Materials Literature
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The dc conductivity of a-Se and binary amorphous SeTe, SeGe, and SeSb films is measured as a function of temperature (80 to 300 K) and film thickness (500 to 2000 Å). It is found that except for SeSb films, the conduction in all the samples takes place in the tails of localized states via thermally activated tunne…
The thermal conductivity of Ge doped with electroneutral impurities, Si, Sn and the acceptor impurity, Al, is investigated in the temperature range 80 to 400 K. It is established that at equal impurity concentrations the temperature dependence of the thermal conductivity in Ge doped with the electroactive impurity Al,…
The dislocation dynamics in MgO single crystals containing some hundred ppm of aliovalant impurities is investigated by three experimental techniques: in-situ deformation experiments in the high-voltage electron microscope, stress pulse-etching experiments on individual dislocations, and macroscopic deformation experi…
The thermoelectric properties of polycrystalline samples of GeTe-rich side solid solutions (GeTe)1−x·(AgSbTe2)x, for the compositions x = 0.00, 0.10, 0.15, 0.20, and 0.29 are investigated. The temperature dependences of the Seebeck coefficient and the electrical resistivity and the dependences of the total thermal con…
An optical method of measuring and displaying depth information has been developed which is based on the Fresnel diffraction properties of coherently illuminated gratings. Cosine modulated gratings are found to be more flexible than simple gratings for depth measurement. A pair of gratings crossed at right angles is u…
The Raman spectrum of solid silicon at the melting temperature has been obtained. A silicon film on a quartz substrate was radiantly heated with the use of 10.6-\ensuremath{\mu}m radiation from a C${\mathrm{O}}_{2}$ laser while the Raman scattering was excited by a pulsed Ar-ion laser. The results indicate that the si…
We present a new multiplet theory that separates mean-field from multiplet effects in the excitation and donor-acceptor ionization spectra of localized impurities. Analysis of the experimental data for all $3d$ impurities in ZnO, ZnS, ZnSe, and GaP for which sufficient data exist and for the bulk Mott insulators CoO,…
We report results of photoemission experiments and a new bulk band-structure calculation for monotungsten carbide (WC). Three types of photoemission experiment were performed on a WC(0001) surface, with the use of synchrotron radiation. Normal-emission angle-resolved spectra in the range $10\ensuremath{\le}h\ensuremat…
The measurements of the $c$-axis conductivity ${\ensuremath{\sigma}}_{c}$ at room temperature for acceptor graphite intercalation compounds typically show very small values of ${\ensuremath{\sigma}}_{c}$, ranging from \ensuremath{\sim}${10}^{\ensuremath{-}1}$ to \ensuremath{\sim}10 ${(\mathrm{\ensuremath{\Omega}}\math…
The Raman spectrum of the defect tetrahedral layer compound GaGeTe at 297 and 80 K has been measured. Six prominent phonons, at 296, 286, 263, 178, 168, and 66 ${\mathrm{cm}}^{\ensuremath{-}1}$, have been observed at 297 K. These phonons are compared with theoretical predictions based on the planar force constants of…
The optical constants $n$ and $k$ of arc-evaporated amorphous carbon films between 400 and 4800 ${\mathrm{cm}}^{\ensuremath{-}1}$ were determined by measuring the transmittance and the reflectance of the films. Two broad bands with maxima at 703 and 1233 ${\mathrm{cm}}^{\ensuremath{-}1}$ in the spectral dependence of…
Vacancy jumps in a bicrystal model of $\ensuremath{\Sigma}=5$ (36.9\ifmmode^\circ\else\textdegree\fi{}) [001] tilt boundary in bcc Fe have been simulated at temperatures of 1300, 1400, and 1500 K by molecular dynamics with the use of the empirical Johnson potential. The results confirm the dominance of a vacancy mecha…
Raman spectra are reported for liquids and Langmuir films enhanced by the electromagnetic fields of plasmon surface polaritons at flat silver surfaces. The Kretschmann prism coupling configuration is used to excite the incident surface polariton and to couple out the Raman shifted surface wave. The spectra are interpr…
The structural relaxation of a high-angle grain boundary at elevated temperatures has been simulated by molecular dynamics with the use of a bicrystal model composed of 399 atoms. The system studied was a $\ensuremath{\Sigma}=5$ (36.9\ifmmode^\circ\else\textdegree\fi{}), [001] tilt boundary with interatomic interactio…
We have measured the change in the charge-density-wave (CDW) transitions in monoclinic Nb${\mathrm{Se}}_{3}$ and orthorhombic Ta${\mathrm{S}}_{3}$ caused by stress applied along the high-symmetry (growth) axis. For the upper transition in Nb${\mathrm{Se}}_{3}$, $\frac{d{T}_{1}}{d\ensuremath{\sigma}}=\ensuremath{-}4.4$…
MgO crystals which contain dissolved traces of ${\mathrm{H}}_{2}$O eventually acquire an excess oxygen content, $\mathrm{Mg}{\mathrm{O}}_{1+\ensuremath{\delta}}$, because O${\mathrm{H}}^{\ensuremath{-}}$ pairs, associated with cation vacancies, convert in part into molecular ${\mathrm{H}}_{2}$ and peroxy anions, ${\ma…
An attempt has been made to distinguish space charge and dipolar polarisation in Kapton-H polymer thin film. The conclusions drawn on the basis of thermally stimulated discharge current (TSDC) investigations are further confirmed by thermally stimulated polarisation current (TSPC) studies. The other techniques adopted…
X-ray and high-resolution uv photoemission spectroscopy of the conduction band of Am metal directly reveal that the $5f$ electrons in Am are localized, in contrast to the $5f$ electrons in the lighter actinide metals. The observed $5f$ final-state multiplet structure arises from a trivalent $5{f}^{6}$ Am ground state.…
We argue that the widely held view that MnO, FeO, CoO, and NiO are Mott insulators is incorrect. Intra-atomic potential energies do not dominate interatomic kinetic energies, to the extent commonly believed; both are 1-2 eV in magnitude. A measure of the importance of interatomic effects is our finding that both the c…
A Monte Carlo calculation for light intensities scattered from a random Gaussian-correlated surface is presented for the first time. It is shown that small randomness on a grating surface can considerably change the intensities and, in particular, the surface polariton resonances. These results should be used to check…