Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of 2,3-norbornadienonaphthaceneHarish K. PatneyCite this: J. Org. Chem. 1988, 53, 26, 6106–6109Publication Date (Print):December 1, 1988Publication History Published online1 May 2002Published inissue 1 December 1988https://pubs.acs.org/doi/10.1021/jo00261a023https:…
Isolated Ba ferrite particles are prepared by the conventional powder metallurgical method, and the magnetic domains of about 200 particles 0.5 to 5 µm in size are investigated by the colloid-SEM method (the Bitter method using a scanning electron microscope). The relationship between the three-dimensional sizes of Ba…
Abstract This paper presents the first Table of RIR values for quantitative analysis as a model for regular updates which will appear in future issues. Diffractionists interested in the reference intensity method of quantitative analysis are urged to read the criteria for preparing data to continue this Table and then…
Electrochemical reduction of in various electrolytes at 150°C has been found to result in the formation of vanadium pentoxide bronzes of formula according to the reaction scheme: with for , respectively. X‐ray diffraction experiments show that bronzes exhibit, at least in the compositional range , an orthorhombic stru…
We call magnetization swirls small vortex-like micromagnetic structures at the surface of soft magnetic (low-anisotropy) materials which are magnetized perpendicular to the surface in their core region. In this paper the occurrence of swirls is discussed and their structure is explored by a Ritz method calculation. Th…
The X-Ray Powder Data File (XRPDF) enables one to identify the compounds in a sample. More often than not, however, a semi-quantitative analysis is wanted. Visual inspection of the pattern may give a vague impression of the composition, but the errors of such a result are usually not within reasonable limits. Clearly…
Abstract Earth alkaline titanates which are commonly used as dielectrics in ceramic capacitors may exhibit a long‐term degradation of the insulation resistance under simultaneous dc field and temperature stress. In order to study the nature of this process, it is necessary to detect the time evolution of the potential…
Symmetry properties of the converse piezoelectric effect are investigated for their use in fiber-optic sensing of individual electric field components. Three basic sensor designs are analyzed in detail. Suitable sensor materials are identified and relevant material properties are discussed. The sensitivity of the sens…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic, structural, electrochemical, and kinetic studies of ligand substitution in the 33e dinuclear radical Fe2(CO)7(.mu.-PPh2) and the 34e analogs [Fe2(CO)7(.mu.-PPh2)]- and FeCo(CO)7(.mu.-PPh2)R. T. Baker, J. C. Calabrese, P. J. Krusic, M. J. Therien, and W. C. Tro…
In the system ZrO 2 ‐Al 2 O 3 , cubic ZrO 2 solid solutions containing up to 40 mol% Al 2 O 3 crystallize at low temperatures from amorphous materials prepared by the simultaneous hydrolysis of zirconium and aluminum alkoxides. The values of the lattice parameter, a, increase linearly from 0.5095 to 0.5129 nm with inc…
The possible effect of different salinities on the valve morphology of the marine centric diatom Thalassiosira decipiens was investigated. Cultures were grown in media of salinities ranging from 2 to 35%. for 40 days. Only the 15, 20, 25, and 30%. cultures had sufficient growth for statistical analysis of population d…
For the first time carbohydrate derivatives were systematically studied as doping material for a liquid crystalline phase. These compounds can exhibit a large twisting power. It may be controlled by the configurations of single chiral centers. Thus, a series of phenomena are realized in the cholesteric phase such as h…
We have used a membrane-leak mass spectrometer to follow the time courses of H2 evolution and substrate reduction by nitrogenase [reduced ferredoxin:dinitrogen oxidoreductase (ATP-hydrolyzing), EC 1.18.6.1]. In the absence of added substrates, dinitrogenase passes all of its electrons to protons to form H2, but when a…
The rapid progress of the young liquid crystal display (LCD) technology is due to the synergisms resulting from combining research on electro-optical effects, liquid crystal materials and display technology. The design and production of liquid crystal molecules with specific physical properties and their application i…
A problem in controlled release pharmaceutical systems is formulated and studied. The device modeled is a polymer matrix containing an initially immobilized drug. The release of the drug is achieved by countercurrent diffusion through a penetrant solvent with the release rate being determined by the rate of diffusion…
Abstract An experimental study of binary and ternary phase equilibrium in the system polycaprolactone (PCL) poly(vi‐nylchloride) (PVC)‐77/23 styrene‐acrylonitrile copolymer (SAN) is described. Miscibility is determined using differential scanning calorimetry (DSC) and turbidity. PCL/PVC and PCL/SAN are largely miscibl…
The titanyl complex, TiO(C22H22N4), a complex of the ligand (I) obtained by the hydrolysis of the corresponding dichloride, has a reactive Ti=O function which readily interacts with other metal species forming μ-oxo heterobinuclear dimers. In these adducts, the Ti=O functions as a base toward oxophilic metal centres s…
SUMMARY Previous investigations had shown that about 80 years of Norway spruce monoculture on an ochreous brown earth of the Belgian Ardennes were sufficient to accentuate the weak podzolization process already present in the climax beechwood soil and to increase the weathering of several minerals, e.g. 2:2 clay miner…
The crystal structures of the minerals in the cuspidine-wohleritc- lavenite group can be described in terms of two kinds of modules whose connections form the structures of the various phases: "octahedral walls" four columns wide and running along c, and diorthosilicate groups. The octahedral walls are interconnected…
This book presents the highlights of modern solid state chemistry, an emerging area of chemical science. In adopting a unified and up-to-date approach the authors take the reader to the very frontiers of the subject, which is concerned primarily with new methods of synthesis, identification and characterization of sol…