Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox chemistry of metalloporphyrins in aqueous solutionA. Harriman, M. C. Richoux, and P. NetaCite this: J. Phys. Chem. 1983, 87, 24, 4957–4965Publication Date (Print):November 1, 1983Publication History Published online1 May 2002Published inissue 1 November 1983https://doi…
The reaction sequence in the formation of Pb(Zr 0.6 Ti 0.4 )O 3 (PZT 60/40) was investigated as a function of PbO and ZrO 2 raw material variations, using powder X‐ray diffraction. Particular emphasis was placed on the final stages of reaction in the formation of PZT solid solution. Based on the present work, a more d…
The elastic strain associated with the field-induced transition from an antiferroelectric phase to a ferroelectric one has been measured at several temperatures in a PZT-family ceramic Pb0·99Nb0·02 [(Zr0·6Sn0·4)0·94Ti0·06]0·98 O3. Reproducible large strain change of about Δℓ/ℓ∼ due to the forced transition may be prom…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntramolecular photochemical electron transfer. 2. Fluorescence studies of linked porphyrin-quinone compoundsAleksander Siemiarczuk, Alan R. McIntosh, Te Fu Ho, Martin J. Stillman, Kenneth J. Roach, Alan C. Weedon, James R. Bolton, and John S. ConnollyCite this: J. Am. Chem.…
The plasma etching of the type H Kapton polyimide film has been studied in a parallel plate reactor with two different gas mixtures; and . High etching rate (0.5–3 μm/min) has been obtained in both cases. At a pressure of 0.2 Torr an anomalous loading effect is observed which is attributed to the nitrogen released by…
A modified indentation technique for measuring toughness is described. The method retains the elastic/plastic basis of previous contact fracture descriptions but eliminates explicit reference to residual stress parameters in the toughness formulation. Accordingly, improved correlations between indentation data and “co…
A short review is presented of the theoretical background of a physical model for the quantification of Auger electron spectroscopy (AES) for surface analysis. The recent studies on the data-base for the inelastic mean free paths (IMFP) by Seah and Dench and systematic calculations of the backscattering factors ( R )…
Sodium azide undergoes a transition from a high-temperature rhombohedral phase to a low-temperature monoclinic phase at 292.2 K. Results of x-ray diffraction studies of the low-temperature phase are reported which indicate that the transition is of the elastic type with the order parameter corresponding to a linear co…
Abstract The isothermal degradation of high cis ‐1,4‐polyisoprene vulcanizates having different crosslinking structures was investigated by a measurement of weight loss of sample, IR and NMR, gel permeation chromatography (GPC), and gas chromatography (GC). The degradation behavior of dicumy peroxide‐cured sample is s…
Studies have been carried out on the characteristic optical textures exhibited by mixtures of nematic and cholesteric compounds, namely, N-(P-propoxybenzylidene)p-pentylaniline (PBPA) and cholesteryl ethyl carbonate (CEC). Many of the textures are metastable and undergo a slow transformation at room temperature in the…
The different ways in which gold alloys can deteriorate are described. The principal alloys discussed are gold-copper, gold-silver and gold-copper-silver. Examples of South American gold alloys from Colombia and Panama are used to illustrate the different types of corrosive attack. Some problems related to the conserv…
A Miniaturized Disk Bend Test (MDBT) capable of extracting postirradiation mechanical behavior information from disk-shaped specimens no larger than those used for transmission electron microscopy has been successfully developed. Finite element analysis is performed to convert the experimentally measured data into use…
The depolarization behavior of ordered and disordered lead scandium-tantalate (PST) ceramics has been studied by Byer-Roundy and Chynoweth method. A sharp decrease of the spontaneous polarization takes place in a narrow temperature range very close to the Curie temperature Tc for the ordered PST materials. For the dis…
"Les Capteurs en Instrumentation Industrielle." Optica Acta: International Journal of Optics, 30(11), p. 1503
Contrast-enhancing agents for demonstrating abnormalities of the blood-brain barrier may extend the diagnostic utility of proton nuclear magnetic resonance (NMR) imaging. "TES," a nitroxide stable free radical derivative, was tested as a central nervous system contrast enhancer in dogs with experimentally induced unil…
Piezoelectric compositions Pb(MnuNbvNiwTixZry)O3 where u+v+w+x+y = 1.0 were studied by means of X-ray powder diffractometry, scanning electron microscopy and thermal analytical techniques. These studies showed that Mn is incorporated into the tetragonal lattice as trivalent ions at the Ti, Zr octahedral (B) sites.
Abstract The stability of common soil minerals found in Ultisols was studied relative to their natural soil solution composition. The mineralogy of the clay fraction (<2 µm) ranged from 22 to 60% in kaolinite, 0 to 20% in gibbsite, 17 to 57% in hydroxyinterlayered vermiculite (HIV), and 1 to 12% in quartz. Ion acti…
The effects of alloying elements on σ phase precipitation in δ–γ duplex phase stainless steels have been studied with particular emphasis on the partitioning of alloying elements. Sigma phase precipitation occurred mainly through the eutectoid decomposition of δ into σ and γ phases. The concentrations of Cr, Mo, W, an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSinglet molecular oxygen in micellar systems. 1. Distribution equilibriums between hydrophobic and hydrophilic compartmentsPlato C. Lee and Michael A. J. RodgersCite this: J. Phys. Chem. 1983, 87, 24, 4894–4898Publication Date (Print):November 1, 1983Publication History Publ…
Films of polystyrene or polymethyl methacrylate were cast on oxidized silicon substrates, then detached by the application of gas or water pressure from the back side of the film through a hole in the substrate. Critical detachment pressures showed good repeatability and could be used to calculate the work of adhesion…