Torsion Effusion Determination of Sodium Partial Pressure Over Na[sub 2]O
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Magnetic anisotropy and second-order crystal fields in some tetragonally distorted tetrahedral cobalt(II) ions
The principal and average magnetic moments of Cs3CoX5 and (Et4N)2CoX4, [X = Cl, Br] have been measured in the temperature range 80–300 K. Magnetic transitions showing small hysteresis effects are found for both tetraethylammonium salts. The results are correlated with a point-charge model of D2d symmetry by use of the…
Ligand field spectra of some tris(1,3-diketonato)iron(III) chelates. Electronic repulsion parameters and the nephelauxetic effect
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLigand field spectra of some tris(1,3-diketonato)iron(III) chelates. Electronic repulsion parameters and the nephelauxetic effectAngelo M. Fatta and Richard L. LintvedtCite this: Inorg. Chem. 1972, 11, 1, 88–92Publication Date (Print):January 1, 1972Publication History Publi…
The Effect of Strain Rate, Temperature and Grain Size on the Lower Yield Stress and Flow Stress of Polycrystalline Pure Iron
The lower yield and flow stresses of polycrystalline pure iron specimens with a wide range of grain sizes from 10.3 μ to 102 μ were measured by tensile test at the temperatures between 77°K and 473°K at the strain rates from 10-7 sec-1 to 1 sec-1. The observed stress was decomposed into a friction part (al) and grain…
Precipitation Processes in Mg–Th, Mg–Th–Mn, Mg–Mn, and Mg–Zr Alloys
A study has been made of precipitation processes in selected magnesium-base alloys by means of electron microscopy. The principal part of the investigation was concerned with the effect of manganese precipitation in a Mg-Th alloy. It is shown that the sequence of precipitation in a Mg–2.0percnt; Th–1.0% Mn alloy (HM21…
The effect of a secondary process on the course of polymer crystallisation
Abstract The possibility that the presence of several processes occurring during the crystallisation of polymers may account for anomalous constant fractional values of the Avrami exponent is reconsidered, and for various reasons rejected. Experimental isotherms exhibit systematic variations when analysed as two stage…
Acid-catalyzed isomerization of thujopsene
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAcid-catalyzed isomerization of thujopseneGarry C. Kitchens, H. U. Daeniker, Alan R. Hochstetler, and Kent KaiserCite this: J. Org. Chem. 1972, 37, 1, 1–5Publication Date (Print):January 1, 1972Publication History Published online1 May 2002Published inissue 1 January 1972htt…
Clay Minerals of the Green River Formation (Eocene) of Wyoming
ABSTRACT: X-ray analyses indicate that illite, smectite, loughlinite (Na20.3MgO. 6SIO2.8H20) and chlorite are present in the < 2/zm fraction of the lacustrine Green River Formation (Eocene) of Wyoming. Material amorphous to X-rays and random mixed-layer structures are present in subordinate amounts. Individual…
Effects of Alloying Elements on the Pitting Corrosion of Aluminum
The effects of alloying elements on the pitting corrosion of aluminum in an 1N–NaCl solution have been studied by using binary aluminum alloys containing different amounts of alloying elements, Fe, Si, Cu, Mg, Mn, Ni, V, Cr, B, Zr, Ti and Be. Anodic and cathodic polarization curves, pitting potentials, pitting dissolu…
Corrosion of materials in surface seawater after 12 and 18 months of exposure, by Fred M. Reinhart and James F. Jenkins
A total of 1150 specimens of 189 different alloys were completely immersed in surface seawater for 12 and 18 months to obtain data for comparison with deep ocean corrosion data.Corrosion rates, types of corrosion and pit depths were determined.Some highly alloyed nickel alloys, titanium alloys, silicon cast irons, spe…
Creep and stress-rupture of high strength zirconium alloys
Zirconium-based alloys with small additions of tin, molybdenum, niobium and aluminum are being developed as candidate materials for high-strength pressure tubes in advanced CANDU reactors. The out-reactor creep and stress-rupture properties of 12 alloys based on these elements have been determined and correlated with…
Influence of crystallization conditions on single crystal formation
Abstract
Glass and other relaxations in liquids
The thermodynamics and relaxational behaviour of viscous liquids as they approach the glass transition can be duplicated by assuming quasi-independent units in the liquid of several hundred molecules, which below some characteristic temperature occur in potential energy minima. The form of the distribution of the numb…
Magnetic circular dichroism and absorption spectra of the porphyrins. Part I
We have measured the magnetic circular dichroism and absorption spectra of free base porphyrin, mono- and di-acid forms and a number of metalloporphyrins. Three of these, free base octaethylporphyrin, zinc and copper octaethylporphyrins have been studied in rigid media at liquid helium temperatures, the remainder as s…
Hydride orientation and tensile properties of Zr-2.5 wt% Nb pressure tubing hydrided while internally pressurized
An investigation was carried out to determine the orientation and the effect on tensile properties of hydrides precipitated in heat-treated Zr-2.5 wt% Nb tubing during the corrosion hydriding of internally pressurized samples. It was found that as the stress during hydriding was increased the hydrides gradually assume…
Mechanical and relaxation properties of polystyrene molded at high pressures
Abstract Atactic polystyrene glasses were molded at high pressures by cooling the polymer melt at pressures up to 5000 atm. Changes found in the properties of the samples included: a lower mechanical damping factor at temperatures from 50°K to 300°K; a higher compressive elastic modulus; a maximum in compressive yield…
Stress Corrosion Cracking of 18% Cr Ferritic Stainless Steels
Stress corrosion cracking of ferritic 18% chromium stainless steels in solution depends on nickel content (0–8%) as well as on heat‐treatment and cold work. Maximum susceptibility occurs at 2% Ni; alloyed manganese has a small effect; molybdenum can be detrimental. Rolling direction has little or no effect on failure…
Inhomogeneous swelling in filled elastomers
An exact formulation is given for the inhomogeneous swelling of an elastomeric matrix containing a spherical inclusion, and is presented in a form amenable to solution for arbitrary free energy of mixing and network strain energy functions, rigid or soft inclusions, and finite or infinite matrix size. Specific example…
Domain structure and bulk properties of solvent‐cast films of A–B–A block copolymers of styrene‐isoprene‐styrene
Abstract Domain structures of solvent‐cast films of A–B–A block copolymers of styrene‐isoprene‐styrene were studied by electron microscopy by use of the OsO 4 fixation technique. The effects of varying proportions of the two components and the casting solvent upon the domain structures were examined. It is concluded t…
Preparation and properties of gold atom cluster compounds: octakis-(triarylphosphine)enneagold trianion
A new series of gold cluster compounds has been identified. These are tri-univalent electrolytes, with the general formula (Au9L8)X3[L = PPh3 or P(C6H4Me-p)3, and X = NO3, PF6, pictate, or BF4, or ClO4].