Materials Literature
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Abstract It is shown that the application of the so‐called Drude's rule in obtaining the k ≈︁ 0 longitudinal optic mode frequencies (LO's) of multi‐resonance damped oscillators is not correct, although it may be used as an approximate method only when a few oscillators, all of appreciable strength, are present. A rigo…
Abstract The morphological character of the surface region of polyethylene has been considered with respect to adhesion and adhesive joint strength. By melting polyethylene onto a high‐energy surface (e.g., aluminum) we have provided for extensive nucleation and the formation of a transcrystalline region in the polyme…
New data are presented for single crystals of Na0.33V2O5. Conductivity along the b axis follows a dependence of the form σT = A exp( − E / kT) with E = 0.067 eV below 140°K and E = 0.057 eV above 140°K. The Seebeck coefficient changes from − 225 μV deg−1 at 70°K to − 135 μV deg −1 at 150°K; thereafter, it remains cons…
Abstract Flammability determinations have been made for epoxy resin formulations. The oxygen index, defined as the volume fraction of oxygen in an oxygen/nitrogen atmosphere that is required just to sustain steady candlelike burning of a stick of the material, has been used as the measure of flammability. The formulat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid-state reactions of iron(II) hexacyanochromate(III)David Basset Brown, Duward F. Shriver, and Lyle Howard SchwartzCite this: Inorg. Chem. 1968, 7, 1, 77–83Publication Date (Print):January 1, 1968Publication History Published online1 May 2002Published inissue 1 January 1…
The heat capacity of uranium monosulfide was measured from 1.5° to 22°K by an isothermal (isoperibol) method and from 6° to 350°K by an adiabatic technique. The ferromagnetic transition at 180.1°K has a characteristic lambda shape and associated magnetic ordering entropy and enthalpy increments of 1.62 ± 0.2 cal °K−1m…
Description The papers in the Symposium on Metal Corrosion in the Atmosphere were given at the 70th Annual Meeting of the Society held at Boston, Mass., 25-30 June 1967. W. H. Ailor, Jr., Reynolds Metal Corp., and S. K. Coburn, U.S. Steel Corp., were the co-chairmen of this symposium sponsored by Committee G-1 on Corr…
The Symposium on Applications Related Phenomena in Titanium Alloys was presented 18-19 April 1967 in Los Angeles, Calif. ASTM Committee B10 on Reactive and Refractory Metals and Alloys sponsored the symposium. Hans Conrad, University of Kentucky, was the
The preparation and spectral and magnetic properties are reported for complexes of cobalt(II), nickel(II), and copper(II) with 2-methylimidazole (Mlz). The complexes (Mlz)2CoX2(X = Cl, Br, or I), (Mlz)2NiX2(X = Br or I), and (Mlz)2CuX2(X = Cl or Br) have tetrahedral structures whereas (Mlz)2NiCl2 has a polymeric octah…
Mössbauer spectra of compounds having the general formulae bis(1, 2-cyclohexanedione dioxime) iron (II) XY and phthalocyanineiron(II)(Z)2, where X, Y, Z represent ligands at the axial positions, have been measured at 77°K and in some cases at room temperature. The spectra consist of quadrupole-split doublets, from whi…
Abstract The spectrum of the fundamental absorption and reflection of n‐type InSe single crystals is studied in the energy region 1 to 5 eV and in the temperature range 293 to 90 ° K. In the spectrum an absorption is observed which may be related to direct and indicrect interband transitions. The main parameters chara…
The preparation and magnetic susceptibilities over the temperature range 80–300°K of eighteen iron(III)–Schiff base chloro- or bromo-complexes are reported. The complexes fall into two groups, uninuclear and binuclear. The magnetic data for the binuclear complexes have been interpreted by use of the dipolar coupling a…
Potentiodynamic polarization experiments were performed in 0.1 N hydrochloric acid and in 1 N sodium chloride with austenitic alloys containing 18 to 20% Cr, 13 to 39% Ni, 0 to 5% Mo, and balance Fe. The pitting potentials varied consistently with alloy content and correlated well with the results of exposure tests in…
The two long mean-lives observed for positron annihilation in some powders (Al2O3, MgO, SiO2) result from ortho-positronium formation. The longest mean-life corresponds to the triplet-state part that annihilates between the powders grains. Under vacuum, this annihilation is free and one observes the free triplet mean-…
Studies of the nitrogen, deuteron and proton relaxation rates of liquid acetonitrile at various temperatures were carried out by pulsed N.M.R. techniques. Re-orientation of the methyl group about its symmetry axis is found to be approximately ten times faster than the re-orientation of the nitrile group. Analysis of t…
This paper supplements the preceding paper by Maradudin and Vosko on the same subject. Extensions and additions include discussions of (1) the group of the bond, (2) tabulations of the time-reversal invariance criterion, (3) the labeling of experimental dispersion curves, (4) compatibility relations, (5) accidental de…
This paper reviews the extensive work pertaining to the creation of colour centres in alkali halides. After a brief historical survey the various mechanisms put forth to account for defect creation are examined in turn and the experimental evidence which supports or belies each of these is presented. After demonstrati…
Abstract The differences between compounds of carbon and of silicon are discussed, and the role of silicon as a fundamental structural component in inanimate nature is described. Starting with silicic acid and silicates, the structure and properties of the silicones and of compounds having SiCSi skeletons are descri…
G. Agnès, G. P. Chiusoli and G. Cometti, Chem. Commun. (London), 1968, 1515a DOI: 10.1039/C1968001515A
The kinetics of the reaction were determined on single crystal specimens by a gravimetric technique in the temperature range from 1000° to 1120°C at water vapor partial pressures from 1 to 20 Torr. Paralinear rate behavior was observed; i.e. , the reaction rate, which is initially parabolic, eventually becomes linear.…