Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStrong metal-support interactions. Group 8 noble metals supported on titanium dioxideS. J. Tauster, S. C. Fung, and R. L. GartenCite this: J. Am. Chem. Soc. 1978, 100, 1, 170–175Publication Date (Print):January 1, 1978Publication History Published online1 May 2002Published i…
Abstract Lattice images of the niobium oxides, structures based on the linkage of octahedral groups in continuous networks, occasionally contain features recognizable as dislocations. Since lattice imaging enables the micro-structure to be resolved in great detail, at the level of local structural organization, it is…
Defects introduced by high energy electron irradiation at low temperatures have been studied in manganese doped RbMgF 3 . At these low temperatures negative-ion vacancies are not mobile and only the various radiation induced interstitials and X 2 - (V K ) centres are mobile. It is found that at 15K where X 2 - centres…
The magnetic susceptibilities parallel and perpendicular to the chain axis have been measured in the three linear ferromagnets TMNC, TMNB and CsNiF 3 between 1.2 and 77K. Strong anisotropy is observed at low temperature. The variation of chi //c with temperature is in good agreement with the predictions of the quantum…
Presents room-temperature measurements of the in-plane resistivity (j,E perpendicular to c) and Hall coefficient (j perpendicular to c ,B/sub //c/) of TiSe 2 and TiS 2 as a function of pressure. With pressure both the resistivity and Hall coefficient decrease rapidly in TiSe 2 ; this the authors interpret in terms of…
In Nb${\mathrm{Se}}_{3}$ one-dimensional diffuse scattering was observed above 140 K and the satellite spots at a lower temperature. They correspond to the Kohn anomaly and the superlattice coupled with charge-density wave, respectively. The superlattice was found to be incommensurate, with the period ${a}^{\ensuremat…
Whewellite and weddellite, calcium salts of oxalic acid, have been found in the litter layer of several different soils, indicating that oxalate is a major metabolic product of fungi in natural environments. The presence of oxalate in soil solution speeds weathering of soil minerals and increases the availability of n…
The programming of the R-matrix method recently used to calculate total and partial atomic photoionisation cross sections has been extended to enable photoelectron angular-distribution beta parameters to be studied for a general atomic system. The program has been used to calculate the beta -parameters for photoelectr…
Earlier ideas are combined to produce a systematic approach both to forming the bulk equations of motion of a dilute suspension and to calculating the overall hydrodynamic interactions between the suspended particles. Equations governing averaged field quantities are derived by taking ensemble averages of the conserva…
The change in the grain-boundary structure during superplastic deformation of a magnesium alloy (Mg + 1.5% Mn + 0.3% Ce) is investigated by diffraction electron microscopy. The presence of linear defects, extrinsic grain-boundary dislocations (EGBD), is established, whose density depends weakly upon the degree of exte…
A low-energy argon ion-beam sputtering system was developed and applied to serial sectioning in a radiotracer study of “low”-temperature self-diffusion of copper. Very thin uniform sections with thicknesses between several nm and a few hundred nm were removed from copper single crystals of extremely low dislocation de…
The molecules MnO, MnO2, MnO3, and MnO4 have been prepared by the vaporization and reaction of manganese atoms with O2, N2O, or O3 and isolated in various inert-gas matrices at 4 °K. ESR has been used to determine magnetic parameters which are interpreted in terms of molecular geometry and electronic structure. MnO is…
Using the time-differential Mössbauer coincidence technique we have measured emission spectra of [57Co(phen)3] (ClO4)2⋅2H2O (phen=1, 10-phenanthroline) in the temperature range 10–80 K versus K4[Fe(CN)6]⋅3H2O as absorber. The lifetimes of the unstable 57Fe(II) high-spin states (5T2), which are formed as a consequence…
The optical constants relative to each crystallographic axis of Ga monocrystals in the range 0.3-5 eV have been determined from reflectance measurements at normal incidence with the light being polarized parallel to each axis. We report on thermoreflectance spectra and give the corresponding changes in the dielectric…
Thermal quenching of Li-doped MgO crystals from temperatures in excess of 1300 K results in the formation of ${[\mathrm{Li}]}^{0}$ defects, which are substitutional lithium ions each with a bound hole at a neighboring oxygen site. Unlike ${[\mathrm{Li}]}^{0}$ defects generated at low temperatures by a low dose of ioni…
Decay patterns of trapped electrons in aqueous glasses have been analyzed over the time span of more than eight decades in terms of a time-dependent "rate constant" of the form ${t}^{\ensuremath{\alpha}\ensuremath{-}1}$, $0<\ensuremath{\alpha}<1$, which can be derived from the long-tail hopping-time distribution…
Using a Si surface model involving interference between two rippled-surface double layers, a kinematic analysis of low-energy-electron-diffraction (LEED) intensities of all fractional-order spots has been completed and compared with recent experimental LEED 7 \ifmmode\times\else\texttimes\fi{} 7 intensity data. Since…
A" the baris oJ cOlltilluum model , theoretical equatioll which describes a stress-straill cllrve oJ dual phase steel is built up Jrom the stress-straill curves oJ each composite phase.The comparisoll oJ theorelical result, with experimenla l onts is made on the cOlltilll/ously alll/ealed dual phase steel which is com…
Ultraviolet photoemission spectroscopy (UPS) has been used to study the valence-band electronic structure of $2H\ensuremath{-}\mathrm{M}\mathrm{o}{\mathrm{S}}_{2}$. The samples were cleaved or heated in ultrahigh vacuum of \ensuremath{\sim} 1 \ifmmode\times\else\texttimes\fi{} ${10}^{\ensuremath{-}10}$ Torr to achieve…
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…