Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochromism in the mixed-valence hexacyanides. 1. Voltammetric and spectral studies of the oxidation and reduction of thin films of Prussian blueD. Ellis, M. Eckhoff, and V. D. NeffCite this: J. Phys. Chem. 1981, 85, 9, 1225–1231Publication Date (Print):April 1, 1981Publ…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTCrystallographic refinement and atomic models of a human Fc fragment and its complex with fragment B of protein A from Staphylococcus aureus at 2.9- and 2.8-.ANG. resolutionJohann DeisenhoferCite this: Biochemistry 1981, 20, 9, 2361–2370Publication Date (Print):April 1, 1981Publ…
The Rietveld [J. Appl. Cryst. (1969), 2, 65–71] method of structure refinement from powder diffraction patterns is widely used with neutron data and increasingly so with X-ray data. A computer program for the application of the method with X-ray data, or with neutron nuclear scattering data, has been written ab initio…
A broad review of recent research work on the preparation and the remarkable properties of intercalation compounds of graphite, covering a wide range of topics from the basic chemistry, physics and materials science to engineering applications.
Escherichia coli dihydrofolate reductase was shown to follow slow transient kinetics (hysteresis). Nonlinear reaction velocities were detected during the enzyme assay and required 10-15 min to reach a steady-state rate. The degree of hysteresis was influenced by the enzyme concentration and the order of substrate addi…
An analysis is made of the theory of the luminescence spectra of semiconductors with direct optical transitions involving recombination of nonequilbrium carriers whose energies are close to the band gap edges. The usual formulation of the theory of recombination is employed, i.e., given densities of free electrons and…
The information contained in an Auger-electron-photoelectron coincidence spectroscopy (AEPECS) experiment for $\mathrm{XXV}$, $\mathrm{XYV}$, and $\mathrm{XYZ}$ Auger processes when a single $X$ level is involved is discussed. For finite systems AEPECS gives information about the spatial character of the excited state…
Abstract PE spectral comparisons of the title compounds with the corresponding O ‐ and N ‐methyl fixed derivatives show that both 2‐ and 4‐quinolone exist as the NH forms in the vapour phase: none of the OH tautomers could be detected.
Evidence for superconductivity in the organic conductor di-(tetramethyltetraselenafulvalenium)-perchlorate [${(\mathrm{TMTSF})}_{2}$Cl${\mathrm{O}}_{4}$] has been found by resistance measurements in the absence of applied pressure. For different crystals the transitions are approximately 0.3 K wide and are centered ar…
Polarised Raman spectra of chloro- and bromo-sodalite (Na 4 Al 3 (SiO 4 ) 3 Br) 2 single crystals have been recorded, and 28 of the predicted 32 Raman-active phonon modes observed. A full group-theoretical analysis of the zone-centre phonons is given. The internal modes are assigned using as a basis the normal mode fr…
Abstract A historical survey about the development of Ziegler‐Natta catalysts for polymerization of propylene is given. After having employed catalysts based on titaniumtrichloride for several years, in the 70's catalysts of the so‐called second generation were introduced, which are more effective and yield products o…
New developments in Cu2S thin-film technology allow, in principle, the combination of Cu2S with semiconductors other than CdS or Cd1−xZnxS for solar cell purposes. We discuss here a pn+-type Cu2S-ZnO structure that offers some basic advantages over existing structures. Our analysis predicts a practically achievable ef…
Natural ultramarine and alkali borate glasses doped with sulphur are investigated by means of ESR and optical spectroscopy. A comparison of optical and ESR spectra makes it possible to conclude that the blue colouring (absorption band within the range 585 nm) and the anisotropic ESR signal (g1 = 2.003, g2 = 2.032, g3…
The macroscopic properties of the plastic deformation of a simple model crystal which obeys the Friedel relation are compared with computer simulation data and some in the literature unnoticed differences are discussed. It is pointed out that the random distribution of obstacles causes on average activation energy ΔG0…
There is increasing interest in the measurements of the dielectric absorption of compressed solid powders. A theoretical analysis is reported which highlights the problems which may arise due to “lack of contact” between the material and the electrodes. It is demonstrated, both theoretically and experimentally, that s…
It is observed that a reversible step period rearrangement on clean nickel single-crystal surfaces occurs in the immediate vicinity of the Curie temperature. Reversible carbon segregation is observed on the same crystal surfaces below the Curie point. The segregated carbon is carbidic, not graphitic, and indicates a c…
Magnetic and crystallographic nature of the compounds NiMnGe1−nSin (0 ≦ n ≦ 1) are studied in the temperature range from 80 to 1000 K by X-ray and neutron diffraction, magnetometric and DTA measurements. On the basis of these experimental data, crystallographic and magnetic phase diagram are constructed. The compounds…
A theoretical study of topological excitations (kinks) in a one-dimensional one-third-filled Peierls system is presented. The charges associated with the kinks are found to be fractional $Q=\ifmmode\pm\else\textpm\fi{}\frac{1}{3}e,\ifmmode\pm\else\textpm\fi{}\frac{2}{3}e$. Calculations of the spatial widths and electr…
A theory for geminate electron-hole recombination in amorphous semiconductors is given, which includes the effects of both diffusion and tunneling. The exact solution of the model is obtained neglecting the Coulomb interaction, which is included later in the prescribed diffusion approximation. It is shown that any com…
A comprehensive study of the Rayleigh–Brillouin scattering spectra of o-terphenyl in the liquid and supercooled liquid state has been carried out. Anomalies in the Brillouin frequency and linewidth data are observed at the glass transition temperature (Tg) and at a temperature (TK) about 36 K higher than the melting p…