Materials Literature
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Oxygen‐diffusion coefficients were determined in single crystals of MgO and α‐Fe 2 O 3 by exchanging the samples with 18 O enriched gas at 1 atm and measuring 18 O profiles using a proton activation technique. For MgO, in the temperature range 1580 to 1820 K, the diffusion coefficient is represented by:
The space-group frequency for approximately 30 000 organic compounds in the NBS Crystal Data Identification File has been calculated for each of the 230 space groups. 75% of the compounds have been reported in only five space groups: P21/c (36.0%), P{\bar 1} (13.7%), P212121 (11.6%), P21 (6.7%) and C2/c (6.6%). In con…
A secondary battery utilizing polythiophene films as cathode and anode active materials in an electrolyte of TBABF 4 /MeCN is studied. The cell potential, energy density and maximum power density (based on the weight of cathode and anode films) are observed to be 3.1 V, 93 Wh/kg and 89 kW/kg, respectively, for the dop…
Abstract The pinning site inhomogeneities interacting with a domain wall are characterized by the maximum restoring force, f, acting on an area A of domain wall. The critical field, H 0, required to release this area from the pin is given by f/2IA where I is the magnetic moment per unit volume. The area A is not indep…
Replicate samples of Phragmites communis roots coated with hydrous iron oxide were analyzed for internal and external Fe using the dithionite‐citrate‐bicarbonate technique (hot DCB), a modified DCB technique (cold DCB), Ethylenediamine tetraacetic acid (EDTA), Diethylenetriamine pentaacetic acid (DTPA), and a total Fe…
Diffraction by an arbitrarily oriented planar grating with slanted fringes is analyzed using rigorous three-dimensional vector coupled-wave analysis. The method applies to any sinusoidal or nonsinusoidal amplitude and/or phase grating, any plane-wave angle of incidence, and any linear polarization. In the resulting (c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAliphatic hydroxylation catalyzed by iron porphyrin complexesJohn T. Groves and Thomas E. NemoCite this: J. Am. Chem. Soc. 1983, 105, 20, 6243–6248Publication Date (Print):September 1, 1983Publication History Published online1 May 2002Published inissue 1 September 1983https:…
An equation describing the initial magnetisation curve and hysteresis loops of ferromagnetic materials has been derived theoretically based on a mean field approximation. The mutual interaction of the moments is expressed as a coupling coefficient and a restraining force on the motion of the domain walls, caused by th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEpoxidation reactions catalyzed by iron porphyrins. Oxygen transfer from iodosylbenzeneJohn T. Groves and Thomas E. NemoCite this: J. Am. Chem. Soc. 1983, 105, 18, 5786–5791Publication Date (Print):September 1, 1983Publication History Published online1 May 2002Published inis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic asymmetric epoxidations with chiral iron porphyrinsJohn T. Groves and Richard S. MyersCite this: J. Am. Chem. Soc. 1983, 105, 18, 5791–5796Publication Date (Print):September 1, 1983Publication History Published online1 May 2002Published inissue 1 September 1983http…
We report measurements of the optic index of refraction as a function of temperature, $n (T)$, in the crystalline ferroelectrics having the simple perovskite ($\mathrm{AB}{\mathrm{O}}_{3}$) structure. We show that these crystals possess a local, randomly oriented, nonreversible polarization below a temperature ${T}_{d…
The purpose of the present survey is to review the analysis of composite materials from the applied mechanics and engineering science point of view. The subjects under consideration will be analysis of the following properties of various kinds of composite materials: elasticity, thermal expansion, moisture swelling, v…
Integropartial differential equations of the linear theory of nonlocal elasticity are reduced to singular partial differential equations for a special class of physically admissible kernels. Solutions are obtained for the screw dislocation and surface waves. Experimental observations and atomic lattice dynamics appear…
The calculation of correlation functions describing the structure in space of one-dimensional systems is discussed, and various approaches to this problem are analysed. Examples of the use of correlation functions to interpret experimental X-ray and neutron scattering data and to calculate transition temperatures in q…
The methods of synthesis, the properties, and the structure of new composite materials based on polymers and on clusters of the transition metals are discussed. The properties of metal–polymer systems of this type are shown to be very different from those of ordinary metal–polymer systems, in which the metal particle…
A powerful calculational low-energy electron-diffraction scheme is introduced for super lattices with unit cells of any size: beam-set neglect. It is applied in the first structural analysis from low-energy electron-diffraction intensities of a large molecule, benzene, adsorbed on a single-crystal metal surface, Rh(11…
The influence of long-range interactions between particles on the commensurate-incommensurate phase transition is investigated. The local theory (Landau theory, elasticity theory) is shown to be invalid at large distances. The effectiveness of different long-range interactions is examined. The electrostatic forces app…
Two types of grain boundary sliding are established and investigated during Zn bicrystal deformation: “pure” grain boundary sliding (GBS) which is not associated with intragranular sliding (IS) and GBS which develops simultaneously with IS. Both types of GBS exhibit greatly similar structural peculiarities but under i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMollusk shell formation: isolation of two organic matrix proteins associated with calcite deposition in the bivalve Mytilus californianusStephen WeinerCite this: Biochemistry 1983, 22, 17, 4139–4145Publication Date (Print):August 16, 1983Publication History Published online1…
Total-configurational-energy calculations have already been very successfully carried out for periodic structures and for isolated molecules, allowing one to study, e.g., crystal structures, reconstructions, and vibrational frequencies. We describe here for the first time a method for calculating the total energy of i…