. Microstructure of the film was investigated using x-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, Raman sp…
The surface structures of wurtzite ZnO (0001) and (000) surfaces are investigated by using a first-principles calculation of plane wave ultra-soft pseudo-potential technology based on density functional theory (DFT). The calculated results reveal that the surface energy of ZnO?Zn is bigger than that of ZnO?O, and the…
A comparative analysis of the Raman spectra of bulk PbS and PbS nanocrystals with average diameters of 6.6 and 3.8 nm has been performed. It is shown that the bands due to the LO phonons at the Γ point of the Brillouin zone dominate in the first- and second-order Raman spectra of the nanocrystals. Based on the analysi…
The effects of a demagnetizing field and an external static magnetic field on the effective Snoek’s product of textured Z-type hexagonal ferrite, which is the product of effective susceptibility and resonance frequency, were examined in order to apply the Z-type hexagonal ferrite to high-frequency devices. As a result…
Silica (SiO2) nanoparticles in different wt/wt% ratios were dispersed in a novel room temperature ferroelectric liquid crystal mixture. Dielectric relaxation spectroscopy (50 Hz–1 MHz) and electro-optic responses were investigated. Dielectric permittivity gradually decreases by about 40% up to 1 kHz with increasing Si…
Electric-field and/or temperature induced phase transitions were observed using polarizing light microscope on [100]-oriented Pb(Mg1/3Nb2/3)O3–0.3PbTiO3 (PMN–0.3PT) single crystals with electric fields applied along the [001] and [011] directions, respectively. The monoclinic (M) and tetragonal (T) phases were observe…