Materials Literature
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Visible light emission from Si+ implanted SiO2 layers as a function of different annealing conditions (temperature, time and ambient) is studied. It is shown that a 560 nm band, present in as implanted samples, increases its intensity for increasing annealing temperatures and is still observed after annealing at 1000…
First order reaction kinetics have been accurately fitted to birefringence data taken on polyvinylcinnamate samples during polarized UV exposure. The peak measured value of 0.0136 is about three times smaller than that found in rubbed polymers. However the measured azimuthal anchoring energy (4.2 × 10−6 J m−2) is abou…
The viscoelastic properties of gum rubbers and the properties of corresponding compounds are discussed. Representative examples are given to illustrate the important influence of gum rubber on the compound properties. A method for evaluating strain amplification and strain-rate amplification is proposed. Examples are…
Other| June 01, 1996 Mechanism of the SiO 4 for CO 3 substitution in defernite, Ca 6 (CO 3 ) (sub 1.58) (Si 2 O 7 ) (sub 0.21) (OH) 7 [Cl (sub 0.50) (OH) (sub 0.08) (H 2 O) (sub 0.42) ]; a single-crystal X-ray study at 100 K Thomas Armbruster; Thomas Armbruster Universitaet Bern, Laboratorium fuer chemische und minera…
Abstract Three way catalysts were dispersed over the surface of an anodized Ti wire in order to promptly eliminate hydrocarbons remained in cold-start-exhaust gas from an automobile engine. The anodized wire was heated up to 623 K or higher in 30 sec simply to loading 13 V to the ends of the wire, which resulted is ab…
The determination of thin film thickness by four X-ray reflectivity methods (namely, the peak separation, the Fourier transform, the modified Bragg equation, and the curve-fitting methods) has been studied. An analysis of SrS and BaF 2 thin films showed thickness values determined by the methods agreed to within 4%. T…
During sintering of Al 2 O 3 ‐10ZrO 2 ceramics, cracklike voids were formed due to the differential in densification between agglomerates and the matrix. The small external pressure (2 MPa) applied during presintering at 1200°C prevented the formation of these cracklike voids. The results are explained in relation to…
LethaiaVolume 29, Issue 2 p. 197-202 Comparison of the organic matrix of fossil and recent bivalve shells MICHAEL J. RISK, MICHAEL J. RISK Department of Geology, McMaster University, Hamilton, Ontario, Canada L8S 4M1Search for more papers by this authorBRIAN G. SAYER, BRIAN G. SAYER Department of Chemistry, McMaster U…
Thermoluminescence properties of Li2B4O7 polycrystalline powder undoped and doped with Cu or Eu impurities are investigated. Glow curves of ß irradiated samples are recorded and the dependences of their shapes and of the peak intensities on the dopant concentrations are determined. The results obtained for Li2B4O7:Cu…
Techniques of electron microscopy and specimen preparation of polymers for studying morphology and interfacial layers are briefly reviewed, including a discussion of general problems of electron microscopic investigations of polymers arising from irradiation sensitivity and low contrast. To improve contrast, some irra…
This experiment describes the synthesis of 1,4,8,11-tetraazacyclotetradecane and its nickel(II and III) complexes avoiding the use of percholrate anion. The paramagnetic effects in solution and solid state are described for the nickel(III) dihalo derivatives along with a spectrophotometric study.
Stress corrosion experiments were carried out on oriented single crystals of copper-gold and copper-zinc (α-brass) using constant and slow strain rate (SSR) loading modes under various chemical conditions in which passive oxides were present on the surface or dealloying occurred in the absence of such films. Results s…
Abstract A first-principles method for the computation of electric field gradients (EFG) is illustrated for various borides. It is based on energy band calculations using the full-potential linearized aug-mented plane wave (LAPW) method within density functional theory. From the self-consistent charge density distribu…
Internal photoemission is a photoelectric characterization technique commonly used to study semiconductor heterojunction characteristics. Previous analyses of internal photoemission including those of Fowler, Kane, and Powell have been well accepted and applied; however, the quantum effects were not fully taken into a…
A novel multipulse laser technique has been used to study the crystallization behavior of the GeTeSe ternary system, and the dependence of the nucleation and growth rates on composition has been related to the optical and structural properties. We show that the Se content is dominant in determining both the nucleation…
The anodic reaction on spectrally pure graphite (SPG) and pyrolytic graphite was studied in the potential range from 1.2 to 1.8 V vs. an aluminium reference electrode in alumina‐saturated cryolite melts at 1000°C by means of electrochemical impedance spectroscopy. It has been found that the total electrode reaction ca…
1,5-Dioxepane-2-one (DXO) was coordinatively ring-opening polymerized with different Lewis acids in bulk and solution. The reactivities of a series of initiators (SnCl4, FeCl3, AlCl3, BCl3, and BF3OEt2) at different temperatures and reaction times were analyzed. Polymerization of DXO in bulk with SnCl4, FeCl3, AlCl3,…
Real-space observations of gasification reaction of graphite surface caused by UV irradiation were made using scanning tunneling microscopy (STM). The formation of etch pits on highly oriented pyrolytic graphite (HOPG) surface during gasification reaction was investigated. At the beginning of gasification reaction, do…
Abstract Sedimentary zeolites clinoptilolite, mordenite and erionite occur as diagenetic products of ash falls of rhyolitic composition from the Oligocene Chichindaro Formation at the limits of the Mexican Volcanic Belt with the Mexican Highland. These zeolitic tuffs were formed from open hydrologic environments where…
TL emission characteristics have been studied from LiF(Mg,Cu,P) samples prepared at the Institute of Nuclear Physics in Krakow, Poland in which the Cu concentration has been varied from 0.002 mol% to 0.5 mol% while the Mg content (0.2 mol%) and P content (1.25 mol%) were kept constant. Thermoluminescence has been reco…