Materials Literature
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Diffusivity of Cu in amorphous (a-) Ta2O5 is increased by low temperature annealing above 350 °C but the increase is suppressed by adding SiO2 to Ta2O5. To clarify the reasons, we investigated the structural difference between a-Ta2O5 and a-SiO2–Ta2O5. The results show that the low temperature annealing does not cause…
Abstract The refractive index (RI) and Fourier transform infrared (FTIR) spectrum of a poly(vinyl chloride) (PVC)/polystyrene (PS) mixture were measured. The variation of RI with the mixture composition was found to be nonlinear, which indicated the immiscibility of the PVC/PS mixture. This result agrees with results…
Abstract Alumina toughened zirconia (ATZ) composites, combining a matrix of tetragonal zirconia polycrystals (TZP) and an alumina dispersion, are known for their high strength, toughness, and abrasion resistance. Depending on the type of stabilizing oxide in TZP the materials can be tailored to be either extremely str…
Carbon fiber reinforced aluminum matrix composite blocks and a pipe (as semi-product) were produced by pressure infiltration technique. In this paper the authors deal with the production method and investigations of the blocks and the pipe. In our composites AlSi12 eutectic aluminium-silicon alloy was used as matrix m…
Synthesis and magnetic properties of nanocrystals (size ≃22 nm) of cubic spinel MgMnO3 with the defect structure [Mg2+][Mg1/32+Mn4/34+◻1/3]O4 are reported. Analysis of the magnetization M versus T (2–370 K) and M versus H (up to 65 kOe) data shows a blocking temperature TB≃11 K and an estimated Néel temperature TN∼150…
Based on extensive integral-equation calculations and on complementary Monte Carlo simulations we have investigated the phase behaviour of a class of two-dimensional model systems where particles interact via short-range attractive and long-range repulsive potentials. While for a particular member of this class of sys…
We numerically examine dynamical heterogeneity in a highly supercooled three-dimensional liquid via molecular-dynamics simulations. To define the local dynamics, we consider two time intervals: ${\ensuremath{\tau}}_{\ensuremath{\alpha}}$ and ${\ensuremath{\tau}}_{\text{ngp}}$. ${\ensuremath{\tau}}_{\ensuremath{\alpha}…
Blumen für edle Vase gesucht: Die Schale des Edelmetallats [PdII7VV6O24(OH)2]6−, das aus sieben quadratisch-planaren PdIIO4-, vier tetraedrischen VVO4- und zwei quadratisch-pyramidalen VVO5-Addend-Einheiten besteht, bietet keinen Platz für Gäste. Seine Lösungsstabilität wurde mithilfe der 51V-NMR-Spektroskopie und der…
Abstract The influence of formation temperature on the ultradrawing properties of ultrahigh‐molecular‐weight polyethylene/carbon nanotube (UHMWPE/CNT) fiber specimens is investigated. Gel solutions of UHMWPE/CNT with various CNT contents were gel‐spun at the optimum concentration and temperature but were cooled at var…
A method is presented for preparing core-shell silica-polypeptide composite particles with variable and controllable shell growth. The procedure is demonstrated using poly(carbobenzoxy-L-lysine) and poly(benzyl-L-glutamate); after deprotection, these can lead to the most common basic and acidic homopolypeptides, poly(…
Abstract We have demonstrated directed self‐assembly of poly(styrene‐ b ‐dimethylsiloxiane) (PS‐ b ‐PDMS) down to sub‐10‐nm half‐pitch by using grating Si substrate coated with PDMS. The strong segregation between PS and PDMS enables us to direct the self‐assembly in wide grooves of the grating substrate up to 500 nm…
We show how the composition and the morphology of composite films deposited by one step chemical bath deposition (CBD) can be controlled by varying kinetic factors, in particular by selective nucleation, as well as varying the rate of growth of specific phases. ZnS/CdS composite films are obtained from a solution cont…
A novel one-step solvothermal synthesis of stable colloidal EuS nanocrystals (NCs) is reported. The EuS NCs were synthesized in oleylamine directly from europium oleate and diethylammonium diethyldithiocarbamate in the presence of dodecanethiol and phenanthroline. The formation of single crystalline monodisperse EuS N…
Given that half-metals are promising futuristic materials for spintronics, organic materials showing half-metal character are highly desirable for spintronic devices, not only owing to their weak spin-orbit and hyperfine interactions, but also their light and flexible properties. We predict that a two-dimensional orga…
We report direct evidence of interfacial states at the onset of $\text{O}\text{ }K$ edge confined to a spatial distance of 1 unit-cell full-width at half maximum at the sharp interfaces between epitaxial films of ${\text{LaMnO}}_{3}$ and ${\text{SrMnO}}_{3}$ from electron energy-loss spectroscopy (EELS) measurements.…
An IR absorption study is presented of a hydrogen defect in ZnO that gives rise to a local vibrational mode at $3326\text{ }{\text{cm}}^{\ensuremath{-}1}$ [M. D. McCluskey et al., Appl. Phys. Lett. 81, 3807 (2002)]. It is shown that a subband gap illumination results in the appearance of a new IR absorption line at $3…
Star polymers bearing vinyl-functionalized hyperbranched cores were successfully prepared at moderate-to-high monomer conversions ( ca . 80%) via a modified “arm-first” strategy. This was achieved by reversible addition−fragmentation chain transfer polymerization of a methacrylate type asymmetrical divinyl monomer wit…
Our experiments on ferroelectric aging of Al3+- and Ga3+-doped BaTiO3 ceramics reveal the crucial role of migration kinetics of point defects (oxygen vacancies) besides the thermodynamic driving force based on the symmetry conforming short-range ordering scenario. The doping with Ga3+ or tiny Al3+ ions shows the clear…
Nanoductility induced crack nucleation mechanism mediated by a single dislocation core is revealed in a 300 million-atom molecular dynamics simulation of shocked silicon carbide ceramic. The atomistic damage mechanism involves dynamic transitions between clearly delineated regimes—from shock-induced structural transfo…
Dissolution of [(CH(3))N](2)Na[MnN(CN)(5)]·H(2)O in water results in the rapid dissociation of the trans-CN(-) ligand to form trans-[MnN(H(2)O)(CN)(4)](2-)(aq), which reacts with monodentate pyridine ligands such as 3-methyl and 4-methyl pyridine to form the corresponding mono-substituted complexes, of which the molec…