Materials Literature
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The theory of vibrational hyper-Raman scattering (inelastic second harmonic light scattering) is developed within the framework of quantum electrodynamics. The dynamical system comprises the molecule and the radiation field, coupled by multipolar interactions. In the present work, the electric dipole approximation is…
The tables of $l$-dependent ion-core radii ($l=0,1,2$) derived from free-ion quantum defects and previously presented by Simons and Bloch are extended to include halogens and the group-$\mathrm{I}\ensuremath{-}B$ metals (Cu, Ag, and Au). From these radii hybridized bond-orbital coordinates with $\ensuremath{\sigma}$ a…
In this study of metallic perovskites Mn 3 MX (M=metal, X=C, N) we emphasize the influence of the (outer) electron concentration on the sequences of crystallographic transitions, on the magnetic ordering temperatures and on the constant (Pauli-type like) part of the magnetic susceptibility. A great variety of observed…
The susceptibility of oxygen adsorbed on graphite indicates that magnetic transitions are present even in films of submonolayer thickness. This result contrasts with previous work on amorphous oxygen films and strongly supports the supposition that antiferromagnetic order can only be present simultaneously with config…
Rutherford back-scattering and X-ray photoelectron spectroscopy (XPS) have been used to study the stoichiometry and chemical composition of RF-sputtered thin films of ZnS. The results show that stoichiometry of the starting material is no guarantee of stoichiometry in the final film. Films grown in the normal way have…
Abstract IR. and Raman spectra of LnONO 3 (50–4,000 cm −1 , LnLa, Gd, Eu, and Dy) are reported and discussed. The low frequency region of the spectra reflects the cubic structure of these compounds. The dimensions of the cubic unit cells determined by X‐Ray powder diagrams are: 12.81 ± 0.05 Å for EuONO 3 , 12.69 ± 0.…
Abstract Poly‐ϵ‐caprolactam (Nylon‐6) wurde direkt in der Ionenquelle eines Massenspektrometers pyrolysiert. Bereits bei Temperaturen unterhalb 100°C heginnen dabei die im Polymeren enthaltenen cyclischen Oligomeren im Hochvakuum zu verdampfen und können massenspektrometrisch ohne vorherige Isolierung identifiziert we…
It is well known that sulfide stress corrosion (SSCC) and hydrogen induced cracking (HIC) or blistering could take place in the steel in wet hydrogen sulfide environment. It is said that SSCC could occur in relatively high strength steel having the hardness 20 to 22 in Rockwell C scale. [HR C > 20~ 22]1) Accordingly,…
Copper and its alloys have long been utilized in marine environments for a variety of reasons. One important property is resistance to fouling by marine organisms. Copper and many of its alloys have the ability to suppress attachment of marine animals, possibly due to the toxic effects of the corrosion products or cop…
Nondispersive hopping transport has been observed in disordered poly($N$-vinylcarbazole) (PVK) but not in the related polymer 3 Br-PVK. The results demonstrate that a hopping-time distribution $\ensuremath{\psi}(t)\ensuremath{\sim}{t}^{\ensuremath{-}(1+\ensuremath{\alpha})}$ can account for the transit-time dispersion…
Linear polyethylene Standard Reference Materials SRM 1482, 1483, and 1484 are certified for limiting viscosity number in 1,2,4-trichlorobenzene and 1-chloronaphthalene at 130 °C. In this paper the experimental procedures employed for the determination of limiting viscosity numbers for these materials by capillary visc…
Sampling circuitry on the lines of that in a sampling oscilloscope has been interfaced with a scanning electron microscope (SEM). This sampling SEM allows the examination of very fast, repetitive voltage waveforms with rise times of the order of 200 ps or less.
The results are given for the calculation of the profile function of the scattering curve and the calculated primary extinction factor for a crystal in the form of a square-section parallelepiped as a function of its size τ, expressed in extinction length units. The calculations are based on the equations of the dynam…
Three K silicates having SiO2/K2O ratios of 4, 5, and 6 were compared with single and split applications of KCI, (KPO3)n, and sulfur-coated KCI (SCK-34) for their availability to four cuttings of common bermudagrass. At the rate of 200 mg of K/pot, all silicates applied in fine particles gave the same pattern of yield…
The approximate anisotropy field (Han) has been determined for twelve experimental oriented barium ferrite recording tapes and magnets with coercive force (Hc) between 715 Oe and 5250 Oe, and squareness ratio greater than 0.80. The Han values were taken as the ratio of saturation magnetic moment (ms) to the initial ha…
Abstract The investigation on phase relationships and pertinent heat effects in branched alkali alkanoates was extended to lithium, sodium and potassium 2,2-dimethylpropanoates, 2-ethylbutanoates and 3,3-dimethylbutanoates. The results allow to discuss some aspects of the thermal behaviour of these salts, among which…
Research is being conducted on potentially large-scale uses of sulfur to extend or replace such construction materials as asphalt, cement, and mineral aggregates. Paving materials have been developed in which sulfur replaces up to 50% of the asphalt and which can be handled with existing mixing and paving equipment. S…
Abstract Two major vanenes of glauconite are distinguished within the Upper Cretaceous and Tertiary formations of the Castle Hill Basin. Type A is the only variety present in the Upper Cretaceous Broken River Coal Measures, is absent in the Upper Cretaceous to Eocene Iron Creek Greensand which overlies the coal measur…
A commercial process has been developed by Gulf Oil Canada to produce a novel sulfur-asphalt (SA) binder for flexible pavements by extending and replacing asphalt with up to 50 wt % elemental sulfur. The process uses a sulfur-asphalt mixer module (SAM) to finely disperse liquid sulfur into a continuous asphalt phase w…
The paper summarizes the results of neutron scattering from a weak itinerant ferromagnet MnSi (the itinerant electron system) and Invar alloys: Fe65Ni35 and Fe3Pt (the quasi-localized spin system). Well defined spin wave excitations as well as the excitations in the Stoner continuum could be detected at 5 K for MnSi i…