Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron spectroscopy of alkylaminesilanes bound to metal oxide electrodesP. R. Moses, Larry M. Wier, John C. Lennox, H. O. Finklea, J. R. Lenhard, and Royce W. MurrayCite this: Anal. Chem. 1978, 50, 4, 576–585Publication Date (Print):April 1, 1978Publication Hist…
In device-manufacturing technology, it is important to understand why dielectric films crack. With this objective in mind, we have constructed an apparatus for measurement of thermal stresses in thin films (25–500 °C), obtained results on various reactively plasma deposited (RPD) Si-N and CVD SiO2 films, and developed…
Abstract The core levels of a series of 83 homopolymers have been studied by electron spectroscopy for chemical analysis (ESCA). Comparisons of the experimentally determined core‐level binding energies with theoretical calculations using the ground‐state potential model in the complete neglect of differential overlap…
Abstract A stable porous system consisting of montmorillonite cross-linked by Al-hydroxide oligomers was synthesized by reacting at room temperature an aqueous solution of such oligomers with a unit-layer dispersion of montmorillonite. The resulting cross-linked montmorillonite (Al-CLM) is a nonswelling material, show…
Cell suspensions of Bacteroides fragilis were allowed to ferment glucose and lactate labeled with (14)C in different positions. The fermentation products, propionate and acetate, were isolated, and the distribution of radioactivity was determined. An analysis of key enzymes of possible pathways was also made. The resu…
Many crystals may be regarded as made of layer modules that are chemically distinct and that in different crystals may occur in different pioportions, giving rise to polysomatic series. The humites constitute a classic example, as do certain phyllosilicates and hydroxides. Amphiboles, in particular,_ may be factored b…
This paper surveys the characteristics of threshold switching systems and examines the evidence for threshold switching as an electronic process. A semiquantitative model is proposed for the nature of the ON---state. The OFF---ON transition is also discussed in the light of recent experimentation, as are the principal…
The hydrogen content of glow-discharge-deposited silicon nitride (SiN) films made at 330–350 °C has been determined. Preparation conditions were varied to produce a range of compositions of Si/N=0.7–1.4. Quantitative hydrogen profiling of the samples was carried out using the resonant nuclear reaction 15N+H→12C+4He+γ…
Existing knowledge about Scherrer constants is reviewed and a summary is given of the interpretation of the broadening arising from small crystallites. Early work involving the half-width as a measure of breadth has been completed and Scherrer constants of simple regular shapes have been determined for all low-angle r…
A new technology of the formation of high-temperature non-metallic crystals, glasses, and fused ceramic materials is described. It is based on the method of direct induction fusion in a cold container. An account is given of the physical foundations of the technology and the technological apparatus is described. The p…
Without application of an external electric field, the temperature dependence of the shear angle u xy , which is proportional to the spontaneous polarisation and therefore to the order parameter, has been measured by means of Bragg scattering of 412 keV gamma -radiation in KH 2 PO 4 and RbH 2 PO 4 . Simultaneously, op…
Abstract Das Porphin (Ia), das nach bekannter Methode unter Verwendung von p‐Dimethylaminobenzaldehyd erhalten wurde, reagiert mit Methyliodid in DMF unter Rückfluß zu dem Titelporphyrin (Ib) als Iodid, ‐das spektrophotometrisch untersucht wurde.
The dispersion relations for molecular-orientation fluctuations in a freely suspended ferroelectric smectic-$C$ liquid-crystal film have been determined by inelastic light scattering. The smectic-$C$ film geometry appears to be ideal for the experimental study of the space-time behavior of a two-dimensional orientatio…
Useful theories and models of the color and constitution of unsaturated organic compounds have been sought for more than a century. The promises of quantum chemistry have not yet been realized satisfactorily. The polymethine concept, a modern chemical theory of constitution, is an auspicious development.
The thermal dissociation rate of NF3 in mixtures of 5% and 10% NF3 in Ar has been measured behind incident shock waves over the temperature range 1330–2000 K. Dissociation rates were determined from postshock density gradients measured by laser beam deflection. The second order rate coefficient determined for NF3–Ar c…
Luminescence bands due to Cu + ions are found at 2.77 eV and 3.13 eV in CdBr 2 and at 1.75 eV, 2.85 eV and 3.30 eV in CdCl 2 . Thermal characteristics of these bands are analysed by rate equations. Optical extinction bands due to copper colloid are found at 1.90 eV and 2.10 eV in CdBr 2 and CdCl 2 , respectively. Exis…
A method is presented of solving for the vibrational Green's function of a silicon-dioxide Bethe lattice when it contains second-nearest-neighbor interactions. The method is used to find the density of states of a Bethe lattice constructed with a Keating Hamiltonian. The primary effect of the second-nearest-neighbor i…
The effect oj Cu Oil the hydrogell illduced cracking oj the pipe line steel was studied electrochemically and metallographically ill detail.It was Jound out that, if the addition oj Cu was more than 0.2 % , hydrogen illduced crackillg could be effectively suppressed.This is because addition oj Cu enhances the Jormatio…
Phonon spectra of organic linear conductors in the Peierls (semiconducting)phase are considered. It is shown that infrared absorption and Raman scattering can give information on the electron-phonon couplings of the various phonons. A rather sharp structure is predicted also above the electronic gap which is due to in…
The results of a set of experiments designed to delineate the nucleation rate, supersaturation, temperature surface for the system CaSO 4 •2H 2 O/H 2 O are reported. The data were obtained using the droplet technique coupled with in situ generation of SO 4 2− under the conditions that dS/dt was large during the early…