On the Eu3+ Fluorescence of Mixed Metal Oxides
Abstract not Available.
Materials Literature
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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…
Thermodynamic Properties of Rubidium—Graphite Lamellar Compounds
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…
Survey of Negative-Ion—Molecule Reactions in O2, CO2, H2O, CO, and Mixtures of These Gases at High Pressures
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,…
Raman Scattering by Local Modes in Germanium-Rich Silicon-Germanium Alloys
Received 31 October 1966DOI:https://doi.org/10.1103/PhysRevLett.17.1209©1966 American Physical Society
Attenuation and Rotation of Plane-Polarized Ultrasound in Copper in a Longitudinal Magnetic Field
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…
Optical Properties of Free Electrons in ZnO
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…
Calculations of Small Vacancy and Interstitial Clusters for an fcc Lattice
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 fromn-Type Degenerate Silicon into Silicon Dioxide
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…
Kopplungsprinzipien organischer Farbstoffe
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…
Optical Absorption of TetrahedralFe2+(3d6) in Cubic ZnS, CdTe, and MgAl2O4
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…
The high-temperature steady-state creep of pure silver and internally oxidized silver-magnesium alloys.
High temperature steady state creep rate analysis of pure Ag and internally ionized Ag-Mg alloys
Twins and stacking faults on {310} planes in body-centred cubic metals
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…
An Experimental Investigation of Fiber Orientation and Some Properties of Needled Felts
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.