Materials Literature
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Abstract The effect of uniaxial tensile stress at constant load in the range of 0 to 6.86 MN/m 2 upon the behavior of stabilized and unstabilized types of isotactic polypropylene was investigated in the course of thermo‐oxidative aging at 80° to 130°C and of photo‐oxidative aging in the Xenotest 450 apparatus at 45° a…
Electron microscope observations are presented to show that voids can be produced in molybdenum neutron-irradiated at low temperature (60°c) by post-irradiation annealing up to 900°c. These results contrast with previous extensive work on molybdenum subjected to similar combinations of irradiation and annealing condit…
The 1200°C isothermal section of the system CaO‐BaO‐WO 3 was studied in detail. The system contains one ternary compound, Ba 2 CaWO 6 , which can exist in binary equilibrium with BaO, CaO, Ba 3 WO 6 , Ba 2 WO 5 , BaWO 4 , and Ca 3 WO 6 . The composition range of solid solutions based on the ternary compound extends fr…
A new vacancies containing allotropic form of cobalt and magnesium orthophosphates has been prepared by solid-state exchange reaction, according to the model: 2CoLiPO 4 + Li 2 SO 4 → [Co 3 □](PO 4 ) 2 + CoSO 4 2MgLiPO 4 + Li 2 SO 4 → [Mg 3 □](PO 4 ) 2 + MgSO 4 . The structure of the new form was investigated and is sh…
Ammoniumparatungstate tetrahydrate (NH 4 ) 10 [H 2 W 12 O 42 ] · 4H 2 O crystallizes in space group P 2 1 / n , a = 15.08, b = 14.45, c = 11.00 Å, β = 109.40°, Z = 2. The W atoms were located by a Patterson map, the lighter atoms (21 O, 5NH 4 + , 2H 2 O per asymmetric unit) by a ΔF map. Using anisotropic temperature f…
Boron carbide is the prime candidate material for neutron absorbers in fast breeder reactors and the Fast Test Reactor. Important data required for design of control rods for these reactors concern swelling, gas release, and structural integrity of boron carbide under the expected operating conditions. Data for irradi…
Recently, treeing breakdown has been identified as an important factor controlling the long time breakdown of polymer insulation systems. However, due to its complicated nature, the mechanisms involved are not yet fully understood. Using experimental results from other investigators, together with our own, this paper…
The symmetry properties of potassium iodate have been investigated in order to determine whether it might be a useful nonlinear optical material. In order to resolve the confusion over the point symmetry of this material, several experimental techniques have been used. These are single-crystal X-ray diffraction (room…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTJOINT COMMITTEE ON POWDER DIFFRACTION STANDARDSCite this: Anal. Chem. 1972, 44, 12, 75APublication Date (Print):October 1, 1972Publication History Published online23 May 2012Published inissue 1 October 1972https://doi.org/10.1021/ac60320a761RIGHTS & PERMISSIONSArticle Views1…
The degree of preferred orientation (texture) of doctor‐bladed polycrystalline 99.5% Al 2 O 3 substrates from 3 sources was evaluated by qualitative optical and quantitative X‐ray analyses. The substrates exhibit a fiber texture in which the basal planes lie preferentially in the plane of the substrate. The same textu…
The exceptionally strong Kerr effect of some nematogenic compounds with strong electric dipole moments parallel to their long molecular axes was investigated. The Kerr constants just above the clearing point T cl were about 100 times larger than with nitrobenzene. The temperature dependence of the Kerr effect obeyed (…
Electrical conduction in amorphous As 2 Se 3 is investigated at frequencies from 30 Hz to 10.3 GHz in the temperature range -180° to 500°C. The observed conductivity σ can be expressed as a sum of dc conductivity σ dc and ac conductivity σ ac , namely σ=σ dc +σ ac . The quantity σ dc depends exponentially on reciproca…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of Silver-Catalyzed Ethylene OxidationP. L. Metcalf and P. HarriottCite this: Ind. Eng. Chem. Process Des. Dev. 1972, 11, 4, 478–484Publication Date (Print):October 1, 1972Publication History Published online1 May 2002Published inissue 1 October 1972https://pubs.acs…
Data are presented for the ${\mathrm{Te}}^{125}$ Knight shift (${\mathcal{K}}^{125}$) and spin-lattice relaxation rate ($\frac{1}{{T}_{1}}$) over the temperature ranges 675-1250 K and 680-900 K, respectively, in liquid tellurium. The temperature dependence of ${\mathcal{K}}^{125}$ is compared with that of the total ma…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
The characteristics of terbium-activated gadolinium oxysulfide and lanthanum oxysulfide are compared with those of calcium tungstate. The new rare-earth phosphors have higher x-ray absorption in the 38 to 70 keV region relative to calcium tungstate. They also exhibit a larger x-ray-to-visible light energy conversion e…
Abstract Oxidation of octahedral ferrous iron in biotite by saturated bromine water results in a loss of both octahedral and interlayer cations. The hydroxyl adjacent to vacant octahedral cation sites adopt an inclined orientation resulting in a more stable environment for interlayer cations. The only structural chang…
The electronic coupling in the $4{f}^{6}5d$ configuration of ${\mathrm{Eu}}^{2+}$ in crystals has been studied. The complete $f\ensuremath{-}d$ Coulomb matrix within ${f}^{6}(^{7}F_{J})^{2}e_{g}$ has been obtained and the Hamiltonian diagonalized for various values of the spin-orbit and Coulomb parameters. The magneto…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of trinitratobis(bipyridyl)lanthanum(III)A. R. Al-Karaghouli and J. S. WoodCite this: Inorg. Chem. 1972, 11, 10, 2293–2299Publication Date (Print):October 1, 1972Publication History Published online1 May 2002Published inissue 1 October 1972htt…
Abstract Conditions have been found for the etching of poly(ethylene terephthalate) with water so that the crystalline portions alone remain. Initial sample and hydrolysis products are analyzed by extraction of low molecular weight products; density, viscosity molecular weight, and endgroup determination; heating‐rate…