Materials Literature
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A ferromagnetic semiconductor, rutile (Ti,Co)O2, exhibits anomalous Hall effect at room temperature. Strong dependence of the anomalous Hall effect, as well as the magneto-optic response, on the carrier concentration suggests carrier induced ferromagnetism in this compound. Both ferromagnetic responses are caused by t…
Here we employ both Fe K and L2,3 edge x-ray absorption near-edge structure (XANES) spectroscopy techniques to clarify that iron in the B-site ordered double-perovskite halfmetal, Sr2FeMoO6.0, possesses a mixed-valence state, FeII/III, and accordingly molybdenum a mixed MoV/VI valence state. A reliable interpretation…
In this paper, we describe the synthesis of tailormade cobalt and manganese oxides by a two-step preparation method. The first step consists of precipitating metal alkoxide powders from aliphatic polyalcohol solutions of salts. Their particle size, composition, and morphology can be independently tuned by controlling…
We analyze the energetics of spherelike micellar phases in diblock copolymers in terms of well-studied, geometric quantities for their lattices. We argue that the A15 lattice with Pm3;n symmetry should be favored as the blocks become more symmetric and corroborate this through a self-consistent field theory. Because p…
Auger rates are calculated for CdSe colloidal quantum dots using atomistic empirical pseudopotential wave functions. We predict the dependence of Auger electron cooling on size, on correlation effects (included via configuration interaction), and on the presence of a spectator exciton. Auger multiexciton recombination…
We propose a bond order potential for carbon with built-in long-range interactions. The potential is defined as the sum of an angular and coordination dependent short-range part accounting for the strong covalent interactions and a radial long-range part describing the weak interactions responsible, e.g., for the inte…
Transparent trilayered oxide films of ZnO/NiO/indium tin oxide were heteroepitaxially grown on a YSZ (111) substrate by pulsed-laser deposition combined with a solid-phase-epitaxy technique, and were processed to fabricate a p-NiO/n-ZnO diode. The diode exhibited a clear rectifying I–V characteristic with an ideality…
Ceramic fabrication processes - an introductory overview synthesis of powders powder characterization science of colloidal processing sol-gel processing powder consolidation and forming of ceramics sintering of ceramics - fundamentals theory of viscous sintering grain growth and microstructural control liquid-phase si…
Ungewöhnliche strukturelle und magnetische Eigenschaften charakterisieren neuartige gemischtvalente Co2+-Co3+-Oligooxocobaltate, die nach dem Azid-Nitrat-Verfahren zugänglich sind. In diesen Anionen besteht eine ausgeprägte Hierarchie der magnetischen Austauschwechselwirkungen (siehe Bild).
Results of molecular dynamics simulations on vibrational properties of zeolite ZSM-5-based amorphous solids are presented. The vibrational density of states was determined for different extents of amorphization. Amorphization is found to smoothen the density of states and leads to especially large effects in the high-…
Novel polyphenylene and polythiophene derivatives that have N,N ‘ -diphenyl-1,4-phenylenediamine (PDA) units were synthesized using the palladium-catalyzed Suzuki coupling or cross coupling. Each obtained polymer has good redox activity, and the polyphenylene derivatives have two redox couples in acetonitrile that con…
In-situ scanning tunneling microscopy (STM) has been used to follow the growth mode of gold clusters on TiO 2 (110) single crystals at room temperature on a cluster-by-cluster basis. Using carefully annealed TiO 2 (110) surfaces with a relatively low defect density it is possible to isolate cluster growth on step site…
In the present study, oxygen adsorption on the Cu-9 at%Al (111) surface under different temperatures was characterized in-situ by low energy electron diffraction (LEED) and X-ray photoelectron spectroscopy (XPS). Well-ordered ultra-thin alumina was formed when oxidation was carried out at 850 K. The rate of oxygen upt…
Quantitative analysis of Cu K-edge XANES spectra representing mixed states of two cuprous compounds was studied to determine the composition of copper species formed in the oxidative carbonylation of phenols. The quantification of two Cu(I) species, Cu 2 O and an unusual cuprous dibromide complex in the linear configu…
Abstract The specific reversibility of the crystallization and melting of linear and branched polyethylene has been determined as function of temperature by temperature‐modulated differential scanning calorimetry. The specific reversibility of crystallization and melting is defined as the ratio of the reversible entha…
We have built a newly designed 2D-photoelectron spectroscopy (PES) analyzer for the measurement of wide-angle photoelectron angular distribution patterns in the ultraviolet photoelectron spectroscopy (UPS) region with no distortion. The spherical electric field inside the analyzer is achieved by the 158 tin obstacle r…
Compounds 1 − 3, each possessing a long bent-rod shape and a central large dipole, were designed and synthesized as dopants which transform liquid-crystal smectic C phases to smectic C A phases. The properties and the layer structures of the dopant molecules in the mesophases were investigated by polarized light micro…
Calculations, based on exact solutions, of the viscous sintering of simple packings with unimodal and bimodal distributions of particle sizes with shrinking pores are performed. The case of square unit cells is considered in detail. It is found that, for the most part, pore shrinkage times have very weak dependence on…
Recently, the synthesis of a new phase of ${\mathrm{MoS}}_{2}{\mathrm{I}}_{1/3}$ stoichiometry was reported [M. Remskar, A. Mrzel, Z. Skraba, A. Jesih, M. Ceh, J. Dem\ifmmode \check{s}\else \v{s}\fi{}ar, P. Stadelmann, F. L\'evy, and D. Mihailovic, Science 292, 479 (2001)]. Electron microscope images and diffraction d…
Abstract The crystallization behavior of poly(ethylene terephthalate) (PET) with disodium terephthalate (DST) as nucleating agent was investigated. A detailed analysis of the crystallization course from the melt was made with the Avrami expression. The results demonstrated that DST additive can promote the PET crystal…