Materials Literature
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Thin films of amorphous P, prepared by rf sputter deposition under conditions of variable substrate temperature, have been studied using x-ray diffraction and Raman scattering methods. The low-angle x-ray spectra indicate a peak at $k\ensuremath{\simeq}1.1$ ${\mathrm{\AA{}}}^{\ensuremath{-}1}$, whose half-width and re…
A large red shift in the energy of the plasmon resonance in metallic V${\mathrm{O}}_{2}$ has been observed by decreasing the temperature near the metal-to-insulator phase transition (${T}_{c}=68$\ifmmode^\circ\else\textdegree\fi{}C). Below the transition temperature the plasmon resonance disappears. The plasmon resona…
Optical absorption and luminescence investigations performed on the system KCl-Eu${\mathrm{Cl}}_{2}$ revealed that, in addition to the precipitated phase which nucleates at temperatures below 100\ifmmode^\circ\else\textdegree\fi{}C and which has been ascribed to the Suzuki phase, three other Eu-precipitated phases can…
A single model is developed for the different photoelastic response of Ge-family materials and chalcogen-based molecular solids. If ${\ensuremath{\chi}}^{\ensuremath{'}}$ is the "Gr\"uneisen" parameter for the electronic susceptibility, experiment shows that ${\ensuremath{\chi}}^{\ensuremath{'}}<0$ for the former g…
The static structural properties of Al are calculated using the self-consistent pseudopotential approach with local-density-functional expressions for the exchange and correlation energies. The only input parameter is the atomic number. Calculated values for the lattice constant, bulk modulus, and cohesive energy agre…
Angle-resolved ultraviolet photoelectron spectroscopy has been used to determine the initial-state energy versus ${\stackrel{\ensuremath{\rightarrow}}{\mathrm{k}}}_{\ensuremath{\parallel}}$ dispersion of surface states on the Si(100) (2\ifmmode\times\else\texttimes\fi{}1), two-domain, reconstructed surface. One surfac…
The principle of corresponding states has been applied to the viscosity of alkali halide single salts and their binary mixtures. The scaling parameters obtained from the reduced Tosi–Fumi potential were put to use for the reduction of the viscosity values. An empirical universal relationship of η−1∝V⋅T1/2 among the re…
We report self-consistent Green's-function calculations of two defects in diamond. The unrelaxed neutral vacancy and unrelaxed substitutional nitrogen are compared. The vacancy shows a partially empty ${T}_{2}$ state at 1.53 eV above the valence edge which should in analogy to silicon drive a Jahn-Teller distortion. S…
We have performed a stability analysis for the Jackson-Hunt model of a directionally solidifying, thin-film, lamellar eutectic. Allowed perturbations include displacements of the solid-solid-liquid triple points in directions both parallel and perpendicular to the direction of growth. These displacements are coupled i…
An organic color sensor was fabricated by using p- and n-type dyes. The cell has a layered structure of Zn0/merocyanine/rhodamine B, which acts as an n-p-n- photodiode. The spectral sensitivity of the cell was changed remarkably by bias voltage, and a good separation of the spectral responses was obtained in the visib…
The two-photon fluorescence intensity from Rhodamine $B$ molecules adsorbed onto silver particle films is enhanced 150-fold compared with molecules in solution. This is accounted for in terms of local-field amplification of the incident intensity when the absorbing state of the molecules lies within the plasma resonan…
$^{29}\mathrm{Si}$ hyperfine structure determinations for two fundamental oxygen-associated paramagnetic defect centers in high-purity amorphous silica complete the characterization of the nonbridging oxygen hole center and the peroxy radical by demonstrating in each case that the oxygen(s) trapping the unpaired spin…
Highly conductive films of zinc oxide have been prepared by reactive rf magnetron sputtering from an oxide target. Film conductivities ranging from ∼10−8 Ω−1 cm−1 to 5×102 Ω−1 cm−1 can be obtained depending on the sputter conditions. Films with sheet resistivities of 85 Ω/⧠ showed little absorption and ∼90% transmissi…
Loss minima in two fluoride glass and chalcogenide glass fibres were calculated. The intrinsic losses are predicted to be 1 × 10−3 dB/km at 3.4 μm for BaF2-GdF3-ZrF4 glass fibre, 1 × 10−2 dB/km at 2.7 μm for BaF2-CaF2-YF3-AlF3 glass fibre and 1 × 10−2 dB/km at 4.5 μm for GeS3 glass fibre.
The quenching of the luminescence of molecules adsorbed at a smooth Ag surface is offset by the enhancement of the incident and emitted em fields when they are adsorbed at a Ag island film. The observed spectra which exhibit hot and relaxed luminescence components are analyzed in terms of the relevant electronic proce…
Measurements of the coefficient of linear thermal expansion of pure polycrystalline silicon were made with a polarization interferometer and a platinum resistance thermometer with an estimated error of less than 0.01 × 10 -6 K -1 .
The relative magnitudes of the Raman scattering tensor elements have been measured as a function of temperature for each of the three internal modes of nitrite in sodium nitrite. General valence force fields were calculated and the resulting eigenvectors served as a basis for Raman intensity calculations in the orient…
Transport and Raman data are presented for samples of Ti 1+x S 2 with carrier densities, determined from the Hall coefficient, ranging from approximately 10 20 cm -3 to approximately 3*10 21 cm -3 . No dependence on carrier concentration, n, is observed for the frequency of the A 1g Raman-active phonon, whereas a stro…
Phase transition in squaric acid is discussed on the basis of pseudo-spin model for the hydrogen bond system. A strong coupling between the lattice distortion and proton system is introduced in order to account for the twin structure and improper ferroelastic behaviour in the low temperature phase. Anomalous elastic c…
The oxidation-reduction properties of mixed oxides in the system Sm-U-O and the variation of their lattice parameters due to oxidation and reduction were examined by means of thermogravimetry and X-ray diffraction. For mixed oxides SmyU1-yO2±x prepared in air, the O/M ratio decreased linearly from 2.667 at y= 0 to nea…