Materials Literature
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Phase equilibria in the system BaO‐SrO‐SiO 2 in air were established using conventional solid‐state techniques. The phase relations in the boundary system SrO‐SiO 2 were completed by determining the liquidus temperatures for the SrO‐rich portion of the diagram. The known compounds, SrSiO 3 , Sr 2 SiO 4 , and Sr 3 SiO…
Zirconium carbide specimens containing significant quantities of dissolved oxygen were synthesized using ZrO 2 and graphite as reactants in an atmosphere of CO. These specimens were studied by X‐ray diffraction and analyzed chemically for C, O, and Zr. The data indicate that oxygen substitutes in the ZrC lattice, repl…
High-purity monocrystalline aluminum disks of three crystallographic orientations were subjected to carefully controlled planar impact producing low levels of spall damage. This damage was observed by optical and scanning electron microscopy of sections through the recovered disks, and was found to consist of voids of…
Transmission electron microscopy of tungsten irradiated at about 550°C to a fast neutron fluence of approximately 1×1022 neutrons cm−2 reveal the formation of a superlattice of voids. The void lattice parameter is 195 Å and the lattice parameter to average void size is about six. Both the formation of the superlattice…
Three natural cubes, each of edge length about 1·8 mm. were examined by x-ray topography. Two possessed very similar internal structures, describable in terms of space-filling by fibrous or columnar single-crystal growth in <111> directions, with branching and equal growth velocities in these symmetrically equivalent…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTetragonal cobalt(III) complexes containing tetradentate macrocyclic amine ligands with different degrees of unsaturationSusan C. Jackels, Keith. Farmery, E. Kent. Barefield, Norman J. Rose, and Daryle H. BuschCite this: Inorg. Chem. 1972, 11, 12, 2893–2901Publication Date (…
The collapse of spark-induced cavitation bubbles in a flowing system was studied by means of high speed photography. The migration of cavitation bubbles toward a nearby solid boundary during collapse and rebound was observed. Near its minimum volume the bubble typically formed a high speed microjet, which struck the n…
Abstract The thermal conductivities of polystyrene and polyethylene containing several different particulate solids were measured over a range of solid concentrations. Experimental data were compared with results predicted by theoretical models for two‐phase media. The equations of Bruggeman and Cheng‐Vachon both gave…
Abstract A simple method is described for the quantitative analysis of urinary δ-aminolevulinic acid. 2-Methyl3-carbethoxy-4-(3-propionic acid) pyrrole, produced by the condensation of δ-aminolevulinic acid with ethyl acetoacetate, is almost completely extracted from an aqueous solution with ethyl acetate without reso…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalysis in molten salt mediaGeorge W. ParshallCite this: J. Am. Chem. Soc. 1972, 94, 25, 8716–8719Publication Date (Print):December 1, 1972Publication History Published online1 May 2002Published inissue 1 December 1972https://pubs.acs.org/doi/10.1021/ja00780a013https://doi…
Abstract The spherulite growth rate, the maximum spherulite radius, and the overall rate of crystallization of poly(ethylene terephthalate) (PETP) were measured by means of scattering and transmission of depolarized light. The influence of crystallization temperature, molecular weight, and additives on the above‐menti…
We determined the variation of the Curie temperature with pressure for iron, cobalt, nickel, six iron-nickel alloys, and five cobalt-nickel alloys. A permeability method in zero magnetic field has been used in a belt-type apparatus at pressures up to 90 kbar and temperatures up to 1400 \ifmmode^\circ\else\textdegree\f…
The experimental 14N and 17O n.m.r, results in a series of lanthanide complexes are successfully interpreted from a second-order perturbation treatment of the calculation of (S2), where bonding effects and spin-orbit coupling mixing are incorporated. The isotropic hyperfine interaction constants are shown to be negati…
The problem of a nematic liquid crystal in an electric field is solved. Effects due to conductivity of the liquid have been neglected. Numerical solutions are given for various values of parameters. The solution is compared with experimental data taken from the literature. A computer program has been developed to do a…
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