Materials Literature
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A theory for inelastic Mie scattering from rough metal surfaces or metal sols is proposed. A resonant excitation of a localized dipolar plasmon can enhance the cross section, and experimental data relating to the phenomenon in silver and copper are presented. Two distinct effects are noted. One is inelastic light scat…
We have measured the temperature dependence of the velocity of 10-MHz ultrasonic pulses which were propagated along the layers of the dichalcogenides $2H$-Ta${\mathrm{S}}_{2}$, $1T$-Ta${\mathrm{S}}_{2}$, and $2H$-Nb${\mathrm{Se}}_{2}$. In $2H$-Ta${\mathrm{S}}_{2}$ the plate mode velocity shows little temperature depen…
The organic donor hexamethylenetetrathiafulvalene (HMTTF) forms charge-transfer salts with both tetracyano-$p$-quinodimethane (TCNQ) and its tetrafluoro derivative (TCNQ${\mathrm{F}}_{4}$). We report here the preparation, structure, and conductivity of HMTTF-TCNQ${\mathrm{F}}_{4}$. This salt is found to be isostructur…
We have studied the localized vibrational modes of boron in heavily doped Si using Raman scattering for carrier concentrations of 5\ifmmode\times\else\texttimes\fi{}${10}^{18}$ to 1.5\ifmmode\times\else\texttimes\fi{}${10}^{20}$ ${\mathrm{cm}}^{\ensuremath{-}3}$. The line shapes and positions of the local mode and opt…
The phonon dispersion curves of the fast ionic conductor ${\mathrm{Li}}_{3}$N have been determined in the high-symmetry directions $\ensuremath{\Sigma}$, $\ensuremath{\Delta}$, and $T$ by coherent inelastic neutron scattering at room temperature. The elastic constants ${c}_{11}$, ${c}_{33}$, ${c}_{44}$, and ${c}_{66}$…
We have investigated the single-crystal ionic conductivity of Na5YSi4O12. The conductivity is found to exhibit a thermally activated temperature dependence between 200 and 500 K with activation energies of 0.221 and 0.203 eV parallel and perpendicular to the hexagonal c axis. Room-temperature conductivities were deter…
Single crystals of N${\mathrm{H}}_{4}$${\mathrm{N}\mathrm{i}[{\mathrm{S}}_{2}{\mathrm{C}}_{2}{(\mathrm{CN})}_{2}]}_{2}$. ${\mathrm{H}}_{2}$O have been grown. The single-crystal resistivity in the high-conductivity direction ($\ensuremath{\rho}\ensuremath{\simeq}20$ \ensuremath{\Omega} cm) is the lowest observed for sa…
Valence-band spectra from single crystals of Ir${\mathrm{O}}_{2}$ reproduce the general features of a recent band-structure calculation. Good agreement with the unusual asymmetric core-electron line shapes is obtained by a perturbation-theory treatment of the $d$-electron many-body screening response.
The various effects that can occur when the primary electron energy, ${E}_{p}$, is varied in a reflection-energy-loss experiment are considered. For ${E}_{p}\ensuremath{\ge}100$ eV, the dominant effect is an increase of the electron mean free path with increasing ${E}_{p}$. By performing energy-loss measurements with…
In order to elucidate the structural details of doped polyacetylene (a highly conducting organic polymer), the optical absorption, Raman, and infrared spectra of not only trans-(CH)x doped with iodine, AsF5, and SO3 but also β-carotene doped with iodine and SO3 were studied. The infrared spectra of two kinds of isotop…
Measurements of charging and discharging currents in polyvinylidene fluoride (PVF 2 ) were made over a wide range of fields, temperature, and a limited range of sample thickness and electrode materials. Experimental results suggest that dipolar re-orientation and space charge relaxations are dominant mechanisms for th…
An analysis of the continuum equations of nematic layers subject to large electric or magnetic fields leads to simple extrapolation procedures which allow the infinite field capacitance of the layers to be inferred. For a magnetic aligning field H the reciprocal of the capacitance should be plotted against 1/H, wherea…
The 21 chapters cover: nuclei and isotopes, nuclear mass and stability, decay, cosmic radiation and elementary particles, nuclear structure, nuclear reactions (energetics, mechanisms and models), accelerators and neutron sources, production of radionuclides, thermonuclear reactions and nucleogenesis, naturally occurri…
Shear and longitudinal velocities were measured by the ultrasonic phase comparison method as a function of pressure to 8 kbar on synthetic glasses of basalt, andesite, rhyolite, and quartz composition and on natural obsidian. Velocities of most of the glasses decrease anomalously with pressure, but increasingly more‐n…
It is observed that the line shapes of core levels in photoelectron spectroscopy of Ti, Th, and Ce and some of their intermetallic compounds and lanthanide oxides are directly related to the degree of localization of screening orbitals.
The long-period helical magnetic structures in MnSi and FeGe are shown to be consequences of a ferromagnetic Dzyaloshinskii instability (1964). Renormalisation group theory predicts the transition to be first order, in agreement with experiments on MnSi.
When a crystal grows or dissolves in a solution the matter has to pass through a diffusion field.If the crystals do not move relative to the surrounding liquid their growth or dissolution rate may be controlled by diffusion through the solution.Crystals of micrometer size or smaller in aqueous solution may be treated…
This Letter reports the first ultrahigh-vacuum study of surface-enhanced Raman scattering from pyridine adsorbed on a clean single-crystal silver surface containing a smooth modulation (1 \ensuremath{\mu}m periodicity) to allow optical coupling to surface plasmon polaritons. A large mode-selective enhancement (\ensure…
It is shown how the molecular weight dependence of the radius of gyration ${R}_{F2}$ of two-dimensional polymeric chains can be derived from surface-pressure isotherms in Langmuir monolayers. ${R}_{F2}$ scales as ${N}^{\ensuremath{\nu}}$ with $\ensuremath{\nu}=0.56$ for polymethylmethacrylate and 0.79 for polyvinylace…
Article The Influence of DO3Order on the Martensitic Transformation in CuZnAu and CuZnAl Alloys was published on November 1, 1980 in the journal International Journal of Materials Research (volume 71, issue 11).