Materials Literature
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The elastostatic problem for an infinite orthotropic strip containing a crack is considered. It is assumed that the orthogonal axes of material orthotropy may have an arbitrary angular orientation with respect to the orthogonal axes of geometric symmetry of the uncracked strip. The crack is located along an axis of or…
Abstract Dynamic mechanical measurements on ultrahigh modulus polyoxymethylene have been undertaken over the temperature range −150 to 20°C. Measurements of the longitudinal crystal modulus have also been made by studying changes in the (009) reflection with load, over a similar range of temperatures. The dynamic Youn…
The diffusion coefficient of aluminium atoms in migrating grain boundaries in Ni-Al alloys is observed to be three orders of magnitude higher than the corresponding values in stationary boundaries of the same material. This result may be understood if it is assumed that the diffusion in migrating boundaries occurs by…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural and magnetic properties of dimeric di-.mu.-chloro-tetrakis(ethylenediamine)dinickel(II) chlorideK. O. Joung, C. J. O'Connor, E. Sinn, and R. L. CarlinCite this: Inorg. Chem. 1979, 18, 3, 804–808Publication Date (Print):March 1, 1979Publication History Published on…
Abstract Na 3 Cu 4 S 4 can be prepared by fusion reaction of copper with Na 2 CO 3 and sulfur at 600 °C. The structure (orthorhombic, Pbam, a= 14,624(6), 6 = 7,163(3), c = 3,771(1)Å; Z = 2) solved from x-ray diffractometer data (R = 0,024; 391 obs. reflections) shows unlinked copper-sulfur chains of the kind already o…
The hot-deformation behaviour of a cold-rolled Zr-bearing Al-Mn alloy and a commercial superplastic Al-Cu-Zr alloy has been investigated. During hot-deformation the subgrain size increased while the density of Al3Zr particles decreased with increasing strain. The decrease in particle density was caused by a discontinu…
Electrochemically controlled test methods have been used to determine the influence of thermal treatment on the stress corrosion cracking (SCC) resistance of Inconel alloy 600 (I-600) in deaerated 10% NaOH solutions at 315 C (600 F). Maximum susceptibility to SCC was observed when the electrode potential of the I-600…
Abstract Polytungstates are obtained by the reaction of hydrated tungsten (VI) oxide with bases or salts after occasional addition of organic solvents. With liquid ammonia the as yet unknown ditungstate, (NH 4 ) 2 W 2 O 7 , is produced. Its IR spectrum has few absorption bands suggesting a very simple constitution. Pi…
Abstract The theory developed in Part I of this series is modified to accommodate polymers that possess closely spaced, bulky side groups on the chains. The side groups give rise to free space between the chain “cores,” which reduces the chain separation required for penetrant motion transverse to the local chain axis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTColloid Titration Behavior of Poly(ethyleneimine)Etsuo KokufutaCite this: Macromolecules 1979, 12, 2, 350–351Publication Date (Print):March 1, 1979Publication History Published online1 May 2002Published inissue 1 March 1979https://doi.org/10.1021/ma60068a043RIGHTS & PERMISSI…
Abstract The heat capacities of water swollen poly[2‐(2‐hydroxyethoxy)ethyl methacrylate] were determined in a DSC‐2 calorimeter within the temperature range 220–350K for concentrations from 0 to 1,2g of water per 1g of the polymer. At temperatures above 0°C the partial specific heat capacity of water in gel is concen…
We have used elastic neutron scattering to examine the effect of hydriding on the sublattice magnetization of the Laves-phase compounds RFe2 for R=Ho and Er. On addition of hydrogen or deuterium a stable phase of composition about RFe2D3.5 is formed. The pure compounds RFe2 are ferrimagnetic, with the R moment equal t…
The complexes Ph3ERe(CO)3( ,10-phenanthroline) (E = Sn, Ge) exhibit optical emission (approx. 750 nm) from the lowest excited state in CH2Cl2/CCl4 solutions at 298deg. K and also give E-Re bond cleavage (Phi approx. 0.25) upon photoexcitation under the same conditions. Both the relative emission quantum yield and the…
The magnetic moment and susceptibility of the linear-chain antiferromagnets CsNiCl3 and RbNiCl3 have been studied up to fields of 60 kG from 1.1 K to beyond their respective Néel temperatures. In both compounds clear evidence for a spin-flop transition near 20 kG has been obtained with the applied field parallel to th…
Single crystals of NaCl, KCl and RbCl doped with divalent europium up to 600 p.p.m. were grown by the Czochralski technique. Taking advantage that the Eu 2+ ion produces two optical absorption bands in these crystals, calibration constants for determining the Eu 2+ concentration in the alkali chlorides by optical tech…
The interaction of oxygen with a Ni 76%/Fe 24% (100) surface has been studied at 293 K. XPS measurements were made as a function of emission angle to obtain depth distributions. Slight Fe segregation is observed for a clean annealed surface. It is enhanced by oxygen adsorption. By 0.7 monolayers oxidized Fe species ar…
We have investigated the potential of SIMS for providing information on substrate–adsorbate geometry and substrate–adsorbate elemental and chemical composition by studying adsorption on Ni (100) while simultaneously monitoring by XPS and LEED. H2, CO, O2, and H2O were studied. We find no obvious dependence in SIMS ion…
The crystallographic features of several directionally solidified binary oxide eutectics were examined by the Buerger precession X‐ray method and are discussed in terms of the lattice misfit and ionic charge compensation at the interface, particularly with regard to the oxygen sublattice. Fibrous and lamellar micro‐st…
An analysis of the measurement of grain-boundary diffusion at low temperatures by the surface-accumulation mehod was carried out. In this method atoms are allowed to diffuse along grain boundaries from a source to a free surface where they spread out, accumulate, and are measured. The diffusion is carried out at low t…
The structure of cytochrome b562 from Escherichia coli has been determined at 2.5 A resolution by x-ray diffraction methods. Protein phases were computed by the single isomorphous replacement method with anomalous scattering measurements from the native and uranyl acetate-substituted crystals. The electron density was…