Materials Literature
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The synthesis and crystal chemistry of six new complex palladium oxides are described. The black PbPdO 2 has been tentatively indexed on a hexagonal basis with a 0 = 10.902A and c 0 = 4.654A. Sr 2 PdO 3 is body-centered orthorhombic with a 0 = 3.970A, b 0 = 3.544A, and c 0 = 12.84A; the structure proposed for this com…
Abstract Native celluloses of various biological origins, as well as regenerated celluloses were examined by electron microscopy after suitable dispersion. In all cases the specimens were found to be composed of a common filamentary unit which is rectangular in cross section and has the approximate dimensions 35 × 20…
The photoelectric yield and photoelectron energy distributions have been measured on Rb and Cs in the photon energy range 2. 0-11. 2 eV. These results and the trends across the series Na, K, Rb, Cs are compared with the predictions of the three-step volume model. The energy distributions show evidence of scattering by…
The defect structure in α-titanium and rhenium irradiated with neutrons at 0.4T m (T m = absolute melting temperature) has been analyzed using transmission electron microscopy. In rhenium, the vacancies agglomerate into voids whereas in titanium, vacancy dislocation loops lying on the prism planes are the only vacancy…
Abstract— Octaethylporphinato‐magnesium (MgOEP) has been photooxygenated in quantitative yield to a brown compound with its main absorption peaks at 825 and 408 nm. The product has been isolated and evidence suggests that it is 4‐formyl‐5‐oxa‐octaethylporphinato‐magnesium II. II is very labile to hydrolysis, the main…
Dihydrolipoyl transsuccinylase, one of the three enzymes comprising the Escherichia coli 2-oxoglutarate dehydrogenase (EC 1.2.4.2) complex, has been crystallized. Studies by x-ray diffraction and electron microscopy establish that the transsuccinylase has octahedral (432) symmetry, i.e., it consists of 24 subunits tha…
Abstract Studies have been made of the secondary relaxation processes in the solid state of a number of polymers containing aromatic groups in the polymer chain. The polymers investigated include one, polystyrene, with the aromatic group in side‐chain positions, and six high polymers in which phenylene rings lie in th…
Corona discharge results, obtained with a number of gases under atmospheric pressure using plane-parallel metallic and dielectric electrodes placed between 0.05 and 9.00 mm apart, are discussed. With short gap spacings, deviations from the pulse or spark-type discharge mechanism are observed to occur in particular whe…
A number of new families of titanium and mixed titanium plus chromium oxides has been discovered, their structures all being derived from the rutile type by crystallographic shear. Different families have different CS planes (hkl), and the members of a family are distinguished by the spacing of these planes. All the s…
The problem of d-electron delocalization has been investigated in the pyrite system Ni(S1-x , Se x )2 and this is related to the (V1-x , Cr x )2O3 corundum system. High pressure resistivity measurements have confirmed the existence of a metal-insulator transition.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCalculation of bridgehead reactivitiesP. V. R. Schleyer and R. C. BinghamCite this: J. Am. Chem. Soc. 1971, 93, 13, 3189–3199Publication Date (Print):June 1, 1971Publication History Published online1 May 2002Published inissue 1 June 1971https://pubs.acs.org/doi/10.1021/ja007…
Measurements of the Knight shifts of ${\mathrm{In}}^{115}$, ${\mathrm{Ga}}^{69}$, ${\mathrm{Ga}}^{71}$, ${\mathrm{Sb}}^{121}$, ${\mathrm{Sb}}^{123}$, and ${\mathrm{Te}}^{125}$ in solid and liquid ${\mathrm{In}}_{2}$${\mathrm{Te}}_{3}$, ${\mathrm{Ga}}_{2}$${\mathrm{Te}}_{3}$, and ${\mathrm{Sb}}_{2}$${\mathrm{Te}}_{3}$…
Calculations of the properties of some lattice models and continuum models of a hard rod liquid with and without attractive energies are presented. The theory is of the “molecular field” variety in that short-range-order is neglected. Both the long-range-order parameter and the density are varied to obtain the state o…
Conductivity and dielectric properties of semiconducting glass of composition 80% V2O5:20% P2O5 have been measured as a function of frequency from dc to 3.6 GHz over a temperature range from 77°K to 420°K. A fit of the dc results to a model of polaronic hopping conduction leads to an activation energy due to disorder…
Orthogonal magnetic quadrupole lens systems that could serve as electron microscope objectives are treated theoretically. After certain constraints are placed on the quadrupole field strength, the calculus of variations is applied to obtain systems with minimum chromatic aberrations. A digital computer was used to cal…
Absorption, fluorescence and decay-time measurements are presented for calcium metaphosphate glass containing tin or antimony. The bands observed have been assigned to the 1 S 0 -> 3 P 1 transition (A band) of the ions Sn 2+ and Sb 3+ . It is suggested that the splitting of the A band may be due to a dynamic Jahn-Tell…
The dry distillation method was studied for rapid separation of 99mTc from neutron irradiated MoO3. Upon heating, 99mTc produced in MoO3 crystal by the 98Mo(n,r)Mo99m β→ 99mTc process was found to be released by diffusion. From observations made of the deposition temperature, it was concluded that 99mTc was present in…
The boundary-value problem for a constrained elastic cylinder under axial load is solved for the correct boundary conditions, in terms of set of infinite orthogonal Bessel and trigonometric functions. The orthogonality conditions are chosen on the basis of surface deformations noted during the experiments. Analysis is…
The variability of oxalate- and dithionite-extractable iron and aluminum throughout the soil profile and their relationship to total iron and clay contents were investigated for soils representative of the Chernozemic, Solonetzic, Luvisolic and Gleysolic soil orders of Saskatchewan. These distributions and relationshi…
An investigation is described into partial discharge phenomena in artificial air-filled cavities of known dimensions in polyethylene. During initial tests, the 50 percent impulse-inception stress is much higher than the discharge stress calculated from Paschen's curve. It is independent of the impulse repetition rate,…