Materials Literature
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The effects of temperature and strain rate on dislocation glide at constant structure in nickel and nickel alloys are summarized in terms of their dependence on structure, making expanded use of a diagram introduced by Haasen. New results on the temperature and strain-rate dependence of the rate of strain hardening in…
The formation of metastable phases in non-equilibrium processing techniques is still not understood quantitatively. This is mainly a result of the lack of detailed information on kinetic constraints and the thermodynamics of the systems investigated. In this paper a thermodynamic approach for the interpretation of met…
The influence of annealing twin density on CSL distributions in f.c.c. materials is discussed. Geometric considerations are presented which show that as a consequence of both energetic and crystallographic constraints associated with twinning, a CSL distribution consisting entirely of low-Σ boundaries is attainable. C…
Abstract During the vulcanization of cis ‐1,4‐polyisoprene (IR) with thiruam‐related curing systems, dimethyldithiocarbamic acid (DMDCA) is formed as a byproduct, in the formation of either pendent groups or crosslinks. DMDCA is unstable, and decomposes instantly to Me 2 NH and CS 2 in the absence of ZnO. The facile r…
For pt.I see ibid., vol.3, p.7831 (1991). A recent theory of transport in ionic conducting glasses treats dielectric relaxation in a pair approximation at high frequencies, an augmented pair approximation at intermediate frequencies, and a cluster theory at low frequencies (below the alpha -peak in the imaginary part…
Structural properties and medium-range order (MRO) in calcium metasilicate (CaSiO3) glass are investigated at different concentrations of calcium oxide through the molecular dynamics technique. Calculations are based on the Born–Mayer–Huggins potential, and show that the experimental Ca–Ca partial structure factor, wh…
A TiN-encapsulated copper structure was made by annealing a Cu-10 at. %Ti alloy film evaporated on a SiO2/Si(100) substrate at 550 °C in a NH3 ambient. A fast heating rate (70 °C/min) to 550 °C can effectively suppress the formation of Cu3Ti and enhance the TiNx formation near the surface of the copper film. Oxygen in…
We used diffusing wave spectroscopy to determine the phase diagrams of binary mixtures of charge-stabilized colloidal particles of different dimensions in the low-screening limit. As the ratio of radii r=${\mathit{r}}_{1}$/${\mathit{r}}_{2}$ was increased progressively towards 1, the structure of the diagrams evolved…
We have used a scanning-tunneling-microscope tip as a source of both electrons and holes to study injection luminescence from CdS(112\ifmmode\bar\else\textasciimacron\fi{}0) surfaces cleaved in UHV. Band-gap radiation and emission from radiative deep levels are resolved in optical spectra. Isochromat photon-intensity…
We have calculated, by means of ab initio techniques, the equilibrium geometries, total energies, binding energies, and fragmentation energies for the clusters ${\mathrm{B}}_{\mathit{n}}$, with n=2--8, in both the neutral and cationic states. The ionization potentials for the neutral clusters have also been calculated…
The one- and two-electron ground-state energies of a silicon sphere embedded in an amorphous silicon dioxide matrix are calculated as a function of the sphere size. The electron-electron interaction and polarization effects are treated by perturbation; our quantum-mechanical calculation is valid for small spheres with…
Abstract The relation between atomic structure and elastic properties of grain boundaries is investigated theoretically from both atomistic and continuum points of view. A heterogeneous continuum model of the boundary is introduced where distinct phases are associated with individual atoms and possess their atomic lev…
We describe a phenomenological model for the thermal fluctuations of a three-phase contact line in the case of three fluid phases. The model is an extension of an earlier model for the case of two fluids and one solid. In the previous model only one interface was allowed to fluctuate, and the contact line was constrai…
Ci0H6FI2NiO6, M,=508.9, monoclinic, C2/c, a = 21.195 (5), b = 8.247 (2), c = 9.741 (2) ,/3 = 95.91 (2) °, V = 1693.6 (7) )~3, Dx = 1.996 Mg m-3, Z=4, #=1.298mm-1, A(MoKa)=0.71073./~, F(000)=1000, T=298K, R=0.0369 and wR = 0.0645 for 157 variable parameters (S= 0.59) and 1112 reflections with F>0~r(F). The Ni atom pos…
We describe a phenomenological model for the thermal fluctuations of the line of contact between two fluid phases and one solid phase. The line of contact between the three phases is constrained to lie along the solid surface, which is assumed to be smooth, flat, and horizontal with respect to gravity. In order to mod…
In order to test the proposal that the anomalous valence-level photemission spectrum of Am results from a divalent (5${\mathit{f}}^{7}$) surface layer, we have performed variable-takeoff-angle experiments on the metal. 4f spectra obtained at 10\ifmmode^\circ\else\textdegree\fi{} and 85\ifmmode^\circ\else\textdegree\fi…
Synchrotron radiation soft x-ray photoemission spectroscopy was used to characterize the surface chemistry of p-InP before and after exposure to H2S gas at ambient temperature. The effect of the H2S dosing was determined by in situ photoemission measurements which were acquired after each gas exposure in order to obse…
Quasielastic light-scattering measurements are reported for a chiral smectic-C material as a function of enantiomer concentration and applied electric field. The elastic constant ${\mathit{B}}_{1}$ and associated viscosity have been determined. More importantly, it was found that ${\mathit{B}}_{1}$ is composed of a ba…
The dielectric properties and positron annihilation lifetime spectra of the ceramics with the nominal composition Sr1−xLaxTiO3 (0≤x≤0.06) were measured. The dielectric properties and relaxation behaviors, which varied obviously with lanthanum content, were explained by a charge compensation model. The defect structure…
Absorption, excitation and emission spectra and lifetime measurements in cerium-doped lanthanum fluoride single crystals were obtained using both one- and two-photon spectroscopy techniques. It is shown that two kinds of fluorescent centres are present. In weakly doped systems, a rapid fluorescence around 300 nm domin…