Materials Literature
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Equivalent circuit modelling of electrochemical systems using AC impedance analysis is a widely accepted technique. However, there are systems for which the method is not well suited, and the current interrupt technique can sometimes be used as an alternative method of establishing a circuit model. The current interru…
Im IR‐Bereich liegt die π,π*‐Absorptionskante (Q‐Bande) des löslichen Porphyrinpolymers 1 , die obendrein ungewöhnlich intensiv ist. Elektroabsorptionsspektren zeigen, daß das Polymer 1 eine sehr große nichtlineare Suszeptibilität dritter Ordnung aufweist. magnified image
The previously described picture, for the lattice parameter behaviour of three site intermetallics in the L21 phase, is now applied to the C1b compounds. It is argued that the observed data, for several sequences of C1b compounds, can again be qualitatively understood in terms of the relevant d (or p) site occupation…
By a combination of experimental data [from the Ni (111) (2\ifmmode\times\else\texttimes\fi{}2)-K structure], model calculations, and simple formal theory, it shown that a strong initial-state effect exists in backscattering photoelectron diffraction, which can be ascribed to the parity of the emitted photoelectron so…
We report on systematic measurements of the viscosity of concentrated colloidal silica suspensions as a function of the volume fraction of particles and of the ionic strength. The experimental results are rescaled on a universal curve using a direct renormalization procedure which is described; the scaling ratios are…
The title compound, Na 6 H 3 [SmW 10 O 36 ].28H 2 O, coexists of a decatungstosamarate anion, six fivefold- or sixfold-coordinated Na + cation and water molecules of crystallization. The decatungstosamarate anion is comprised of two [W 5 O 18 ] 6- moieties chelating to a central Sm 3+ cation, which has tetragonal anti…
The conversion between polarization states upon reflection on the weakly corrugated interface between uniaxial crystals and isotropic media is studied by means of a model based on the Rayleigh hypothesis. We deal with sinusoidal gratings with the wave vector of the incident light being perpendicular to the grating gro…
Optical properties of Ge-Se-Te chalcogenide glasses for CO2 laser light transmission are investigated. It is found that the Te content of more than about 60 mol % is essential in reducing fundamental absorption caused by lattice vibration at 10.6 μm (CO2 laser light wavelength). It is also found that the Se content ab…
A generalized mathematical description of thermally stimulated luminescence (TL) and thermally stimulated conductivity (TSC) is presented in terms of a formulation that replaces the quasiequilibrium (QE) and kinetic-order approximations by two new functions Q(T) and P(T), respectively. These functions are related and…
The ultraviolet photodissociation and photodesorption of CD3I adsorbed on the TiO2(110) surface at ∼100 K has been investigated at 257, 275, 302, and 351 nm using modulated continuous-wave laser irradiation followed by resonantly enhanced multiphoton ionization of fragments expelled from the adsorbate layer. Photodiss…
We study the nematic-smetic A phase transition of binary mixture of parallel hard cylinders of different lengths. We use the Helmholtz free energy truncated at the second virial term. Changing values of q (length of a longer cylinder), x (composition) and η (packing fraction) of the cylinders, we obtained the transiti…
The structures of the title compounds, iron lutetium zinc oxides, can be described as a close packing of O atoms, with Lu atoms in octahedral voids and Fe and Zn atoms in tetrahedral voids. Blocks constituting m + 1 layers of Fe and/or Zn atoms along the c axis are alternately stacked with single layers of Lu along th…
Diamond (100) and (111) surfaces have been exposed to beams of atomic and molecular fluorine and chlorine in an ultrahigh-vacuum environment. X-ray photoelectron spectroscopy, low-energy electron diffraction, and thermal desorption techniques have been used to elucidate the chemistry involved. F atoms add to both the…
Nonhydrogenated diamondlike carbon films have been prepared by dual ion beam sputtering and ion-beam-assisted magnetron. The assistance parameters—ion energy, ion mass, ion flux/atom flux—have been systematically varied, and the films have been characterized by Rutherford backscattering spectroscopy, high-resolution t…
A model for a layered electron system is developed in which the electrons are treated completely quantum mechanically. In this model the ionic cores are replaced by parallel sheets of uniform positive charge. These charged sheets provide the neutralizing charge and the external potential which confines the interacting…
The title compound consists of the bulky 2,6-di-tert-butylphenoxy group and two phosphazene rings joined by a P-P bond [2.193 (2) angstrom]. The bulky group plays a predominant role in the distortion of the molecule as a whole. This distortion results in deviations of the benzene and phosphazene rings from planarity a…
We have succeeded in preparing RFe10.5V1.5 compounds and their corresponding nitrides RFe10.5V1.5Nx, where R=Y, Ce, Nd, Sm, Gd, Td, Dy, Ho, and Er. The structural and magnetic properties of RFe10.5V1.5Nx have been investigated by x-ray diffraction techniques and magnetic measurements and compared with those of RFe10.5…
A universal relationship between roughness and toughness of fractures is proposed and a new criterion to define brittle and ductile fracture is derived from the Griffith energy balance concept and fractal geometry.
From electrical resistivity and Hall coefficient measurements below 3 K on slightly reduced, semiconductive rutile single crystals with oxygen deficiencies ${\mathit{O}}_{\mathit{d}}$ between 3.7\ifmmode\times\else\texttimes\fi{}${10}^{18}$/${\mathrm{cm}}^{3}$ and 5.5\ifmmode\times\else\texttimes\fi{}${10}^{19}$/${\ma…
We report a systematic study of the resistivity and magnetic susceptibility of pure ${\mathrm{V}}_{2}$${\mathrm{O}}_{3}$, the original Mott-Hubbard system at half filling, for pressures 0\ensuremath{\le}P\ensuremath{\le}25 kbar and temperatures 0.35\ensuremath{\le}T\ensuremath{\le}300 K. We also study (${\mathrm{V}}_{…