Materials Literature
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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…
Gas phase hydrogen permeation studies were conducted on hollow, cylindrical membranes of triply zone-refined alpha iron, AISI 304 austenitic stainless steel, and AISI-SAE 4130 steel in both the normalized (ferrite and carbide) and quenched and tempered (martensite) conditions. Membrane temperature was varied from less…
The results of an electrochemical investigation of the corrosion behavior of reactor structural materials determined both in and out of reactor are presented. Electrochemical kinetic measurements in and out of reactor were fairly difficult to obtain because of the high purity (and associated poor conductivity) of the…
Electromigration in 525 AA Au films has been studied by transmission electron microscopy during the actual passage of current. The effects of electromigration were the growth of voids near the cathode end and the growth of hillocks near the anode end of the test strip. The hillocks were rounded in shape with heights u…
Blends were prepared with high-modulus “filler polymers,” polystyrene, polyamide, and poly(methyl methacrylate) dispersed in a low modulus matrix of ethylene/vinyl acetate copolymer. The modified Kerner equation was applied to dynamic mechanical data obtained on these blends, which may be considered to be model system…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic structure of silane hydride anion (SiH5-) and model studies of inter- and intramolecular exchange in pentacoordinate silicon species. Ab initio investigationDouglas L. Wilhite and Leonard. SpialterCite this: J. Am. Chem. Soc. 1973, 95, 7, 2100–2104Publication Date…