Materials Literature
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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…
Abstract In Farbstoffmolekülen, die zwei und mehr Polymethin‐Strukturelemente, oder wenigstens ein Polymethin‐ und ein Polyen‐Strukturelement enthalten, treten in der Regel Kopplungseffekte auf, die das spektroskopische Verhalten und andere physikalisch‐chemische Eigenschaften bestimmen. Mit Hilfe der Kopplungskonzept…
The optical absorption spectrum of substitutional ${\mathrm{Fe}}^{2+}$ ions at concentrations from 2\ifmmode\times\else\texttimes\fi{}${10}^{18}$ to 4\ifmmode\times\else\texttimes\fi{}${10}^{20}$ ${\mathrm{cm}}^{\ensuremath{-}3}$ has been studied for cubic ZnS, CdTe, and Mg${\mathrm{Al}}_{2}$${\mathrm{O}}_{4}$ single…
High temperature steady state creep rate analysis of pure Ag and internally ionized Ag-Mg alloys
The stacking properties of {310} planes in body-centred cubic metals and their relation to twinning behaviour are investigated. It is shown that the twinning translation can be produced by a partial dislocation with Burgers vector of the form (α/10)〈513〉. Such partials can be formed by the dissociation onto a {310} pl…
The fiber orientation and fiber breakage were studied in a felt, needled in a laboratory needling machine, and the relationship between degree of needle penetration and felt thickness, density, strength, and air permeability was determined.
Abstract The gelation of vinyl plastisols at constant temperature has been found to follow the equation ln [( C − C e )/( U − C e )] = (− π 2 / a 2 ) D τ + ln (8/π 2 ), where C is the resin phase concentration, C e the equilibrium resin phase concentration, U the critical resin phase concentration, a the average parti…
The bidirectional spectral reflectance of a set of V-grooved surfaces has been investigated in an attempt to separate the influences of the mean slope and the peak-to-valley height. The experimental results show good agreement with the theoretical models in both the geometrical optics and diffraction ranges.
A number of binary systems comprising a liquid crystalline Schiff's base, viz. p-acetoxybenzal-p-phenetidine and a non-liquid crystalline Schiff's base are studied. In all these cases, the liquid phase, be it anisotropic or not, is a single homogeneous phase. There is no indication of two distinct liquid phases, one a…
Dislocation measurements obtained after creep of Fe-3·0% Si by Barrett et al. (1966) have been analysed. It is shown that mean mobile dislocation velocity is linearly related to mobile dislocation density in support of a previous model of creep (Webster 1966). Furthermore, the creep curves calculated using these resul…
Abstract Stress relaxation experiments were carried out in a dry nitrogen atmosphere on polydimethylsiloxane and an ethylene‐propylene terpolymer. Relaxation times much longer than expected were observed, and plots of In f ( t )/ f (0) versus time were linear in all cases.