Materials Literature
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The barrier performance and properties (resistivity, crystalline phase and surface microroughness) of tantalum nitride films, as well as the relationship between grain size and diffusivity of copper films, are reported. The resistivity and R a roughness of Ta2N film formed by reactive sputtering using argon and nitrog…
Within the four-particle cluster approximation for the proton ordering model, we study effects of external pressures which do not lower the crystals symmetry on deuterated ferroelectrics and antiferroelectrics of ${\mathrm{KH}}_{2}{\mathrm{PO}}_{4} $ family. The theory provides a satisfactory description of the availa…
Blended organosilicon precursors containing 10 or 20% of poly(vinylsilane) (PVS) in polycarbosilane (PCS) were prepared and shaped into fiber form by melt‐spinning. The influence of PVS addition on the spinning, radiation‐curing, and pyrolysis processes was investigated. The addition of PVS increased the spinability o…
The chemical state of analyte species collected on a water-cooled silica tube during atom-trapping atomic absorption spectrometric determination is investigated with the use of X-ray photoelectron spectroscopy (XPS) for Bi and Mn. Analysis of the Bi 4f 7/2 peak reveals that the chemical state of Bi is +3 during initia…
The effect of additions of vanadium with simultaneous additions of other carbonitride forming microalloying elements (Ti, Nb, Zr) or Al on the hardenability of steels of composition Fe–0·4C–1·5Mn–(0·004–0·021)N (wt-%) was investigated. Using a thermodynamic model, the composition of the austenite and the amount of und…
We report on the alignment transition of a nematic liquid crystal from initially homeotropic to quasi-planar due to field-induced anchoring breaking. The initial homeotropic alignment is achieved by Langmuir-Blodgett monolayers. In this geometry the anchoring strength can be evaluated by the Frederiks transition techn…
Models for the interaction of uranium silicide dispersion fuels with an aluminum matrix, for the resultant reaction product swelling, and for the calculation of the stress gradient within the fuel particles are described within the context of DART fission-gas-induced swelling models. The effects of an aluminide shell…
The spin-lattice and spin-spin NMR relaxation times ${T}_{1}$ and ${T}_{2}$ of ${}^{55}\mathrm{Mn}$ and ${}^{139}\mathrm{La}$ were measured as a function of temperature in several $(\mathrm{LaNa}){\mathrm{MnO}}_{3}$ perovskites, which are ferromagnetic and exhibit metallic conductivity. Exponential dependence was obse…
Silver nanoclusters in poly(methyl methacrylate) (Ag/PMMA) were prepared by bulk polymerization of methyl methacrylate with radical initiators in the presence of silver(I) trifluoroacetate (AgTfa), followed by a period of heating. To compare the influence of the type of radical initiator on the formation of Ag nanoclu…
We introduce a new method to determine the 'lattice offset' or 'rigid-body shift' between two crystals forming an interface. Our method relies on quantitative evaluation of high-resolution transmission electron microscopy images. Employing the (001)-orientated interface between Al and MgAl2O4 in parallel orientation a…
This paper describes an automated measurement system for core loss characterization. This system can accomplish these aims, within specified magnetic induction and frequency ranges, and at different temperatures, with high accuracy, due to the techniques used in the acquisition and computation of the waveforms involve…
A comprehensive modelling effort to analyse sputtering erosion and redeposition in the DIII-D/DiMES 70, 71 and 79 experiments using metal films (beryllium, vanadium, molybdenum, tungsten) on a carbon divertor probe has been performed. These materials were exposed at the outer strike point of an attached H mode plasma…
Single-crystal x-ray and electron diffraction studies established a direct relationship between lithium content, crystal structure, niobium valence, and the appearance of superconductivity in the system ${\mathrm{Li}}_{1\ensuremath{-}x}{\mathrm{NbO}}_{2}.$ The induction of superconductivity by removal of $x\ensuremath…
The fracture toughness of a commercial soda–lime– silica glass has been measured by the Vickers indentation method at four different indentation loads between 1·96 and 9·8 N and four different indentation times between 15 and 30 s. Indentation fracture toughness (IFT) values were calculated using 14 different formulae…
We reported the investigating results of the phase transition and phase structure for LaSc3(BO3)4 crystal. LaSc3(BO3)4 crystal exist three phases: high temperature phase a-LaSc3(BO3)4 with space group C2/c, medium temperature phase β-LaSc3(BO3)4 with space group R32 and low temperature phase γ -LaSc3(BO3)4 with space…
Synthesis of 11-cis-retinal analogues, of great importance in bioorganic studies of the photoreceptor of the visual transduction pathway, has been hampered by unusual difficulties in establishing the 11-cis geometry. However, a general and mild preparation of 11-cis-retinoids in high yield has been achieved by reducti…
A continuum model suitable for the description of microcracked bodies is shown. The influence of microcracks on the mechanical behavior of the body is estimated through a microstructural field added to the displacement one. This field represents the perturbation to the regular displacement field due to the presence of…
The common tetragonal form of KH 2 PO 4 undergoes two high-temperature transformations that have been studied extensively by vibrational spectroscopy. But, because these changes are strikingly heterogeneous, the previously reported spectra, averages over polycrystalline and single crystal domains, have remained ill-de…
Das kovalente Verankern von 1,4-Dimethyl-1,4,7-triazacyclononan an Kieselgel ist der erste Schritt bei der Herstellung eines heterogenisierten Mn-Katalysators. Wird H2O2 als Oxidationsmittel eingesetzt, so kann das Material die vicinale cis-Dihydroxylierung von disubstituierten Olefinen katalysieren, wie hier schemati…
Durch Umsetzung der Sesquioxide M2O3 der schweren Lanthanoide (M = Dy–Lu) mit SiO2 und CsCl als Flußmittel (molares Verhältnis 1 : 1 : 4; 700 °C, 7 d) in evakuierten Quarzglasampullen läßt sich die Reihe der Lanthanid-Oxidsilicate M2O[SiO4] im A-Typ (bisher bekannt mit M = La–Tb) bis hin zum Lutetium erweitern. Wichti…