The Structure and Properties of Materials
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Materials Literature
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Molecular hyperpolarisabilities
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Measurement of Diffusion Lengths in Direct-Gap Semiconductors by Electron-Beam Excitation
In semiconductors having high efficiency for radiative recombination, the voltage dependence of cathodoluminescence may be used to determine the diffusion length and to estimate the surface recombination velocity of excess carriers. Theoretical calculations are based on a knowledge of the Laplace transform of the dist…
Elastic moduli of the crystal lattices of polymers
Abstract Elastic moduli of the crystalline regions in high polymers have been studied. Oriented specimens were used throughout. Lattice strains were measured by an x‐ray technique in the direction of the fiber axis as well as in that perpendicular to the fiber axis. The moduli for both directions were calculated on th…
Reactions of Glasses with Aqueous Solutions
The kinetics of the reactions of various glasses with water and aqueous solutions with pH from 1 to 13 was studied. Simple binary alkali oxide‐silica glasses were examined as well as some ternary glasses derived from the binary compositions by substituting alkaline‐earth oxides for silica. All components of the glass…
5T2-1A1 Equilibriums in some iron(II)-bis(1,10-phenanthroline) complexes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT5T2-1A1 Equilibriums in some iron(II)-bis(1,10-phenanthroline) complexesEdgar Koenig and K. MadejaCite this: Inorg. Chem. 1967, 6, 1, 48–55Publication Date (Print):January 1, 1967Publication History Published online1 May 2002Published inissue 1 January 1967https://pubs.acs.o…
Mechanical properties and fine structure of drawn polymers
Abstract Complex moduli of oriented specimens of polyethylene (PE), polypropylene (PP), polyoxymethylene, polyethylene oxide), and polytetrahydrofuran were measured in sheet form as a function of direction. The dynamic tensile modulus (E′) along the stretched direction (0° direction) was found to be lower than that pe…
Benzotriazole and Related Compounds as Corrosion Inhibitors For Copper
Examination of benzotriazole-treated surfaces on copper, and the complexes produced when benzotriazole and analogous compounds react with cuprous and cupric ions in aqueous solution, has shown that the film produced on copper has a polymeric structure and is chemically bonded to the metal or metal-oxide surface Thickn…
Theory of Resonant Secondary Radiation due to Impurity Centres in Crystals
Abstract The resonant secondary radiation spectrum of impurity centres in crystals is studied on the basis of a second‐order approximation for the interaction between the electromagnetic field and the material. It is shown that for the case of excitation in the phonon wing of the absorption band, the main part of the…
Selbstdiffusion und Kernspin‐Gitter‐Relaxation von nahezu kugelförmigen Molekülen in der flüssigen Phase
Abstract Der Selbstdiffusionskoeffizient D und die longitudinale Kernspinrelaxationszeit T 1 der Protonen wurden in der flüssigen Phase zwischen Schmelzpunkt und Siedepunkt von Molekülen des Typs (CH 3 ) 4 X, mit X = C, Si, Ge, Sn, Pb, (CH 3 ) 3 CX mit X = Cl, Br, J, OH, NO 2 , (CH 3 ) 3 SiX mit X = Cl, Br, Fund (CH 3…
Conductivité Electronique et Propriétés Chimiques de Polyanilines Oligomères
Abstract Les produits obtenus à partir d'une méthode simple de préparation des éméraldines out été étudiés en ce qui concerne leurs propriétés d'acidité, d'oxydo‐réduction et de formation de complexes: ( 1 ) l'analyse des courbes de neutralisation de suspensions aqueuses d'éméraldines par des bases fortes a permis d'é…
On the Structure and Properties of Polyamides. XXVII. The Mechanism of Water Sorption in Polyamides
Abstract The sorption and the desorption isotherms of water are described for several crystalline polyamides (nylons 2, 3, 6, 7, 8, 11), amorphous polyamides (poly‐ C ‐methylcaprolactam, terpolymer of caprolactam, aminoheptanoic acid and aminoundecanoic acid) and model amides ( N ‐ethyl acetamide, Y ‐ethyl butyramide,…
On the Eu3+ Fluorescence of Mixed Metal Oxides
Abstract not Available.
High Temperature Oxidation of Metals
Abstract not Available.
Characterization of Energy Transfer Interactions between Rare Earth Ions
Energy transfer studies employing the sodium rare earth tungstates (scheelite structure) indicate a number of modes of, and requirements for, nonradiative interaction. Direct dipole‐dipole interactions are prevalent. However, dipole‐quadrupole interactions are observed for the states of the larger rare earth ions that…
Infrared Optical Properties of Vanadium Dioxide Above and Below the Transition Temperature
Received 1 November 1966DOI:https://doi.org/10.1103/PhysRevLett.17.1286©1966 American Physical Society
New Isotopes:Li11,B14, andB15
Data obtained with semiconductor detectors and a particle-identifier system on fragments ejected from uranium bombarded with 5.3-GeV protons show that $^{11}\mathrm{Li}$, $^{14}\mathrm{B}$, and $^{15}\mathrm{B}$ are particle stable, $^{10}\mathrm{Li}$ is particle unstable, and $^{13}\mathrm{Be}$ is most probably parti…
Instability of a Linear Spin Array: Application to Würster's Blue Perchlorate
A linear array of coupled spins is shown under appropriate conditions to be unstable with respect to alternation of the lattice parameter much like the Peierls instability of a one-dimensional metallic lattice. A second-order phase transition occurs, below which transition temperature the magnetic susceptibility decre…
Temperature Dependence of the Absorption Spectrum of Nickel(II)-Doped KMgCl3 and the Crystal Structure of KMgCl3
Temperature dependence from 80° to 763°K is reported for the intraconfigurational 3d8↔3d8 transitions of octahedrally coordinated [NiCl6]4− in single crystals of K(Mg1−x, Nix)Cl3 with small x. The crystal structure of the host material, KMgCl3, is reported at 298°, 383°, and 448°K. Band energies are treated in terms o…
Etude de la cristallisation des polymères I. Structure lamellaire de polyoxyéthylènes de faible masse moléculaire
Abstract Seven low molecular weight polyethyleneoxide samples have been studied by means of low‐angle X‐ray diffraction technique and dilatometry. The thickness of the crystalline lamellae of the polymer has been found exactly to correspond to the known length of the full extended polymer chains, the gap between the l…