Materials Literature
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The X-band electron paramagnetic resonance spectra of Cu+ + ions doped into amorphous, tetragonal, and hexagonal GeO2 have been observed at 295°K. Optical absorption and reflection data for, respectively, the doped glass and polycrystalline samples were also obtained. From the experimental results, the symmetry of the…
The radical ions SO4− and S2O3−, trapped in γ-irradiated K2SO4 and Na2S2O3·5H2O crystals, respectively, have been identified by their ESR spectra. In the preceding paper molecular orbital calculations were described the results of which predict a ···1t163t262a1, 2A1 (symmetry Td) configuration for SO4− and a ···5e45a1…
The Raman and infrared spectra of the aluminate ions in alkaline solutions have been measured. Two ionic species, one predominant from pH 8 to pH 12 and the other predominant above pH 13, may be identified from the spectra. At intermediate pH's both forms are present. The selection rules and the polarization of the li…
The radial and longitudinal development of electron-photon showers has been measured in copper and lead at 1 GeV. A new technique using the thermoluminescent property of LiF has been employed to measure energy deposition. The resultant radial distributions and transition curves show good agreement with Monte Carlo cal…
The characteristics of phonon-terminated coherent oscillation associated with ${\mathrm{Ni}}^{2+}$, ${\mathrm{Co}}^{2+}$, and ${\mathrm{V}}^{2+}$ ions in rutile and perovskite fluorides are described. Continuous tunability over portions of the vibronic continuum of ${\mathrm{Ni}}^{2+}$ in Mg${\mathrm{F}}_{2}$ has been…
Abstract In agreement with the results of dynamic experiments of Stratton and Ferry, this study of relaxation of rubber vulcanizates entirely confirms the existence of peculiar, slow, viscoelastic processes in high polymer networks. Characteristic differences with the rheological behavior of unvulcanized polymers are…
Abstract Measurements of Young's modulus of vulcanized rubbers containing thermal carbon black show the predicted dependence on the volume concentration given by relationships derived for a suspension of spherical particles, for example, that due to Guth, Simha, and Gold which gives E=E 0 (1+2.5c+14.1c 2 ) . A simple…
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…