Materials Literature
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In this research the process of formation of a low energy clinker is studied, when fly-ashes (rich in sulphates and lime) and fluorspar are used as raw materials (fly-ashes replaces to the tradicional raw mix partially). The availability of those fly-ashes is shown since clinker at 1.340 °C is obtained. The mineralogi…
A 75,000-dalton protein has been purified approximately 1,000-fold from rat liver, based on its capacity to organize poly(A) in a 27-residue repeating structure. This protein may be identified with the major polypeptide component of cytoplasmic poly(A)-ribonucleoprotein (RNP) previously described. The poly(A)-organizi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCesium and rubidium ion equilibriums in illite clayE. Brouwer, B. Baeyens, A. Maes, and A. CremersCite this: J. Phys. Chem. 1983, 87, 7, 1213–1219Publication Date (Print):March 1, 1983Publication History Published online1 May 2002Published inissue 1 March 1983https://pubs.ac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTActivation of carbon dioxide with aluminum porphyrin and reaction with epoxide. Studies on (tetraphenylporphinato)aluminum alkoxide having a long oxyalkylene chain as the alkoxide groupTakuzo Aida and Shohei InoueCite this: J. Am. Chem. Soc. 1983, 105, 5, 1304–1309Publicatio…
Superlattice spots observed by X-ray and electron diffraction in the tetragonal, metallic, quasi-one-dimensional compounds NbTe 4 and TaTe 4 are interpreted in terms of charge-density waves. It is shown that three slightly different types of columns occur in the crystals. In NbTe 4 at room temperature two types of cha…
Bei der Reaktion von Fe3(CO)12 mit den Dithiolen (II) im Molverhältnis 1:1 entstehen die zweikernigen Komplexe (III), von denen einige bereits mit wesentlich geringerer Ausb. dargestellt wurden.
We present a theory of the dielectric permittivity in which the intermolecular dipole-dipole correlations are treated explicitly. The results for the static permittivity agree with those which have previously been obtained by continuum calculations. The frequency dependence of the permittivity is related to two relaxa…
The shear elastic modulus C44 of graphite has been determined by Brillouin scattering from surface waves. The author's value agrees with that obtained from neutron scattering experiments but differs from those determined by ultrasonic technique.
Cathodoluminescence in the 1.40 eV and 2.56 eV systems is observed from most nitrogen-containing synthetic diamonds. The authors show that there is a tendency for the 2.56 eV luminescence to be strong when the 1.4 eV luminescence is strong, and that both are strongest for diamonds grown in the presence of nickel. Abso…
Thermoluminescence measurements of 80 K X-irradiated MgO and MgO:Li single crystals are performed. In pure MgO four glow peaks, observed at 175, 220, 245, and 265 K, are associated with the release of holes from different traps. All these glow peaks show two emission bands at 375 and 700 nm (the latter due to Cr3+ ion…
Space-charge-limited (SCL) currents in materials with quasicontinuous energy distribution of localized states are discussed. A simple analytical method is developed enabling to extract quantitative information about an arbitrary energetic distribution of localized states from a single experimental SCL current-voltage…
In continuation of the investigations of the electrical and thermal conductivity as well as the magneto resistance in the binary system titanium-oxygen for TiOx with metallic conductivity for x < 1.49 the corresponding properties for the semiconductive compounds with 1.49 < x < 2 are measured at low temperatures and m…
Resistivity, Hall-effect, and space-charge---limited---current (SCLC) measurements were performed on InSe single crystals grown by the Bridgman-Stockbarger method. The electrical properties of the investigated samples are dominated by two donor centers at 0.10 and 0.34 eV. The latter donor influences the SCLC at room…
For glassy materials relaxation as a function of time is generally well fitted with the Williams–Watts function exp[−(t/τ0)β] with β≊1/3. One frequently interprets such nonexponential behavior in terms of a superposition of exponential relaxation processes with density ρβ(τ). We have determined ρβ(τ), corresponding to…
A range of high purity type III synthetic silicas (Suprasil 1, Spectrosil, Dynasil 1000) has been subjected to 100 keV X irradiation at 77 K and the induced ESR spectra have been recorded at 100 K before and after successive pulse anneals to higher temperatures. Absolute spin concentrations are determined as functions…
We report photoemission spectra and intensity profiles of the $3d$ emission and the resonant valence-band satellites in NiO and Ni. Ni in Ni metal is in a $3{d}^{9}$ configuration, but Ni in NiO is in a $3{d}^{8}$ configuration. NiO gives an opportunity to study the effect of a larger number of holes in the $d$ config…
$k$-resolved inverse photoemission spectra taken on Ni(001) and Cu(001) show a weak peak at an apparent energy within a bulk band gap and close to the vacuum level. Comparisons with the energy-loss function $|\mathrm{Im}(\frac{1}{\ensuremath{\epsilon}})|$ show that it may be due to an energy-loss satellite. Surface st…
Complete dielectric isolation of silicon regions 45 μm wide for microcircuits on silicon substrates is demonstrated by selective formation of oxidized porous silicon in heavily doped n-type regions. Anodic etching of n-type silicon in a hydrofluoric acid electrolyte exhibits a concentration-dependent voltage threshold…
A three-step design procedure is developed for dielectric stacks which are required to be nonpolarizing for a given wavelength lambdar and angle of incidence theta 0,r, at which the reflectance Rr is prescribed. The method leads to solutions in which only three layer materials occur and can be applied for a wide range…
We present a general thermodynamic model of the bound magnetic polaron which takes into account the f$\stackrel{\mathrm{\ifmmode \dot{}\else \.{}\fi{}}}{\mathrm{r}}$ee energies of the localized spins, of the free carriers, of the electrons localized in the bound magnetic polarons, and of the electrons trapped on impur…