Materials Literature
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Conductivity measurements of ${\mathrm{PbCl}}_{2}$ and ${\mathrm{PbBr}}_{2}$ under pressure have been carried out by Oberschmidt and Lazarus. The migration and activation volumes scale with the corresponding enthalpies in a manner predetermined by the bulk properties. By considering the existing data for a large varie…
The effect of a nonuniformly emitting cathode on a space-charge-limited diode is analyzed. The first part of the analysis is a calculation of the extent to which inhomogeneities in the space charge are reduced by the motion of electrons in directions parallel to the cathode surface. It was found that, in typical cases…
Pyroelectricity of magnetite along the triclinic a , b and c axes was measured over the temperature range from 4.2 K to 20 K. It was found that the pyroelectricity along the triclinic a axis begins to decrease at 6 K, as the temperature is increased, while the one along the b and c axes begins to increase at the same…
We have found the charge-density wave (CDW) in (${\mathrm{TaSe}}_{4}$${)}_{2}$I to display a low-frequency dielectric relaxation characterized by a distribution of relaxation times. The mean relaxation times vary between approximately ${10}^{\mathrm{\ensuremath{-}}4}$ and ${10}^{\mathrm{\ensuremath{-}}8}$ sec in the t…
Tight-binding theory, as applied to tetrahedral semiconductors by Harrison, has been extended to crystal structures of more general coordination. Following Harrison's application to ${\mathrm{SiO}}_{2}$, the total energy is formulated in terms of multicenter bonding units, the analog of the two-center bond in tetrahed…
We have observed a new memory effect related to metastable states of a moving charge-density wave (CDW) in ${\mathrm{K}}_{0.30}$${\mathrm{MoO}}_{3}$. At 45 K we find that the transient oscillations seen in the leading edge of current or voltage pulses are influenced by the duration of the preceding pulse. For repetiti…
The measurements of the extended X-ray absorption fine structure and the photoacoustic spectroscopy have been carried out for Se chains confined in the channels of synthetic mordenite with about 6.7 A diameter. The first-nearest Se–Se distance in mordenite channels is 2.32 A, shorter than that in crystalline Se. The a…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text I. Ladany, P. J. Zanzucchi, J. T. Andrews, J. Kane, and E. DePiano, "Scandium oxide antireflection coatings for superluminescent LEDs," Appl. Opt. 25,…
Magnetization of Fe 3 Ga 4 is measured as a function of magnetic field and temperature. In weak fields, Fe 3 Ga 4 is an antiferromagnetic with a Néel temperature of 392 K. In strong fields, it shows a metamagnetic transition and gives a saturation moment of 1.27 µ B per Fe atom at 4.2 K and 70 kOe. Its Mössbauer spect…
Mechanisms of interdiffusion in copper/nickel thin-film couples have been investigated in the temperature interval 573–777 K by in situ measurement of contact resistance, Auger depth profiling (ADP), and transmission electron microscopy. Correlation between evolution of contact resistance and measured Auger concentrat…
Calculated optical absorption spectra of colloidal copper particles in photochromic glasses containing both copper halides and cadmium halides are presented. Comparison with available experimental data supports the previously suggested colloidal darkening mechanism. The dielectric constant of the copper particles is o…
Incorporating the thermal fluctuations of the phase of charge-density-wave order parameter into the theory, we extend the Fukuyama-Lee-Rice theory to finite temperatures. We find the temperature dependence of the threshold field at low temperatures (e.g., T(1/2)${T}_{c}$) is given by , where ${T}_{0}$ is a material co…
The tight-binding electronic structure of two-dimensional quasicrystals is studied numerically for three patterns of Penrose tiling with up to 426 vertices. According to the range of interactions, three different models are considered. For the simplest model, two different interactions are assigned to long and short e…
Temperature- (T) and frequency- (\ensuremath{\nu}) dependent dielectric losses on ${\mathrm{Rb}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$(${\mathrm{NH}}_{4}$${)}_{\mathrm{x}}$${\mathrm{H}}_{2}$PO $_{4}$ single crystals (RADP), and their deuterated isomorphs (D-RADP), can be collapsed to single curves with a scaling varia…
The absorption coefficient and index of refraction have been measured in the 2–30-cm−1 frequency range for the following materials at a temperature near 5 K: Pyrex, Fluorogold, Eccosorb CR110, Stycast 2850 FT, Plexiglas, TPX, Neoprene, Teflon, and Nylon. For some of these materials room temperature measurements were a…
The spectral dependence of the photoionization energy of Eu2+:CaF2, Ce3+:YAG, and Sm2+:CaF2 systems have been measured and thresholds experimentally determined and compared with theoretical values calculated from electrostatic models. It is shown that the excited state absorption transitions or the persistent hole bur…
Grady’s model of the dynamic fragmentation process, in which the average fragment size is determined by balancing the local kinetic energy and the surface energy, is modified to include the stored elastic (strain) energy. The revised model predicts that the strain energy should dominate for brittle materials, with low…
This paper reviews applications of cathodoluminescence scanning electron microscopy in the assessment of optical and electronic properties of semiconductors. The assessment includes, for example, information on band structure and impurity levels derived from spectroscopic cathodoluminescence, analysis of dopant concen…
A simple aberration theory is described for systems containing tilted and decentered surfaces. Design principles are developed and applied to two and three mirror systems.
The electronic behaviour of Pt, Rh and Ni/TiO 2 catalysts was followed by measuring in situ the conductivity σ of the support. From σ variations at room T, it is deduced that the metal is always enriched in free electrons from the support and that H 2 chemisorption is followed by H spill over on the oxide. On Pt/TiO 2…