Materials Literature
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Spectral changes in iron(11) complexes caused by temperature changes have been examined. When the iron(11) ion is surrounded by six equivalent ligands (FeC12, FeBr2, FeI2, FeSiF6,6H2O) the band separation that arises from the splitting of the 5Eglevel decreases on cooling. The variation is proportional to the magnitud…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of halogen, substituent, and solvent on spin delocalization in high-spin, five-coordinated 2,6-diacetylpyridinebis(N-alkylimine)nickel dihalidesGerd N. La Mar and Luigi SacconiCite this: J. Am. Chem. Soc. 1968, 90, 26, 7216–7223Publication Date (Print):December 1,…
Tokiti Noda, Michio Inagaki, Shigehiko Yamada; A Comment on the Structure of Glassy Carbon, Bulletin of the Chemical Society of Japan, Volume 41, Issue 12,
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and mechanism of the thermal decomposition of nickel tetracarbonylJ. Philip Day, Ralph G. Pearson, and Fred BasoloCite this: J. Am. Chem. Soc. 1968, 90, 25, 6933–6938Publication Date (Print):December 1, 1968Publication History Published online1 May 2002Published ini…
An exact formulation is presented for the release of metallic fission products. Such radioactive atoms are created through fission processes inside the kernel of fuel particles. They can diffuse through the coating of a fuel particle and the surrounding charcoal matrix into the structural graphite of the reactor core.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermochemistry and oxidation potentials of manganese and its compoundsT. A. Zordan and Loren G. HeplerCite this: Chem. Rev. 1968, 68, 6, 737–745Publication Date (Print):December 1, 1968Publication History Published online1 May 2002Published inissue 1 December 1968https://pu…
Abstract Results from previous work on clay-mineral complexes with dimethyl sulphoxide are taken as a starting point for the development of a method to identify kaolin in the presence of chlorite. The use of this method with artificial mixtures of these minerals, and with soil clays allows the detection of kaolin when…
Article The crystal structure of LiAlSi2O6 III (high-quartz solid solution) was published on December 1, 1968 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 127, issue 1-6).
Abstract High molecular weight aromatic polyketones were prepared from p ‐ and m ‐phenoxybenzoic acid in polyphosphoric acid by heating the reaction mixture at 100°C. High molecular weight aromatic polyamide was derived from the polyketone obtained through Schmidt reaction or Beckmann rearrangement. The polyamide obta…
Abstract Thin green clay layers and lenses in the lower part of the Lower Oligocene Kerkom Sand near Aardebrug, east of Louvain in Belgium, were found to consist of glauconitic illite. This mineral contains about equal amounts of iron and aluminium oxides (14%) and is therefore intermediate in chemical composition bet…
Huntite structure compounds with the formula REFe3B4O12 (RE = La3+, Nd3+, Sm3+, Eu3+, Gd3+, Tb3+, Dy3+, Ho3+ and Y3+) have been synthesized. X-ray powder diffraction patterns and cell parameter data are reported. The infrared spectrum confirms the triangular coordination of boron in these compounds.
1. The function of the wild-type alleles of the pleiotropic mutants cysB and cysE of Escherichia coli was investigated. 2. The wild-type allele cysB(+) is dominant to the mutant allele cysB in stable and transient heterozygotes. 3. The wild-type allele cysE(+) is dominant to the mutant allele cysE, as predicted. 4. Su…
The importance of accurate high-temperature thermodynamic data for the study of anharmonic effects in solids is discussed, and an adiabatic calorimeter for the measurement of heat capacities in the temperature range 25-500 °C is described. The precision of the heat capacity data is about ±0·1% for T < 400 °C and ±0·2%…
Thermally crystallized glasses of compositions (Li 2 ,O 2 , MgO).Al 2 O 3 .nSiO 2 were studied by X‐ray powder diffraction methods. High‐quartz solid solution phases developed at relatively low temperatures and, for n 3.5, transformed at higher temperatures to keatite solid solution phases. Associated phases, if prese…
The dislocation arrangement in the stress-applied condition of copper single crystals deformed in tension at 78°K was pinned by irradiating with a dose of 1018 n/cm2 fast neutrons at 4·2°K or 20°K. Transmission electron microscope studies of the primary glide plane showed that significant differences exist between the…
The acoustic properties of various types of commercial vitreous silica have been studied as functions of thermal treatment and impurity-ion concentrations. The properties studied include density, shear-wave attenuation, shear and dilatational wave velocities, and elastic constants. The measurements of acoustic propert…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new metal cluster system containing a cube of metal atomsL. E. McCandlish, E. C. Bissell, D. Coucouvanis, John P. Fackler, and Kerro KnoxCite this: J. Am. Chem. Soc. 1968, 90, 26, 7357–7359Publication Date (Print):December 1, 1968Publication History Published online1 May 2…
The high-temperature phase transition in KH2PO4 has been investigated by differential thermal analysis, thermogravimetric analysis, proton magnetic resonance and relaxation, infrared spectroscopy, and x-ray and quasielastic cold-neutron scattering. The transition is not connected with a static breaking up of the hydro…
Small-angle X-ray scattering is shown to be an effective technique, complementary to mechanical and thermal methods, for the study of structural ordering in polyurethane elastomers. Wide variations in intensity were found for different sample compositions and are interpreted in terms of the degree of hard segment aggr…
A number of techniques have been used to study structural organization and transitions in polyether- and polyester-based urethane elastomers. Scanning thermal methods reveal three characteristic transitions common to samples of varying composition, namely, the major glass transition and two higher transitions believed…