Materials Literature
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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…
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…
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…
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…
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,…
Abstract not Available.
Abstract not Available.
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…
Received 1 November 1966DOI:https://doi.org/10.1103/PhysRevLett.17.1286©1966 American Physical Society
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…
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 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…
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…
Phase equilibria in the rubidium—graphite system were studied by means of the Knudsen effusion method in conjunction with a tracer technique. A new compound, C10Rb, analogous to the compound C10Cs, was observed. Vapor-pressure measurements were made in the various two-phase regions in the rubidium—graphite system at t…
The negative-ion species produced in O2 and some gases containing oxygen have been surveyed for various pressure and E/p conditions using an rf mass spectrometer coupled to an electron drift tube operating at pressures up to 5 torr. The gases studied include O2, CO2, H2O, and CO as well as the mixtures CO2–O2, H2O–O2,…
Received 31 October 1966DOI:https://doi.org/10.1103/PhysRevLett.17.1209©1966 American Physical Society
The rotation of the plane of polarization and attenuation of a shear sound wave at 4.2\ifmmode^\circ\else\textdegree\fi{}K have been measured for the propagation vector q parallel to the magnetic field B in the [001] direction in copper. Frequencies from 30 to 110 Mc/sec were used. Both the attenuation and rotation ar…
The optical properties of indium-doped ZnO crystals, with free-carrier concentrations ranging from ${10}^{19}$ to 5\ifmmode\times\else\texttimes\fi{}${10}^{19}$ ${\mathrm{cm}}^{\ensuremath{-}3}$, have been studied at room temperature. The condition of the crystal surfaces has been shown to influence radically the refl…
Binding and migration energies and atomic configurations have been calculated for small vacancy and interstitial clusters in an fcc lattice with a model which should be applicable to nickel. The mathematical model consisted of a spherical crystallite containing about 530 atoms which were treated as individual particle…
Photoemission of electrons from both the conduction and valence bands of $n$-type strongly degenerate silicon (${10}^{26}$ electrons/${\mathrm{m}}^{3}$) into thermally grown silicon dioxide layers has been observed. The threshold energies have been determined for the two processes and are used to obtain the following…