Materials Literature
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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…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew differential Bottcher-Onsager method used to determine polarizability and apparent radius of tungstosilicate (SiO4(WO3)124-)H. R. Petty, J. A. Crumb, V. E. Anderson, E. T. Arakawa, and J. K. BairdCite this: J. Phys. Chem. 1977, 81, 8, 696–703Publication Date (Print):Apri…
ABSTRACT The widespread acceptance of Glass Reinforced Plastic (GRP) Piping by industry has not been paralleled by Navy shipboard applications due to lack of technical information concerning performance characteristics of the material in the shipboard environment. The need for a corrosion—free, lightweight, low cost a…
The solid-phase infrared (0-4000 cm-1) and Raman spectra, and the gas- phase ultraviolet spectra, of phthalonitrile, terephthalonitrile and 2,6-dichlorocenzonitrile have been measured and an assignment made. The ultraviolet spectra of all three compounds, particularly terephthalonitrile, are rather diffuse. For phthal…
A fundamental law previously found in YIG, which relates the hysteresis losses to the magnetization state is generalized to Ni ferrite and to mixed NiZn and NiCd ferrites. The interpretation which is given is based on the domain wall size theory previously proposed by Globus : the energy lost by the continuous pinning…
Helium permeation, diffusion, and solubility have been measured for a number of lithium silicate and aluminosilicate glasses. Helium mobility in the lithium silicate glasses is controlled by the two-phase morphology of these glasses. Addition of as little as 2 mol% alumina strongly suppresses the tendency toward phase…
A 20%Cr-25%Ni-Nb steel subjected to mechanical working and precipitation strengthening was creep-tested at a temperature of 1073 K in the stress range 25–180 MPa. Coarse and fine NbCN precipitate distributions were investigated. At stresses less than that to bow dislocations between precipitates each alloy exhibited a…
R Srinivasan and S Parthasarathy Oxford: Pergamon 1976 pp xix + 248 price £11.25 Methods of crystal structure analysis continue to undergo refinement, obviously with the introduction of computer controlled multicircle single crystal diffractometers, but, in a more subtle way, by the application of probability theory t…
The spin-orientation diagram of ${\mathrm{Tb}}_{1\ensuremath{-}x}{\mathrm{Dy}}_{x}{\mathrm{Fe}}_{2}$ is constructed by $^{57}\mathrm{Fe}$ M\"ossbauer measurements and compared with single-ion calculations. The $4f$-crystal-field interaction dominates the magnetocrystalline anisotropy properties, though the presence of…
Exploratory studies of three polyelectrolytes containing several types of ionic species in different molecular environments were performed by dynamic mechanical, dielectric, and calorimetric methods. The materials were dimethyldiallyl-ammonium chloride (DMDAAC), 3-acrylamido-3-methylbutyl trimethylammonium chloride (A…
The room temperature modification of Ag 8 SiS 6 is orthorhombic, space group Pna2 1 , with α = 15.024, b = 7.428, c = 10.533 Å, Z = 4. A complete single crystal X-ray structure analysis shows the structure to contain tetrahedral SiS 4 (4-) units (Si-S 2.094(12) ... 2.130(12) Å) besides isolated sulfide groups coordina…