Materials Literature
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Photoemission spectra of the valence band of single-crystal graphite were measured using synchrotron radiation in the energy range 33-200 eV. For $\ensuremath{\hbar}\ensuremath{\omega}=122$ eV, good agreement was found with the calculated density of states since the matrix elements for the $p$-like and $s$-like states…
An attempt is made to describe the kinetics of diffusionless first order phase transformations in terms of the time-dependent Landau–Ginzburg equation. A steady-state solution to the equation is presented such that an interface may propagate with a shape-preserving profile under constant supercooling. The laws of grow…
Microwave and far-infrared absorption have been studied in several chalcogenide and oxide glasses (${\mathrm{As}}_{2}$${\mathrm{Se}}_{3}$, ${\mathrm{Tl}}_{2}$Se${\mathrm{As}}_{2}$${\mathrm{Te}}_{3}$, 3Si${\mathrm{O}}_{2}$ \ifmmode\cdot\else\textperiodcentered\fi{} ${\mathrm{Na}}_{2}$O) at frequencies between 0.1 and 1…
The electrochromic optical absorption of mixed-oxide WO3/MoO3 amorphous films occurs at higher energy than either pure oxide alone. The systematics of the energy shifts as a function of MoO3 concentration and coloration density is determined. The data is explained by the intervalency charge-transfer model if we assume…
LEED calculations are presented which indicate that the emergence of a non-specular beam is accompanied with a surface resonance fine structure in the intensity of the specular beam. It is shown that the fringes of the fine structure are arranged in a Rydberg series having the constant 1 / 16 Rydbergs and terminating…
Using precise lattice-parameter measurements, "cubic" ${\mathrm{Na}}_{x}\mathrm{W}{\mathrm{O}}_{3}(0.62<~x<~0.94)$ has been found to transform from the ideal perovskite structure to three other related forms. The transition sequence is described in terms of a single vectorlike order parameter involving static in…
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…