Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The TiN(5 nm)/Al/TiN (5 nm) structure is fabricated by sequential sputtering for the diffusion barrier application against Cu diffusion. Al is used as an interlayer with an expectation that it will favor stuffing of TiN grain boundaries by reacting with O2 in the structure. In one phase of experiments, the upper TiN l…
Unterschiedlich katalytisch aktive Reaktionszentren auf getragenen Nanopartikeln konnten mithilfe von Molekülstrahltechniken und In-situ-Oberflächenschwingungsspektroskopie nachgewiesen werden. Am Beispiel der Methanolzersetzung an einem Pd-Modellträgerkatalysator (siehe Bild) wurde gezeigt, dass die konkurrierenden R…
(001)-Textured Cu2S Thin Films Deposited by RF Reactive Sputtering, He, Yunbin, Kriegseis, Wilhelm, Bläsing, Jürgen, Polity, Angelika, Krämer, Thorsten, Hasselkamp, Dietmar, Meyer, Bruno K., Hardt, Martin, Krost, Alois
The electronic and magnetic properties of the ferromagnetic half-metal CrO2 have been studied by using the full-potential linear muffin-tin orbital method within the local-spin-density approximation (LSDA) and the LSDA+U approach. The orbital magnetic moments are investigated by including the spin-orbit coupling in bo…
The nitronyl nitroxide 2-cyano-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (1) crystallises in the tetragonal P42(1)m space group with a=7.4050(7), c=8.649(1) A. In the crystal the molecules form layers parallel to the ab plane in which they are orthogonal to each other. In the layers there are close contacts, 2.953…
Density-functional calculations are used to study the electronic structure and transport properties of the type-I clathrates, K8Sn46, and K8Sn44□2, (□ is a missing Sn atom), and the type-III clathrate K8Sn25. We show K8Sn44□2 to be more stable than the defect-free K8Sn46, with K8Sn46 being metallic and K8Sn44□2; semim…
This paper reports the synthesis and characterization of a new class of diblock copolymers (co-oligomers), rod-rod conjugated diblock copolymers. A general synthetic strategy is outlined, and the structures of the copolymers (oligothiophene-co-oligophenylenevinylene) are fully characterized. It was found that these co…
An experimental phase diagram of the field-induced superconductivity in the lambda-(BETS)_2FeCl_4 compound is theoretically reproduced by a combination of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state and the Jaccarino-Peter mechanism. Semi-quantitative agreement is obtained in the presence of a very weak subdomin…
The thermoelectric properties of solid solutions of the type β-K2Bi8−xSbxSe13 (0<x<8) were studied with respect to thermal behavior, band gap variation, and charge transport properties as a function of x. At x values between 0 and 1.5, the energy band gap is observed to decrease (anomalous) before it wid…
Small flashes (b) occur during the freezing of triethylgallium samples in liquid nitrogen, and on warming from −196°C this is accompanied by decomposition (a). This effect was observed during the determination of the crystal structures of GaMe3 and GaEt3, which both show intermolecular interactions between their elect…
The ac conductivity and dielectric relaxation properties of silver selenomolybdate glasses, Y% AgI–(1–Y)%{MAg2O–F[0.4SeO3–0.6MoO3]} with varying dopant salt concentration, Y=20–80% have been investigated as a function of frequency and temperature. The dc conductivity is found to increase by more than two orders of mag…
Monoclinic Ga2O3 nanobelts and nanosheets are obtained by a simple chemical route involved with H2O at 950 °C in Ar atmosphere. Electron microscopy observations reveal that the as-synthesized Ga2O3 nanobelts and nanosheets are structurally uniform, single crystalline, and most of them are free of defects and dislocati…
Ion beam etching of sputtered Pb(Zrx,Ti1−x)O3 (PZT) with x equal to 0.54 thin films grown on Pt/Ti/SiO2/Si substrates has been performed using pure Ar gas. The etch rate dependence on the process parameters (current density, acceleration voltage, gas pressure) has been investigated. The PZT etch rate can reach 600 Å/m…
Cluster catalysts for directed oxygen transfer? In attempts towards the creation of novel catalytic systems for directed oxygen-transfer processes a novel type of polyoxometalate cluster containing vanadium was synthesized. The first example of a polyoxovanadate composed of a hexavanadate molecular center and two reac…
Synthesis of micropore-free hydrothermally stable mesoporous silica SBA-15 has been accomplished by templating a silica precursor (sodium silicate/tetraethylorthosilicate) with pluroni123 copolymer (EO20PO70EO20; M.W. 5,800) in the presence of cosolvent (ethanol) using a minimum salt (sodium chloride) content, under m…
The virial expansion of the collective mobility (sedimentation) coefficient is considered for hard sphere suspensions at equilibrium. The term of the second order in volume fraction, which involves three-particle hydrodynamic interactions, is calculated with high accuracy. To achieve that we represent the collective m…
Liquid-state integral equation methods are employed to study the thermodynamic and structural properties of ideal and repelling rigid rods mixed with hard spheres in the limits when one of the species is dilute. The role of rod aspect ratio and sphere/rod size asymmetry is explored over a wide range of system paramete…
We report a method to fabricate carbon nanotubes (CNT)/conducting polymer composite films for the application of CNTs to field emission displays. The composite was prepared by a combination of electrochemical polymerization of pyrrole and electrophoretic deposition of CNTs. We obtained a uniform CNT/conducting polypyr…
Beautiful offspring: Manganese/oxide/carboxylate-cluster chemistry continues to surprise with its rich variety of structural types. Here a new Mn21 cluster (see picture Mn4+ (red), Mn3+ (green)) with a 12 MnIII9 MnIV oxidation level and an approximately planar core is reported.
Progress reports are a new type of article in Advanced Engineering Materials, dealing with the hottest current topics, and providing readers with a critically selected overview of important progress in these fields. It is not intended that the articles be comprehensive, but rather insightful, selective, critical, opin…