Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Abstract An atomistic study of tilt grain boundary structures in f.c.c. metals has been made. The principal aim of this study is to understand the structure of long-period (‘general’) tilt boundaries. Boundaries for which Σ< 491 were considered, where Σ is the reciprocal density of coincidence sites. The work i…
The disorder formation in quartz crystals by implantation of He+, B+, and Ar+ ions at room temperature is investigated by Rutherford-backscattering spectrometry (RBS). The efficiency of the process of damage production is strongly dependent on the energy deposition mechanism and the degree of disorder. Three character…
The effective threshold energy for atom displacement is measured in molybdenum single crystals in a high-voltage electron microscope. Displacement is monitored at 70 K ≦ T ≦ 300 K by observing the nucleation of interstitial dislocation loops, and at 500 K ≦ T ≦ 800 K by measuring the growth rate of previously induced…
An experimental and theoretical study of nonlinear acoustic propagation in a typical glass, fused silica, is presented, at frequencies near 1 GHz and temperatures below 1 K. The data are interpreted within a general framework of pulse propagation in an inhomogeneously broadened two-level absorber. Numerical solutions…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text Craig F. Bohren and Timothy J. Nevitt, "Absorption by a sphere: a simple approximation," Appl. Opt. 22, 774-775 (1983) Export Citation BibTex Endnote (…
High-field magnetoresistance measurements are shown to provide a sensitive characterization technique for graphite fibers with such a high degree of crystalline perfection that conventional characterization techniques are insensitive, including x-ray linewidth measurements, intensity of disorder-induced features in th…
We report here a Monte Carlo study of the thermodynamic and structural properties of a two-dimensional system of 2500 particles interacting by a repulsive inverse sixth power potential. Particular effort was made in the melting region, both to identify the defect structures and to ascertain the thermodynamic changes a…
Electronic Hamiltonian matrix elements between initial and final zeroth order states associated with electron exchange in the hexa-aquo Fe2+/Fe3+ redox system have been calculated in terms of self-consistent field (SCF) ab initio wave functions. The face-to-face and apex-to-apex approach geometries of the quasioctahed…
Brillouin scattering in BiV${\mathrm{O}}_{4}$ was measured at temperatures up to 850 K, with particular emphasis on the dependence of Brillouin frequencies on the propagation direction of phonons in a tetragonal (001) plane as well as their temperature dependence. The angular dependence has revealed that the direction…
Total and partial ionic and electronic $c$-axis dc conductivities were measured for single-crystal ${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$:8 ppm Mg as a function of oxygen pressure and temperature. The sample is unsaturated at $T>1360$ \ifmmode^\circ\else\textdegree\fi{}C but is saturated in equilibrium with a spinel…
Gold decoration of the basal lattice plane of graphite etched by atomic oxygen has been made possible by first desorbing the surface oxide layer on the basal plane. The formation of monolayer pits, as revealed by gold decoration, shows that anisotropy does exist, i.e., carbon atoms are preferentially attacked by atomi…
It is shown that the Mayer–Montroll (MM) and Kirkwood–Salsburg (KS) hierarchies of equilibrium statistical mechanics for a binary mixture under certain limits become equations for the n-point matrix probability functions Sn associated with two-phase random media. The MM representation proves to be identical to the Sn…
A series of experiments on the physics and chemistry of polymers derived from pyrroles show that the oxidation of neutral insulating polypyrrole (PP0) to its conducting counterpart (PP+) is a multistep process. In particular, the conductivity of the polymers increases only in the early stages of oxidation, whereas sig…
The diffusion coefficients of nitrogen in polycrystalline α-Ti have been measured by annealing nitrogen-implanted titanium samples in the low-temperature region, i.e., 450–700 °C. The nitrogen profiles were probed with the ( p,γ) resonance broadening method. The implantation energies were 20–60 keV and the fluences we…
Gratings of dielectric material can act as homogeneous birefringent materials if the wavelength of the incident radiation is greater than twice the period of the grating. For the case of square profile gratings, simple equations predict the birefringence versus linewidth-to-period ratio of the gratings. By using x-ray…
Surface-atom core-level shifts from evaporated noble metals are reported using angle-dependent x-ray photoemission with monochromatized $\mathrm{Al}K\ensuremath{\alpha}$ radiation. The absence of line broadening with increasing takeoff angle for the case of aluminum metal, where the surface shift is known to be small,…
Single- and many-particle effects contributing to the formation of energy-band gaps in semiconducting polymers are investigated using exact-exchange Hartree-Fock (HF) theory and Toyozawa's electronic-polaron model. The electron correlation is calculated by M\o{}ller-Plesset perturbation theory including explicitly all…
Abstract The paper describes a novel technique for synthesizing diamond, which relies on the build-up of extra diamond lattice planes within the bulk crystal. This is achieved by the implantation of high energy (say 20 keV) carbon ions into a heated diamond crystal. Carbon ions of this energy range come to rest hundre…
Abstract In this paper a crystallographic framework and methodology are presented that enable the derivation of the symmetry of any bicrystal comprising a planar interface between two crystals of the same or different form. If the crystals are different the interface is an interphase boundary, and if they are the same…
Surface-plasmon-polariton-mediated luminescence is observed when electrons are injected into thin Al films from the conduction band of Si${\mathrm{O}}_{2}$. These electron-injector structures are strikingly similar to light-emitting tunnel junctions, although tunneling can be ruled out as the driving mechanism. The em…