Materials Literature
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The complexes M2MnCl5(M = NMe4, NMe3H, Cs), M2MnCl5,H2O (M = NH4, K, Rb), and [Nme2H2]2 MnCl5,EtOH have been prepared and their properties compared with those of [NEt4]2MnCl5 and M′MnCl5(M′= phenH2, bipyH2); [NMeH3]2MnCl5 was difficult to isolate in a pure state. The complexes were characterized by magnetic measuremen…
Results of x-ray diffraction experiments investigating equilibrium structures of uranium-base substitutional alloys and routes of transitions between equilibrium structures are critically reviewed. Data on equilibrium alpha, beta, and gamma alloys are presented together with a resume of work on the crystal structures…
Crystals of the title 1:1 molecular complex are monoclinic, a= 7·32, b= 14·55, c= 10·88 Å, γ= 90·4°, space group P21/b, Z= 2. The structure has been determined from diffractometer data by direct methods and refined by least squares to R 0·064 for 1644 independent reflections. The dimensions of the component molecules…
The galvanostatic operation of flooded porous electrodes employing metal/metal salt couples is analyzed. A model is developed for a single, circular pore configuration which accounts for the effects of differing equivalent volumes of the solid reactants. The model also includes effects of variation in solution propert…
Abstract Thermodynamic interaction parameters have been calculated from gas–liquid chromatographic measurements for linear and branched polyethylene interacting with selected hydrocarbons. The values of the interaction parameter χ are substantial in spite of chemical similarities between the polymer and low molecular…
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THE RESULTS ARE REPORTED OF A SERIES OF UNIAXIAL COMPRESSION CREEP TESTS OF AN ASPHALT MIXTURE UNDER CONSTANT LOADINGS, MULTIPLE-STEP LOADINGS, AND REPEATED LOADINGS OF AS MANY AS 100 CYCLES. IT HAS BEEN SHOWN THAT THE NONLINEAR VISCOELASTIC BEHAVIOR OF THE ASPHALT CONCRETE CAN BE REPRESENTED BY A NONLINEAR GENERALIZE…
The e.s.r. spectra of the complexes M[N(SiMe3)2]3(M = Ti, Cr, and Fe) are reported and interpreted in terms of the effect of a large trigonal crystal field on the dn configurations. The ordering of the Kramers doublets for the chromium and iron compounds has been determined by depopulation experiments and substantiate…
X-Band e.p.r. spectra of magnetically dilute glasses containing (π-C5H5)2VX2 and (π-C5H5)2NbX2(X = Cl, SCN, OCN, and CN) have been recorded at 77 and 290 K and are analysed in detail. The metal-ion spin–orbit coupling constants, ξv and ξNb, for these molecules are estimated to be +133 and +490 cm–1 respectively. Spin…
Abstract A homologous series of aliphatic polyoxamides, nylon 122, 102, 82, and 62, were prepared by the bulk polycondensation of dialkyl oxalates with diamines. Infrared spectroscopy, x‐ray diffraction, differential thermal analysis, thermogravimetric analysis, and gas chromatography were used to study the structure…
Untersucht wird der Einfluss verschiedener Faktoren auf die Lösung oder die Fällung von Kaolinit, Quarz und Gibbsit nach Methoden der Thermodynamik und der anorganischen Chemie. Als Faktoren gelten Temperatur, Mineralkristallinität, pH, Kieselsäurekonzentration des Lösungswassers und Kohlendioxyddruck. Drei Möglichkei…
THE DETERMINATION OF A VALUE OF YOUNG'S MODULUS FOR THE BITUMINOUS-BOUND LAYER OF A PAVEMENT IS AN ESSENTIAL PART OF THE USE OF LINEAR ELASTIC THEORY IN PAVEMENT DESIGN. CURRENT PROCEDURES INVOLVE EITHER LABORATORY TESTING OR THE USE OF THE SHELL NOMOGRAPHS, NEITHER OF WHICH IS CONVENIENT FOR ROUTINE DESIGN CALCULATIO…
A new ferromagnetic ternary compound MnGaGe, isostructural with Mn2Sb, has been prepared by quenching from the melt and subsequent solid-state reaction. The metallic MnGaGe is tetragonal with lattice constants a = 3.966±0.001 Å and c = 5.885±0.001 Å. Magnetic measurements show that the Curie temperature is 185 °C and…
Pleochroic absorption and polarized fluorescence of guest molecules oriented in nematic liquid crystals were observed in the nematic phase and at the nematic-isotropic phase transition. The order parameters calculated from fluorescence intensities were found to be smaller than those calculated from the absorption coef…
The effects of very high neutron fluences on tensile properties and swelling of 300-series austenitic stainless steel were evaluated by destructive examination of several EBR-II thimbles that had accumulated fluences approaching 1.2 x 1023 n/cm2 (En > 0.1 MeV). Irradiation temperatures ranged from 370 to 470 C…
General data on the changes of the mechanical properties of metals and alloys during processing with pressure are reported. The basic methods of mechanical testing in the hot and cold state are also given. The effect of different factors on the changes of the mechanical properties in the process of plastic deformation…
Abstract The transport properties of gases and vapors in high barrier polymers and copolymers containing nitrile functionalities are discussed. The permeation behavior of oxygen, nitrogen, carbon dioxide, and water vapor are given in detail. Polymers containing methacrylonitrile as well as acrylonitrile units are incl…
The benzamide–succinic acid adduct (I) crystallises in space group P21/c, with Z= 2 in a unit cell of dimensions: a= 9·194, b= 5·116, c= 19·480 Å, β= 105·66°. The structure was refined from three-dimensional film data to R 0·10 (1441 reflections). The furamide–oxalic acid adduct (II) crystallises in space group P, wit…
The bond-energy bond-order (BEBO) model of chemisorption allows an estimate to be made of the interaction energy between a gaseous specie and a solid surface as a function of either bond length or bond order, i.e., the length or order of either the gas-surface bond being formed or the bond of the gaseous molecule bein…
Abstract Poly‐n‐hexyl isocyanate, prepared according to the method of Shashoua, was fractionated by a coacervation technique. Light scattering and osmometric measurements show that the molecules are enormously extended in solution and can be described in terms of the Porod‐Kratky worm‐like model. Dilute solution visco…