Materials Literature
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The induced polarization and longitudinal strain behavior of lanthanum‐ and titanium‐modified antiferroelectric lead zirconate ceramics were measured as functions of electric field as high as 30 kV/mrn (300 kV/cm). Two field‐induced phase transitions were observed, both in polarization and strain. Polarization and str…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSiO2 as a Starting Material for the Synthesis of Pentacoordinate Silicon Complexes. 1K. Y. Blohowiak, D. R. Treadwell, B. L. Mueller, M. L. Hoppe, S. Jouppi, P. Kansal, K. W. Chew, C. L. S. Scotto, F. Babonneau, and Cite this: Chem. Mater. 1994, 6, 11, 2177–2192Publication D…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, Chemical Characterization, and Bonding Analysis of the [Ag{Fe(CO)4}2]3-, [Ag4{.mu.2-Fe(CO)4}4]4-, and [Ag5{.mu.2-Fe(CO)4}2{.mu.3-Fe(CO)4}2]3- Cluster Anions. X-ray Structural Determination of[NMe3CH2Ph]4[Ag4Fe4(CO)16] and [NEt4]3[Ag5Fe4(CO)16]Vincenzo G. Albano, F…
The corrosion mechanism of copper at 373 and 300 K in the presence of submicron particle deposits has been investigated. Several in situ techniques have been used to monitor the corrosion process in real time. At and above the critical relative humidity of , dissolution of Cu is followed by formation of , oxidation of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Anionic Biosurfactant on Hexadecane Partitioning in Multiphase SystemsSreekala. Thangamani and Gina S. ShreveCite this: Environ. Sci. Technol. 1994, 28, 12, 1993–2000Publication Date (Print):November 1, 1994Publication History Published online1 May 2002Published in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTActivation Barriers for Oxygen Diffusion in Polystyrene and Polycarbonate Glasses: Effects of Low Molecular Weight AdditivesYuanping Gao, Arthur M. Baca, Bojie Wang, and Peter R. OgilbyCite this: Macromolecules 1994, 27, 24, 7041–7048Publication Date (Print):November 1, 1994…
The connection between the Bremmer (reflection) series method and the R-matrix propagation method for modeling diffraction gratings is revealed. Both methods have been previously demonstrated to be immune from the problem of loss of significant digits caused by the growing and decaying exponential functions. It is mat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew Early Transition Metal Porphyrins: A New Route to Diorgano Complexes of Zirconium and Hafnium and the Preparation of Cationic DerivativesHolger Brand, Joseph A. Capriotti, and John ArnoldCite this: Organometallics 1994, 13, 11, 4469–4473Publication Date (Print):November…
Dielectric properties based on tautomerization in 9-hydroxyphenalenone derivatives were examined. While the 5-methyl derivative 2 exhibits an antiferroelectric transition at 41 K, such a phase transition was not observed in 5-bromo derivative 3 down to 4.2 K. Suppression of the phase transition in the latter may be in…
Strong interest has been generated in recent years regarding the modification of polyolefins to be functionalized or engineered for new materials with superior properties. Functional and engineered polyolefins are becoming more and more commercially important and expanding their applications as demonstrated by the sci…
Some velocity field results from the Surface Tension Driven Convection Experiment (STDCE) that was conducted aboard the USML-1 Spacelab in 1992 are reported. 10 cSt silicone oil was placed in an open circular container (10 cm wide×5 cm deep) and heated either by a cylindrical heater (1.11 cm diam) placed along the cen…
The design of narrow bandgap polymers remains a major challenge in the field of organic conductors. An alternative scheme is proposed for reducing the bandgap, namely the construction of a one‐dimensional graphitelike chain. Terthienyl frozen in a fully planar syn conformation is used as a simplified model compound fo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of Polyelectrolyte Stars and Convex Polyelectrolyte BrushesSanjay Misra, Wayne L. Mattice, and Donald H. NapperCite this: Macromolecules 1994, 27, 24, 7090–7098Publication Date (Print):November 1, 1994Publication History Published online1 May 2002Published inissue…
An EXAFS (extended x-ray-absorption fine structure) study of nanocrystalline iron prepared by high-energy ball milling is presented. Accurate data analysis has been performed using a recently developed ab initio multiple-scattering method (GNXAS). The crystalline iron EXAFS spectrum, taken as reference, has been analy…
Changes in pH, chloride (Cl–) concentration, and potential inside a rectangular crevice of metal against polymethyl methacrylate (PMMA) were monitored using microelectrodes as a function of time and externally applied potential. The environment inside the crevice was altered within the experimental time frame only whe…
The acoustic effects of free-running 2.12 μm Cr:Tm:Ho:YAG laser pulses delivered in water are studied. Laser pulses of 10 to 1200 mJ energy and 230 μs duration (full width at half-maximum) are used. Delivery fiber diameters of 200–600 μm are investigated. Combined fast flash video imaging and needle probe hydrophone p…
The statistical analysis of data in the form of orientations is a relatively new discipline and results from the literature on this subject are not yet widely known outside the statistics community. This paper provides an introduction to and the key references for statistical methods for analysing orientation data. Mo…
Abstract The experimental data obtained for the nucleation of microcellular foams are compared with the theoretical model developed in the first part of this paper. Polystyrene (PS) with rubber particles as nucleation sites is used as an exploratory system. Nitrogen is used as a physical blowing agent to nucleate the…
The effect of supramolecular structure and morphology on the solid state luminescence of polymers is explored through a rod-coil copolymer system, poly(benzobisthiazole-1,4-phenylene-co-benzobisthiazole decamethylene), which forms nanocomposites at compositions below 50 mol% rods. The composition dependence of the pho…
The hypothesis that a synergistic effect by fine SiC dispersoids operating on the submicrometer scale is capable of enhancing the deformation and fracture properties of Si 3 N 4 ceramics has been examined. In order to single out the effect of the SiC dispersion from other microstructural factors affecting the material…