Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon Monoxide Reactions. I. A Novel Synthesis of Acid ChloridesWarren A. ThalerCite this: J. Am. Chem. Soc. 1966, 88, 18, 4278–4279Publication Date (Print):September 1, 1966Publication History Published online1 May 2002Published inissue 1 September 1966https://pubs.acs.org…
rings, in which the Ge is tetrahedrally coordinated, linked through octahedrally coordinated Ge atoms to form a three-dimensional Ge-O network. All Ge polyhedra are linked by corner sharing. The Ba ions occupy positions in channels of the network.
The temperature, pressure, and time dependence of bulk density and the compressive strength of clay and boehmite compacts subjected to reactive hot‐pressing were determined. The strength and the bulk density are linearly related to the extent of the dehydroxylation reaction which occurs during reactive hot‐pressing. I…
The dissociation of dislocations in close-packed crystal structures reduces the flow stress, because the two partial dislocations do not pass simultaneously through the regions of maximum opposing stress. The component of the shear stress acting in the glide plane and transverse to the glide direction changes the widt…
The rate of dissociation of FeCO ~3~ to alpha -Fe ~2~ O ~3~ in air over the temperature range 25 degrees to 300 degrees C is practically independent of the initial amount of material and is a function of grain size and temperature. The order of reaction is approximately, but not exactly, one. The activation energy at…
A characteristic gel-like substance has been noticed around weathered pumice grains in the pumice beds of Kanuma near Utsunomiya and of Kitakami, Iwate prefecture. This substance was first studied by SHIOIRI (6) in 1934, and reported as allophane according to its chemical composition, refractive index, and dye-adsorbi…
Abstract The behavior of zinc benzothiazolyl mercaptide (ZMBT) and its complexes with amines and zinc carboxylates in effecting nucleophilic displacement reactions related to those which occur during accelerated sulfur vulcanization has been studied. Ligands influence the activity of ZMBT in nucleophilic displacement…
The rare earth metal (RE)-manganese alloys and compounds are interesting, especially with respect to their magnetic properties, since Mn is the first element of the 3d metals, which forms intermetallic compounds with RE metals. The preparation of such compounds by ordinary techniques is difficult, therefore the so-cal…
Dielectric and shear mechanical relaxation data are reported for mixtures of glycerol and n-propanol. Measurements of the dielectric permittivity were made at −60° over a frequency range from 50 cps to 600 kc/sec and indicate a distribution of dielectric relaxation times of the Davidson—Cole form. This distribution wa…
A detailed investigation of the scattering of a plane wave incident on a periodically stratified medium is presented. The periodic medium occupies the x > 0 region, and the stratification occurs along the z direction and is produced by a sinusoidal modulation of the dielectric constant. By choosing the polarization…
The solubility of sulfur trioxide in sodium silicate melts was determined from 1150° to 1250°C by equilibrating melts in gas mixtures of known contents of sulfur dioxide and oxygen. Sulfate forms according to the reactions: O 2‐ + SO 2 + 1/2O 2 = O 2‐ + SO 3 = SO 4 2‐ . The data obtained at 1200°C were interpreted by…
Surface structures produced during cleavage of magnesium oxide are described and interpreted in terms of the production and motion of dislocations. The usefulness and applicability of the nucleation decoration technique to obtain high-resolution micrographs of surface structures is presented. The observed surface stru…
The observation is made that a straight line with a slope of 1 is obtained when the two parameters of the Gibbs—DiMarzio theory are plotted against each other. The two parameters are Δε/k, the energy difference between the trans and gauche conformations of a hydrocarbon-type polymer chain, and 2α/k, the ``hole formati…
The solubility of water vapor at 750° to 1050°C was determined for alkali borate melts containing 0 to 40 mole % Li 2 O, Na 2 O, or K 2 O. In all cases the solubility in these melts is linearly proportional to the square root of the H 2 O partial pressure. At p H 2 O = 1 atm and T = 900°C, o.5 to 2.2 mole % H 2 O are…
The crystal structure of pascoite, Ca3V10O28.17H2O has been determined from Patterson and Fourier syntheses with the use of three-dimensional counter data for 1984 observed reflections.
The free-electron Boltzmann equation with elastic and isotropic bulk scattering is used to solve size effect problems in electrical conduction. It is assumed that the surface scattering is diffuse. Two cases are considered: 1. A conductor with rectangular cross section in zero magnetic field. The results are in good a…
Powders of several ceramic materials were subjected to explosive shock waves and changes in their physical properties were studied. Very fine particle sized SiC and B 4 C could be produced without introducing impurities. Strong line broadening in the X‐ray diffraction pattern of shocked powders was observed and correl…
Abstract Thermal conductivity phenomena in stretched amorphous high polymers are explained qualitatively and quantitatively using model concepts. Among other things, a relation is derived between anisotropy of thermal conductivity and linear coefficient of expansion.
Abstract Electrical conductivity and dynamic shear modulus measurements were made simultaneously on carbon black-filled natural rubbers. G ′, the in-phase shear modulus, and the electrical conductivity, G , were shown to vary in an approximately similar way as the amplitude of dynamic oscillation was increased. Both G…
A method is given for the measurement of the optical thickness of nonabsorbing dielectric films when it is inconvenient to apply an overlay film to measure the thickness by Fizeau fringe shift. The method is based on fringe-step displacements which have been observed in CdS films evaporated over reflecting metal films…