Materials Literature
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Existing formulations for systems with complete translational invariance relate the dielectric function to the scattering probability in characteristic-energy-loss experiments. We have extended this relationship to the case of periodic systems. Energy-loss vs momentum-transfer measurements are of value because they pr…
We describe a method of accurately measuring the secondary electron yield of solids over the entire incident energy range of 0–1000 eV in less than 30 msec using a commercial LEED/Auger system. Particular attention is paid to the region of low-energy incident electrons (Ep=0 to 100 eV), and the spatial and energy reso…
Abstract Silicones (polydimethyl siloxanes) greatly increase the oxidative stability of an edible oil at high temperature. The effect is demonstrated here, using a thin layer chromatography technique to follow the oxidation of the oil. The minimum fully effective concentration corresponds to a monolayer of silicone on…
Abstract The effect of previously proposed distributions of particle size and interparticle “gap” lengths on the small‐angle x‐ray scattering of a paracrystalline one‐dimensional macrolattice has been examined. It was concluded that the general paracrystalline model, in which the fluctuations of crystalline and amorph…
The optical properties and practical realization of ion and electron lenses are reviewed. Attention has chiefly been directed to electrostatic and magnetic electron lenses of rotational or planar symmetry, especially to those which seem to offer advantages in scientific instruments. Various competing methods of calcul…
A model of the β to ω phase transformation in Ti, Zr and Hf alloys is proposed whereby the three-dimensional displacive transition is decomposed into one-dimensional and two-dimensional components. The one-dimensional component is postulated to be a linear displacive defect along 〈111〉 closepacked rows of the b.c.c. s…
It is obvious that the title of this article encompasses an area too vast to be adequately covered in a single review paper. Thus, we hasten to remark at the outset that the primary topic to be dealt with here is the relation between the crystal dynamics, on the one hand, and the basic interactions between the valence…
The stress-strain behavior of glass bead-filled polystyrene, styrene–acrylonitrile, styrene–acrylonitrile–butadiene, and polyphenylene oxide composites is studied at various temperatures below their glass transition temperature. Earlier studies of bead-filled composites indicated that the addition of filler decreases…
The anisotropic liquid-structure factor of $p$ -cyanobenzylidene-amino-$p$-$n$-octyloxybenzene has been measured in the nematic phase using $\mathrm{Cu} K\ensuremath{\alpha}$ x rays. This material exhibits a second-order phase transition to the smectic $A$ phase at ${T}_{c}=82.8$ \ifmmode^\circ\else\textdegree\fi{}C.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure of stannic phthalocyanine, an eight-coordinated tin complexW. E. Bennett, D. E. Broberg, and N. C. BaenzigerCite this: Inorg. Chem. 1973, 12, 4, 930–936Publication Date (Print):April 1, 1973Publication History Published online1 May 2002Published inissue 1 A…
A new concept of the nature of the α1-relaxation mechanism of high-density polyethylene is proposed. This concept is based on the mechanical properties observed in the α-temperature range for as-grown single crystal mats and for samples of bulk crystallized material. The decomposition of the α-multiple-relaxation proc…
Abstract Pulse pile‐up, dead time, escape peaks, background, and peak overlap in Si(Li) spectra are discussed in relation to microprobe analysis, and procedures for carrying out the necessary corrections for quantitative analysis of elements of atomic number 11 to 30 are described. The accuracy is generally comparable…
Sputter deposition of Mo atoms on W substrates (and vice versa) was shown to form uniform overlayers. Such overlayers are ideally suited for studies of the escape length of Auger electrons. The results show that the escape length increases with Auger electron energy as expected. In both Mo and W the escape length of 4…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTActivation of homogeneous catalysts by polymer attachmentRobert H. Grubbs, Carl. Gibbons, LeRoy C. Kroll, Wesley D. Bonds, and C. H. BrubakerCite this: J. Am. Chem. Soc. 1973, 95, 7, 2373–2375Publication Date (Print):April 1, 1973Publication History Published online1 May 200…
Abstract Systematic discrepancies between the experimentally observed phonon dispersion law and that predicted by the theory of the lattice with polarizable ions in the short wavelength region are discussed. The discrepancies appear to be due to the quadrupole deformation of ions, primarily of anions. The adiabatic la…
Summary Wool samples from 47 Barki yearlings were taken from five positions during two years to study the variability in the fleece, the cause of variability and associations between different fleece traits. Statistical analysis has indicated the following significant points. An antero-posterior gradient occurred in t…
Triallyl cyanurate (TAC) and triallyl isocyanurate (TAIC) are thermosetting monomers with interesting interrelations: Calorimetry and infrared spectrophotometry were used to investigate the influence of atmosphere and initiator on the thermal events. The large extents of reaction observed during polymerization of TAC…
Partially oxidized tin(II) niobate and tantalate pyrochlores are homogeneous cubic phases. They have been shown by Mössbauer 119 Sn spectroscopy to contain both Sn(II) and Sn(IV). Each valency state is segregated on its own, crystallographically distinct sublattice as a consequence of the size disparity of Sn 2+ and S…
Abstract Abnormal scatterings of X-rays take place between Bragg spots. Their study in hydrated Mg- and Ni-vermiculites shows that they appear in reciprocal space in the form of modulated lines, elongated along the Z * axis. These scatterings demonstrate a two-dimensional organization of the compensating cations and o…
Abstract Urethane elastomers with a wide range of properties were prepared by reaction of toluene diisocyanate, diphenylmethane diisocyanate or an aliphatic diisocyanate with a series of castor oil derivatives. The castor derivatives included amides prepared by reaction of castor oil with mono‐ or dialkanolamines, ami…