Materials Literature
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Abstract Hellbernsteinfarbene Einkristalle von Na 3 AsS 3 kristallisieren kubisch, a = 8,57 3 Å; d rö = 2,52; d pyk = 2,47 g · cm −3 ; Z = 4. Die dreidimensionale Strukturaufklärung, 428 I 0 ‐Daten (0kl–4kl), MoKα, R = 6,9 und R′ = 7,6% für 428 von 443 möglichen Reflexen, zeigt, daß eine aufgefüllte Variante des NaClO…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe addition of alkyl halides to rhodium(I) dithiolene complexes. The synthesis, structure, and chemical properties of rhodium(III) acyl speciesChien-Hong Cheng, Bruce D. Spivack, and Richard EisenbergCite this: J. Am. Chem. Soc. 1977, 99, 9, 3003–3011Publication Date (Print…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of multifunctional triarylfluoroethanes. 1. Condensation of fluoro ketonesWilliam D. Kray and Robert W. RosserCite this: J. Org. Chem. 1977, 42, 7, 1186–1189Publication Date (Print):April 1, 1977Publication History Published online1 May 2002Published inissue 1 Apri…
Fission fragment tracks from neutron activation have been used to observe the alpha-emission-induced fragmentation in water of monodisperse particles of 239PuO2 of 0.30 μm geometric diameter into subparticles containing 60–10,000 plutonium atoms. The measured size distribution can be described by a power law relation…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of metal oxide catalysts by temperature programmed desorption. 2. Chemisorption of oxygen on copper(II) ion-exchanged Y-type zeolitesMasakazu Iwamoto, Kouji Maruyama, Noboru Yamazoe, and Tetsuro SeiyamaCite this: J. Phys. Chem. 1977, 81, 7, 622–629Publication Date (Pri…
Abstract The kinetics of the reaction of potassium phenyldimethylsilanolate (1) with the series of linear trimethylsilyl‐end‐blocked dimethylsiloxane oligomers and with the series of cyclic dimethylsiloxane oligomers was studied to clear some mechanistic problems of anionic polymerization of siloxanes. The results ind…
We measured the concentration of diatom frustules and amorphous silicon per gram of dry sediment at 5-m intervals in the upper water column (0–40 m), in sediment traps placed at 37 and 60 m below the surface, and in a sediment core. The average concentration of frustules per gram of dry suspended sediment in the water…
The electronic state of high spin MnAs was investigated by using the polarized neutron technique. The experimental results are summarized as follows: i) By analyzing the asphericity of the magnetic form factor with the free ion model, the numbers of electrons in the atomic levels are determined to be (1.0↑+0.3↓, 2.0↑,…
Single crystals of dilute iron alloys of the layer structures Nb${\mathrm{Se}}_{2}$, Ta${\mathrm{Se}}_{2}$, and Ta${\mathrm{S}}_{2}$ have been studied using measurements of magnetoresistance and Hall effect in magnetic fields up to 220 kG. Iron concentrations in the range 0-10 at.% can induce spin-exchange scattering,…
Liquid-crystal optical waveguides may be modulated or switched with high sensitivity by electrooptic, magnetooptic or acoustooptic effects. Such guides, however, have relatively slow response times and relatively high scattering losses so that they currently appear limited to special-purpose applications. A review is…
Abstract Thermal properties of normal and deuterated orthoboric acids were studied through the measurements of heat capacity in the temperature range from 13 to 370 K by using an adiabatic calorimeter and differential thermal analysis curves above room temperature. For both crystals, the heat capacity anomaly was foun…
The decrease in the superconducting transition temperature Tc after fast-neutron irradiation has been measured in V2Hf (C-15 Laves phase), Nb3Al (A-15 phase), PbMo6S7 (Chevrel phase), and SnMo5S8 (Chevrel phase). The samples were irradiated at 6 K and warmed to 300 K during transfer to the measuring cryostat. The Tc o…
Formation of the mixed oxide consisting of RuO 2 and TiO 2 was studied by the DTA/TGA technique and x‐ray diffraction. The coating agent containing RuCl 3 and tetra‐n‐butyl titanate converted into the mixed oxide of RuO 2 and TiO 2 at about 400°C on the Ti substrate, and the reaction was exothermic. The electric resis…
Raman scattering and infrared absorption measurements have been performed on amorphous Ge x Se 1- x with 0≦ x ≦0.4 and crystalline GeSe 2 . Molecular model is applied to explain the vibrational spectra of amorphous GeSe 2 . Variation of Raman spectra in Ge x Se 1- x glasses with Ge composition shows that local order i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganic reactions at alumina surfaces. 6. Isopropyl alcohol and diisopropylcarbinol on dehydrated alumina as reagents for very selective carbonyl reductionsGary H. Posner, Alfonse W. Runquist, and Marc J. ChapdelaineCite this: J. Org. Chem. 1977, 42, 7, 1202–1208Publication…
Abstract Mössbauer spectra of 15 smectites were investigated. In these samples, ferric iron occupies both M(1) and M(2) octahedral sites, the distribution being partly determined by the relative covalency of the bonds formed. The quadrupole splittings are linearly related to b −3 . They show that Fe 3+ octahedra are m…
Abstract The ring‐opening polymerization of unsubstituted lactones by Al 2 Zn and Al 2 Co(II) μ‐oxoalkoxides in homogeneous organic phase is described. Under these conditions, the chain propagation is very fast and proceeds without transfer or termination reactions. The composition and structure of the main products…
The energy levels of the chromium atom in all of its stages of ionization, as derived from the analyses of atomic spectra, have been completed. In cases where only line classifications are given in the literature, level values have been derived. The percentages for the two leading components of the calculated eigenvec…
When young people are at risk from being excluded from society this is usually caused by a number of factors. It requires that a number of different agencies work together in 'joined up' practice because different agencies have different areas of expertise. However, experience suggests that this is rarely done as effe…
Auger electron spectroscopy has been used to investigate the influences of p H, Cl − addition, and potential on the composition of passive films on Fe‐Cr‐Mo ferritic stainless steels. It was found that the improved corrosion resistance properties obtained by the addition of molybdenum cannot be explained by its enrich…