Materials Literature
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The interaction of CO with a (110) nickel surface has been investigated using a number of techniques. Auger electron spectroscopy was used to follow the chemical composition of the surface. Using LEED, two ordered chemisorbed CO structures were found to form on the clean surface at room temperature. A (2 × 1) structur…
Fowler's hypothesis commonly used to interpret results of photoemission into the vacuum has been extended to deal with the problem of internal photoemission. This leads to the empirical relation $Y\ensuremath{\propto}{(E\ensuremath{-}{E}_{t})}^{2}$ between the quantum efficiency $Y$ and the photon energy $E$, currentl…
The theory is developed for thermally stimulated currents (TSC) that flow in optically or electrically excited insulators and semiconductors in which the field is sufficiently high and the (active) region in which the free carriers are generated is sufficiently thin (e.g., reverse-biased junctions, thin films, etc.) s…
The dispersion of the Raman cross sections of several phonon modes in CdS and ZnO using a wide range of laser energies has been measured. The ${E}_{1}(\mathrm{LO})$ and multi-LO (2-LO, 3-LO and 4-LO) modes in CdS have been studied over the energy range extending from $0.45{E}_{\mathrm{ex}}$ (exciton energy) to $1.1{E}…
Infrared-reflectivity spectra have been obtained for a large number of group-IV (Ti, Zr, Hf) and group-VI (Mo, W) transition-metal dichalcogenides. Three distinct types of spectra have been identified: In Zr${\mathrm{S}}_{2}$, Hf${\mathrm{S}}_{2}$, and Hf${\mathrm{Se}}_{2}$, very strong reststrahlen with effective cha…
Uniformly oriented thin liquid-crystal layers are required for most liquid-crystal device applications and physical investigations. Usual methods for obtaining orientation rely on a substrate interface which has an orienting action on the liquid-crystal molecules. In previously described methods the orienting interfac…
The refractive-index behavior (magnitude and dispersion) of a variety of optical glasses and amorphous semiconductors is discussed within the same oscillator framework applied earlier to single-crystal refractive-index data. Apart from density differences associated with voids and inefficient packing of disordered ato…
The kinetics of vacancy production have been studied in high-purity MgO powders after irradiation by 20 MeV protons. The rate of formation of cation vacancies fits a model of interstitial-vacancy recombination. Isochronal annealing curves show that the cation vacancy is destroyed over a narrow temperature range betwee…
A macroscopic theory of surface polaritons on semi-infinite magnetic media is presented. The general nature of surface polaritons on magnetic media is discussed. In the configuration k, M 0 , and n mutually perpendicular (where k is the propagation wavevector, M 0 is the static magnetization of the medium, and n is th…
An investigation has been made of the photon pulses and the associated current pulses in the pre-onset stage of a positive point corona in air at atmospheric pressure. The transition from burst pulses to streamer pulses is discussed.
We have measured the correlation range for fluctuations of the orientational order parameter in the isotropic phase of the liquid crystal $p$-methoxy benzylidene, $p\ensuremath{-}n$ butyl aniline (MBBA). The correlation range was found to diverge as ${(T\ensuremath{-}{T}_{c}*)}^{\frac{\ensuremath{-}1}{2}}$, in agreeme…
We have measured the valence-band density of states and the energies of the core levels of crystalline and amorphous GeTe with x-ray photoemission. The density of states of the amorphous form is found to be very similar to that of the crystal. The present results indicate that the atomic orbitals primarily determine t…
Brillouin-scattering results are reported for monodomain samples of $\ensuremath{\beta}$-methyl butyl $p$ [($p$-methoxy benzylidine)amino] cinnamate in both the smectic-$A$ and -$B$ phases. For both phases theoretical predictions are confirmed concerning the number and polarizations of the propagating hypersonic waves…
Article Verträglichkeit zwischen Materialkomponenten ın Metall-Keramik-Verbundwerkstoffen was published on April 1, 1973 in the journal International Journal of Materials Research (volume 64, issue 4).
The distortions occurring due to the image formation system of the scanning electron microscope are considered with respect to their origins and their effect on the micrographs obtained. A method for evaluating the distortion and subsequently correcting angular or linear measurements made from SEM micrographs is prese…
Using temperature as a pitting criterion, a critical pitting temperature has been defined for molybdenum-bearing austenitic stainless steels containing nominally 18% Cr which provides a quantitative measure of their pitting resistance. Single phase alloys had increasing resistance to pit initiation with increasing Mo…
The pressure required to cause a spinning solution to flow through the spinnerette hole in a wet-spinning process has been found to decrease as the take-up velocity V1 is increased. The amount of pressure reduction from free extrusion, where V1 = Vf, to V1 denoted by p(Vf)–p(V1) was found to correlate well with the te…
A series of tests have been conducted to measure the effects of fatigue loading on environmental stress crazing in PMMA. Testing in methanol has shown that long crazes are grown prior to fracture in the same manner as previously observed for constant-load conditions. An analytical model which had been used to describe…
Experimental microstructural evidence is presented to show that the intervortex spacing decreases monotonically with increasing applied voltage beyond the ``secondary'' hydrodynamic threshold for all doped negative nematic liquid crystal films.
The importance of lateral pressure in the tension and bending behaviour of yarns and fabrics is discussed. To determine the lateral pressure between fibres, a specific model is considered, that of a filament helically wound around a cylinder. The equations governing the equilibrium of the filament are derived and both…