Materials Literature
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A large differnce in widths and intensities between Stokes and anti-Stokes spin-flip Raman scattering lines of donor electrons in $n$-CdS has been observed. This asymmetry arises from the linear $k$ term, $\ensuremath{\lambda}(\stackrel{\ensuremath{\rightarrow}}{\mathrm{k}}\ifmmode\times\else\texttimes\fi{}\stackrel{\…
In a companion paper we have reported on high-temperature creep data from 41 selectively oriented single crystals of olivine. We report here on a study of the dislocation structures in these specimens by a decoration technique. Forty-two additional specimens were deformed to explore the dislocation multiplication proc…
A total of 41 selectively oriented single crystals of olivine (Fo92) were deformed under uniaxial stresses of 100–1800 bars in the temperature range 1150°–1600°C. Under uniform stress no strain inhomogeneities were observed. For all orientations both strain rate and dislocation structure stabilized after 1–2% strain a…
This paper reports elastic and inelastic neutron-scattering studies on the incommensurate linear-chain mercury compound ${\mathrm{Hg}}_{3\ensuremath{-}\ensuremath{\delta}}\mathrm{As}{\mathrm{F}}_{6}$. The one-dimensional phonon dispersion curve associated with the randomly phased linear Hg chains has been measured at…
We report an investigation of the direct forbidden absorption edge of Ti${\mathrm{O}}_{2}$. For the first time we have resolved the weak quadrupolar $1s$ exciton and measured its binding energy. Taking into account polaron effects, we estimated the bare electron effective mass in the ${\ensuremath{\Gamma}}_{1}$ minimu…
Conditions are indicated whereby the antireflective function can be extended to coatings comprising any number of thin layers. This property is obtained by addition of two supplementary layers, the optical characteristics of which are calculated in the present paper. Conditions for the existence of solutions are obtai…
High resolution electron microscope images can provide us with the configurations of relatively heavy metal atoms in both perfect and disordered crystals directly in some favorable cases. The information available is limited to two-dimensional projections. Within this limitation, however, it has been possible to study…
Dislocation damping was studied in 〈110〉 Cu crystals containing 0≲c0≲4×10−2 atom fraction Ni at 95≲T≲297 °K, strain amplitudes ε0 from the mid-10−7 to the mid-10−4 range, and frequencies f≈22 kHz. Dislocation interactions with the combined Suzuki-Cottrell atmosphere are analyzed to explain the composition dependence a…
M-LiTa30 8, monoclinic, C2/c, a = 9.410 (1), b = 11.521 (1), c = 5 .0506(5) /k, f l = 91 .108(5) ° , Z = 4. The location of the lithium ion in the structure has been determined by profile analysis of powder diffraction data. Introduet|on. M-LiTa30 8, stable between 800 and 1100°C, has been identified by Roth, Parker,…
High pressure optical studies have been made on a series of crystalline therochromic and photochromic anils and model compounds. Measurements include absorption and emission peak locations and the integrated intensities of various absorption peaks including the uv peak and visible peaks introduced thermally or by irra…
Abstract For the solid state reactions in powdery state, two steps reaction was assumed, initial rapid surface reaction and later diffusion controlled reaction which obeys J ANDER'S kinetics after completion of the surface layer. In the case of much larger diffusion rate in the surface layer, the measured fraction of…
The phonon scattering by vibrating dislocation dipoles and the scattering by twin boundaries are discussed to explain the thermal conductivity of deformed crystals of bismuth and its dilute alloys. The scattering of phonons by vibrating dislocation dipoles was calculated by employing Ninomiya's formulae of eigenvibrat…
Les études magnétiques, par spectrométrie Mössbauer, par diffraction des neutrons et des rayons X sur les composés MM'P et MM'As ont mis en évidence un ordre très marqué des métaux de transition 3d et 4d, qui ne peut s'expliquer simplement que dans une description cristallochimique analogue à celle des oxydes. Les 4 f…
A simple approach to the alignment of short fibers moving in an air stream was explored, in which transverse air jets acted to alter main stream velocity and direction in a desired manner. An approximate analysis was developed for the effects of aerodynamic forces on fiber motion and was combined with a theory for the…
Abstract Die Schwingungsfrequenzen von Ba 2 ZnTeO 6 werden den ecken‐ und flächenverknüpften TeO 6 ‐Oktaedern zugeordnet. Beide Oktaedersorten unterscheiden sich in Kraftkonstanten, Bindungsordnung und TeO‐Abständen.
The physical properties of radiation- and sulfur-cured poly(butadiene–co–styrene)-based stocks were compared. It was found that the measured lower ultimate strength of radiation-cured stocks is in part attributable to the difference in the glass transition temperatures of the stocks cured by the two methods (an increa…
Phenyl methyl silicone fluids of low phenyl radical concentrations and low viscosities are characterized by their extraordinary gasabsorbing property in high electric fields. Their physical, chemical and electrical properties were investigated and compared with those of dimethyl silicone fluids. The corona resistant c…
The kinetics of growth of KDP crystals from aqueous solution has been examined at various supersaturations and temperatures, when stable supersaturated solutions have been injected with KDP seed crystals. The growth rate has been determined from measurements of the increase in the weight of a crystal. In the unagitate…
Dix (1976) recently has proposed that a “true experiment” be conducted to assess the validity of predictions of imminent violence. A random sample of persons predicted to be iminently violent would be denied emergency civil commitment in order to test whether they do, in fact, commit a violent act. This article analyz…
The mass-yield distribution of fission products following photofission of $^{232}\mathrm{Th}$ using peak bremsstrahlung energies of 9, 15, and 38 MeV were measured by $\ensuremath{\gamma}$ spectrometry for 25 mass chains in the light and heavy mass wings. Fission yields for mass chains 85, 87, 88, 138, and 146 were me…