Materials Literature
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CeAsS crystallizes in the monoclinic group P2₁/b ; the unit cell dimensions are : a = 4.047 Å ; b = 5.616 Å ; c = 17.450 Å ; γ = 135.85°. There are four formulae per unit cell. The crystals are twinned by reticular pseudomerohedry. The structure (R = 0.093) is closely related to the antitype of Fe₂As. It shows compact…
Abstract Various substituents were added onto starch by means of esterification or etherification so that their effect on reactivity of starch with isocyanates in a nonpolar solvent could be studied. Maximum reactivity of the modified starches was achieved when the degree of substitution (D.S.) was about 0.7. Cured ur…
Abstract Solid-liquid equilibria were studied by a visual method in order to draw the polythermal pro-jections of the (Tl, Na, Li)NO 3 , (Tl, Na, Rb)NO 3 , and (Tl, Na, Cs)NO 3 ternary systems. The seven pertinent binaries are also discussed and data concerning the invariant points and crystallization regions are give…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSubstituent effects on the half-wave potentials of chalcones in dimethylformamideDavid W. Boykin Jr., Mary L. Ash, and Frank L. O'BrienCite this: J. Org. Chem. 1972, 37, 1, 106–110Publication Date (Print):January 1, 1972Publication History Published online1 May 2002Published…
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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…
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 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…
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…
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…
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…
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…
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…
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…
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…
Abstract
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…
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…
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…
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…