Materials Literature
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Chemical utilization of the sun's radiation is very attractive aim. The evolution of oxygen and, on irradiation, hydrogen from water in the presence of redox catalysts are known, but rather slow processes. Colloidal ruthenium and other metals catalyze these reactions better than less finely divided materials.
The writers report on the dynamics of the standard penetration test (SPT) as determined from a study involving hammer impact and wave mechanics theory, field measurements of dynamic behavior during SPT, and computer simulations using the wave equation as developed for computer studies of pile driving. The field data m…
X-ray diffraction and differential scanning calorimetry studies show that the linear polyester poly (tetramethylene adipate) (PTMA) can exist in two polymorphic forms in the solid state, which are designated α- and β-PTMA. The α form is obtained by annealing a stretched film at 52°C for several days. The unit cell is…
The diffusivity of freshly formed thoron decay products was studied under a variety of conditions with respect to relative humidity and electric charge and over a range of thoron concentrations from 340 nCi/l to 3.4 × I05 nCi/l. 85–88% of ThB(212Pb) atoms carried a positive charge when formed. In moist air (30% < rela…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic structure of Ru2(O2CR)4+ and Rh2(O2CR)4+ complexesJoe G. Norman Jr., George E. Renzoni, and David A. CaseCite this: J. Am. Chem. Soc. 1979, 101, 18, 5256–5267Publication Date (Print):August 1, 1979Publication History Published online1 May 2002Published inissue 1 A…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBinuclear complexes of macrocyclic ligands. Electrochemical and spectral properties of homobinuclear CuIICuII, CuIICuI, and CuICuI species including an estimated intramolecular electron transfer rateRobert R. Gagne, Carl A. Koval, Thomas J. Smith, and Marc C. CimolinoCite th…
Force per unit area measurements made in the megabar pressure cell, independently of other pressure calibration systems, are consistent with the ruby R1 scale of Mao, Bell, Shaner, and Steinberg and its extrapolation to 1.4 Mbar. Physical analysis of diamond anvils removed after experiments to maximum pressures of 1.3…
Optical and electron metallography have been used to examine the substructures developed in OFHC copper after rolling reductions from 50–97%. These structures are related to the displacements observed at free surfaces after deformation. It is shown that deformation occurs in a series of overlapping stages in each of w…
Accurate lattice parameters and thermal expansion coefficients of the low- and high-temperature phases of VO2 have been determined from measurements on single crystals with the Bond method [Acta Cryst. (1960), 13, 814–818]. The transition from a semi-conducting to a metallic phase occurs over a temperature range of 0.…
A redetermination of crystal data for InSe (hexagonal), α-In2Se3 (rhombohedral), α-In2Se3 (hexagonal), β-In2Se3 (rhombohedral), γ-In2Se3 (hexagonal), and δ-In2Se3 (hexagonal) has been undertaken because of discrepancies among the published results in the literature and in the JCPDS Powder Diffraction File.
Adiabatic plastic may play a role in such widely diverse areas as ballistic impact, explosive fragmentation, cryogenic behavior of materials, high velocity shaping and forming, machining, grinding 0), surface frictional effects, erosion (2), and seismic faulting. All of the shearing phenomena are based on two facts: A…
The free-volume model, which has been useful for describing the behavior of the viscosity $\ensuremath{\eta}$ of dense liquids and glasses, is extended to account for their thermodynamic behavior as well. Experimental results for the heat capacity ${C}_{p}$ and the volume $\overline{v}$ show that the system falls out…
An investigation is made of the relationship between the coefficients of the electrooptic effects and the tensors of the nonlinear electric susceptibilities. The form of the tensor K, which describes the fourth-order nonlinear electrooptic effect, is found for crystals having 42m symmetry. The results are given of pol…
The $\mathrm{Cu}(100)c(2\ifmmode\times\else\texttimes\fi{}2)$-CO and $\mathrm{Ni}(100)c(2\ifmmode\times\else\texttimes\fi{}2)$-CO structures have been examined by dynamical low-energy electron diffraction intensity analysis using the (00), (\textonehalf{}\textonehalf{}) and (10) beams measured at 80 K (Cu) and 120 K (…
It is shown that thin layers of Pd or Pt enhance the uptake rate of hydrogen into bulk Nb with almost every hydrogen atom that hits the surface passing into the bulk. A model for the kinetics is formulated showing that in a composite-system large uptake rates are achieved by combining the surface properties of Pd with…
E.S.R. study of radiation damage in a single crystal of sodium dimethyl arsonate L'irradiation aux rayons X, à 77 K, d'un monocristal de diméthylarsinate de sodium provoque le piégeage de \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm CH}_{\rm 3} \left({\rm O} \right){\rm As}\left({{\rm O}^ -} \right)\…
The elastic parameters of dislocations in rutile crystals in the temperature range from 100 to 298 K are determined by numerical calculations in terms of an anisotropic elasticity theory. The results are applied to possible dislocation reactions and elastic stress fields of dislocations. The energy factor of edge disl…
Experimental observations of jogs on dissociated dislocations are discussed. It is shown that using the weak-beam technique of electron microscopy both extended and apparently contracted jogs can exist on the same dislocation: the extension of jogs depends on several factors including the height of the jog and the cha…
The measured charge transport characteristics of vitreous 0.55 As2S3: 0.45 Sb2S3 are analysed on the basis of a theory developed for the anomalous carrier drift, controlled by capture in traps distributed in energy. For the case of an exponential trap distribution the dependence of the activation energy εa on the fiel…
The temperature dependence of the dielectric constant of Cs${\mathrm{H}}_{2}$P${\mathrm{O}}_{4}$ shows a crossover between a region ($3 \mathrm{K}<~T\ensuremath{-}{T}_{c}<~90 \mathrm{K}$) dominated by one-dimensional correlations and a region ($0 \mathrm{K}<~T\ensuremath{-}{T}_{c}<~3 \mathrm{K}$) dominated…