Materials Literature
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Using the transient hot-wire method, thermal conductivity and heat capacity per unit volume are measured for solid and liquid phases and glassy crystal states of cyclooctanol, and information is provided on the phase diagram under high pressure. A new solid phase (III) is detected and characterized as a normal crystal…
The data are obtained of the electrical activity of Fe, Ni, Mn, Cu, Te, Re, W in β-boron. These dopants are shown to be donors or acceptors depending on their disposition in nonequivalent voids of the lattice. Some information on the conduction mechanism and on the density of localized states in doped β-boron is also…
Thin film capacitors of AlNd2O3Al structure are fabricated by the resistive heating method under a vacuum of 2.66 × 10−3 Pa. The thicknesses of the dielectric films are measured by a multiple beam interferometer. Aging, annealing, and dielectric properties are studied in the frequency range 1 to 30 kHz at various te…
The plasmon excitation spectrum for a multiple-quantum-well superlattice with rectangular defect barriers in each quantum well is calculated in the random-phase approximation. It is demonstrated that both the intersubband and the intrasubband plasma frequencies can be effectively tuned subject to variations of the par…
The phonon-drag thermoelectric power ${\mathit{S}}_{\mathit{g}}$ in ${\mathrm{Al}}_{\mathit{x}}$${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$As/GaAs heterojunctions at low temperatures (\ensuremath{\lesssim}5 K) is theoretically investigated based on the Cantrell-Butcher theory. The experimental data are well e…
Cs + 2(C 10 H 20 O 5 )•K − (I) cristallise dans C2/m avec a=11,537, b=13,679, c=10,624 A, β=90,12 o , Z=2, affinement jusqu'a R=0,067. Rb + 2(C 10 H 20 O 5 ); Rb − cristallise dans C2/m avec a=11,635, b=13,855, c=10,556 A, β=88,82 o , Z=2, affinement jusqu'a R=0,053. Les deux composes sont isostructuraux avec Rb + (15…
Highly conductive polypyrrole complexes obtained from chemical polymerization and oxidation of pyrrole by ${\mathrm{FeCl}}_{3}$ were studied by x-ray photoelectron spectroscopy. Properly deconvoluted Cl 2p core-level spectra of the complexes suggest that the chlorine dopant can exist in three chemical states. Thus rea…
A new liquid-crystalline phase has been discovered in a broad temperature region between the cholesteric and smectic-A phases for the mixture of cholesterylnonanoate and nonyloxybenzoic acid. This phase is a helical smectic A with local smectic ordering, helical macrostructure, significant rigidity in shear deformatio…
The adsorption of triethylgallium on the GaAs (100) (4×1) surface has been studied using the techniques of low energy electron diffraction, x-ray photoelectron and Auger spectroscopies, high resolution electron energy loss spectroscopy and temperature-programmed desorption. Condensed multilayers of the organometallic…
Electronic-structure calculations using the ab initio generalized-valence-bond approach have been used to investigate the structure and bonding of silicon clusters ${\mathrm{Si}}_{3}$--${\mathrm{Si}}_{10}$. While several previous studies of the structures of these clusters have been presented, this is the first to pro…
Optical phase conjungation using an amorphous silicon/ferroelectric-liquid-crystal light modulator shows an optical response of 100 microsec with a diffraction efficiency of 8.5% for an incident optical intensity of 1 mW/cm(2).
Azimuthal diffraction patterns of 1s and 2s photoelectrons, of plasmon-loss peaks and inelastic-background intensities, as well as of medium-energy electrons, are presented for polar angles of 45\ifmmode^\circ\else\textdegree\fi{} and 55\ifmmode^\circ\else\textdegree\fi{} off the surface normal of a clean Al(001) crys…
The notion of zitterbewegung and the resulting formalism, originally proposed for relativistic quantum dynamics, is applied to describe the acceleration of a nonrelativistic electron moving in a crystal, due to the periodic force experienced. A general linear-combination-of-atomic-orbitals (LCAO) approach is developed…
The electroreflectance spectra of the halogen-bridged mixed-valence Pt complexes, [Pt(ethylenediamine${)}_{2}$][Pt(ethylenediamine${)}_{2}$${\mathit{X}}_{2}$](${\mathrm{ClO}}_{4}$${)}_{4}$ (X=Cl, Br, and I), have been measured. Electric-field-induced new absorption bands that can be assigned to optically forbidden cha…
It is predicted that in a charge-density-wave (CDW) ring-shaped conductor, placed in an external vector-potential field, there should appear a new Aharonov-Bohm contribution to the magnetic susceptibility and the electrical conductivity oscillating as a function of the flux with the period ${\mathrm{\ensuremath{\Phi}}…
Transparent conductive tin dioxide thin films were prepared by a low-temperature atmospheric-pressure chemical vapor deposition method in air. The raw material was tin(II) trifluoroacetate. At a reaction temperature above 250 °C, polycrystalline thin films were obtained with a high deposition rate. This chemical vapor…
We have studied the electronic structure of MnO by photoemission spectroscopy. Mn 3d--derived emission is found to be confined within \ensuremath{\sim}10 eV of the top of the valence band, and we find no evidence for an intrinsic satellite at higher binding energies. The photoemission intensity of the whole valence ba…
Continuum acoustics allows only three different phonons to be reflected and transmitted for each phonon that is incident on an interface between two materials. We show that a lattice-dynamical theory for dissimilar lattices allows more phonons to be generated at the interface since we must introduce a larger unit cell…
A new Brownian motion simulation technique developed by Torquato and Kim [Appl. Phys. Lett. 55, 1847 (1989)] is applied and further developed to compute ‘‘exactly’’ the effective conductivity σe of n-phase heterogeneous media having phase conductivities σ1, σ2, ..., σn and volume fractions φ1, φ2, ..., φn. The appropr…
The buildup of the internal bias in time and the decrease of the internal bias by forced switching of the polarization by an ac field have been described empirically by various authors. Both time dependencies can now be derived from a simple model, proposed recently by G. Arlt and H. Neumann [Ferroelectrics 87, 109 (1…