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Besides ‘Li 2 Al’ which was recently shown to be the phase Li 9 Al 4 there exists the phase Li 3 Al 2 characterized by preparation and X-ray diffraction methods. It cristallizes with a rhomboedric unit cell, R3̄m, a = 4.508 Å, c = 14.26 Å and z = 3 formula units (hexagonal setting). The structure can be looked at as a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew cubic potassium antimony oxide derivative structure with interpenetrating networks. Crystal structure of bismuth gallium antimony oxideA. W. Sleight and R. J. BouchardCite this: Inorg. Chem. 1973, 12, 10, 2314–2316Publication Date (Print):October 1, 1973Publication Histo…
Cathodic polarization studies of crevices in Type 304 stainless steel and copper in 0.6M NaCl solution show that crevices with a distance to crevice opening ratio of 12,000:1 can be polarized and that the pH shifted in the alkaline direction to the domain on the potential-pH diagram (Pourbaix) where water is unstable…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic exchange interactions in transition metal dimers. II. Copper and nickel di-.mu.-azido and .mu.-oxalato complexesD. Michael Duggan and David N. HendricksonCite this: Inorg. Chem. 1973, 12, 10, 2422–2431Publication Date (Print):October 1, 1973Publication History Publi…
Abstract The water absorbency of a bleached softwood kraft pulp, as measured by its water retention value (WRV), was increased up to 30 times by graft polymerizing polyacrylonitrile (PAN) and subsequently hydrolyzing it to sodium polyacrylate–polyacrylamide copolymer. WRV was found to be related to the initial PAN gra…
The density fluctuations contributing to light scattering in a glass are governed by the flctive temperature of the glass and the equilibrium compressibility of the melt. Using ultrasonic velocity data for K 2 O–SiO 2 melts, these compressibilities were evaluated, and the magnitude of the density fluctuations were cal…
Exact renormalization group recursion formulas, derived in Paper I for $\ensuremath{\epsilon}=4\ensuremath{-}d$ small, are applied to antiferromagnets. It is shown, that in contrast to the ferromagnetic case, the main parameters characterizing the dipolar interactions become irrelevant for antiferromagnets, so that th…
Abstract The original samples of the magnetite series Fe 3 O 4 – γ Fe 2 O 3 of G.H ägg have been investigated with x-ray diffraction and Mössbauer spectroscopy. X-ray diffraction studies showed that the intensities of the superstructure lines increase with increasing deviation from the stoichiometric ratio. The patter…
Grain-boundary self-diffusion measurements over the temperature range 367–444°C have been made in polycrystalline Au using Au195 radioactive tracer and rf backsputtering technique for serial sectioning. The diffusion parameters are Qb = 0.88 eV and δDb0 = 3.1 × 10−10 cm3/sec which are discussed in relation to the poss…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of dithiolene complexes with amines. II. Formation and properties of mixed-ligand dithiolene .alpha.-diimine complexes of nickelThomas R. Miller and Ian G. DanceCite this: J. Am. Chem. Soc. 1973, 95, 21, 6970–6979Publication Date (Print):October 1, 1973Publication…
Abstract The critical strain ε c for crazing of polystyrene in each of a variety of organic liquids has been measured along with the degree of swelling of the polymer by the liquid and the attendant reduction in the glass transition temperature T g of the polymer. The critical strain for the crazing in air and the T g…
The intensity and spectral distribution of light scattered by K 2 O‐SiO 2 glasses (K 2 O content up to 40 mol%) were measured. The transverse and longitudinal sound‐wave velocities and the photoelastic constants were evaluated from the results. The total intensity of the scattering (and therefore the attenuation cause…
High-temperature viscous flow data are reported for three relatively simple organic liquids: o-terphenyl, salol, and α-phenyl-o-cresol. The results are combined with previous flow data on the same liquids to obtain viscosity-temperature relations over some 15 orders of magnitude. For each liquid, as well as for tri-α-…
The polymer crystal lamellar growth rate G is an often-measured property of semicrystalline polymers. In this paper, we investigate the dependence of G upon the length of the substrate, L, the surface nucleation rate of new growth layers per unit length per unit time, i, the velocity with which the growth layer covers…
Analytic features of the spectra due to excitation of a core electron in metal with an incomplete shell are studied with a simple model. The incomplete shell (denoted by d state, representatively) is treated as a nondegenerate localized state interacting with conduction band through the s – d mixing. It is assumed tha…
A fracture mechanics approach was used to investigate the high strength of hot‐pressed Si 3 N 4 . Room‐temperature flexural strengths, fracture energies, and elastic moduli were determined for material fabricated from α‐ and β‐phase Si 3 N 4 powders. When the proper powder preparation technique was used, α‐phase powde…
Paint has long been used for the protection of iron and steel against corrosion.
Abstract X-ray diffraction analysis of mixed alkylammonium-exchanged smectite revealed segregation of different ion species into randomly ordered layers. Vermiculite, however, showed segregation into crystallites, a behavior attributed to clay inhomogeneity. Ion segregation is explained by the hydration properties of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman spectra of thorium(IV) fluoride complex ions in fluoride meltsL. M. Toth and G. E. BoydCite this: J. Phys. Chem. 1973, 77, 22, 2654–2657Publication Date (Print):October 1, 1973Publication History Published online1 May 2002Published inissue 1 October 1973https://pubs.ac…
Abstract The Christiansen effect appears in the i.r. spectrum of powders embedded in a solid, liquid or air matrix as an apparently anomalous transmittance (Christiansen peak) of the incident electromagnetic radiations. The peak appears at wavelengths for which the refractive index of the sample and the refractive ind…