Materials Literature
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The pyrometallurgical processing of spent fuel from the integral fast reactor (IFR), an advanced reactor under development at Argonne National Laboratory, will generate a chloride salt waste containing the alkali‐metal, alkaline‐earth, and some of the rare‐earth fission products. Salt‐occluded zeolite A, formed by equ…
The increase in iron-loss in soft magnetic materials due to the modulation depth in pulse width modulation (PWM) inverters is analyzed. In particular, the specific loss variations with different modulation indexes are measured, both in wound cores realized with high quality grain oriented magnetic material, and in ind…
Hydrogen-bonded ferroelectric liquid-crystalline complexes have been obtained by self-assembly of S-(+)-4-(2-methylbutoxy)benzoic acid and trans-4-alkoxy-4'-stilbazoles. Chiral smectic C phases are induced by the formation of the hydrogen bonds between the chiral nonmesogenic benzoic acid and the achiral stilbazoles.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxoanions derived from tungstosilicate (A-.beta.-SiW9O3410-): synthesis, single-crystal structural determination, and solution structural characterization by tungsten-183 NMR and IR of titanotungstosilicate (A-.beta.-Si2W18Ti6O7714-)Yin Lin, Timothy J. R. Weakley, Brian…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structure of bis[hydrotris(3,5-dimethylpyrazolyl)borato]samarium(II), Sm[HB(3,5-Me2pz)3]2, and the product of its reaction with azobenzeneJosef Takats, Xing Wang Zhang, Victor W. Day, and Todd A. EberspacherCite this: Organometallics 1993, 12, 11, 4286–4288Publ…
Premastered optical disk by superresolution (PSR) for practical use has been achieved for the first time. The PSR disk has a phase-change material Ge 2 Sb 2 Te 5 with stoichiometric composition. Superresolution results from a high contrast ratio of reflectance in the light spot between highly reflective crystal region…
Tris(dipivaloylmethanato)(2,9-dimethyl- 1,10-phenanthroline)lanthanide(III), [L n(DPM)3*DMOP], complexes (Ln = La, Eu, Tb, Ho) were synthesized from [Ln(DPM)3] and 2,9-dimethyl- 1,10-phenanthroline in carbon tetrachloride. The Eu3+ and Tb3+ complexes were characterized spectroscopically by infrared and luminescence te…
We recently introduced a method of variation of boundaries for the solution of diffraction problems [ J. Opt. Soc. Am. A10, 1168 ( 1993)]. This method, which is based on a theorem of analyticity of the electromagnetic field with respect to variations of the interfaces, has been successfully applied in problems of diff…
The diatoms are one of the best characterised algal groups. Despite this, little is known of the evolution of the group from the earliest cell to the myriad of taxa known today. Relationships among taxa at the family or generic level have been recognised in some diatoms. However, relationships at higher taxonomic leve…
The problem of scattering of high-energy electrons by solids is formulated on the basis of a kinetic equation (KE) for the one-particle density matrix. This equation provides a general treatment of spatial and temporal coherence of electrons and takes account of both elastic and inelastic scattering for arbitrary geom…
Phthalocyanines R, PcM (R = alkyl, M = H, Ni, Cu) substituted with alkyl chains have been synthesized and their liquid crystalline properties studied by differential scanning calorimetry and X-ray diffraction at small angles. The influence of the chain length on the mesomorphic properties has been determined. A model…
Oligothiophenes in solution and in the solid state have different conformational properties, as can be concluded from the spectroscopic and theoretical data and X‐ray structure of three di‐ and tetramethyl α‐conjugated quaterthiophenes (see Figure) reported here. magnified image
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and properties of liquid-crystalline polyacetylenes with a phenylcyclohexyl mesogenic moiety in the side groupSe Young Oh, Kazuo Akagi, Hideki Shirakawa, and Kotaro ArayaCite this: Macromolecules 1993, 26, 23, 6203–6206Publication Date (Print):November 1, 1993Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBehavior of benzene in siliceous faujasite: a comparative study of deuteron NMR and molecular dynamicsLucy M. Bull, Neil J. Henson, Anthony K. Cheetham, John M. Newsam, and Stephen J. HeyesCite this: J. Phys. Chem. 1993, 97, 45, 11776–11780Publication Date (Print):November 1…
Semiempirical cluster calculations are performed on positive (${\mathrm{E}}_{1}^{\ensuremath{'}}$ center) and neutral oxygen-vacancy defects in \ensuremath{\alpha}-quartz. A comparison is made of the various available Hamiltonians and the use of unrestricted wave functions. The results predict that these two defects f…
Isothermal growth of β‐Si 3 N 4 crystals dispersed in an oxynitride glass (Y‐Si‐Al‐O‐N) was studied by electron microscopy after heat treatment at temperatures between 1550° and 1640°C for 1 to 18 h. The β‐crystals exhibited growth striations introduced by intermediate coolings and these striations were used for devel…
Diffusionless tetragonal ( t′ ) cubic ( c′ ) phase transformation in 65‐mol%‐CeO 2 ‐ZrO 2 was investigated around the c′‐t′ equilibrium temperature T 0 c′‐t′ using powder X‐ray diffraction, where c′ was defined as a tetragonal or cubic phase with an axial ratio of unity. The {400} peak profile of t′ ‐ZrO 2 broadened…
In order to demonstrate experimentally that the competition between the antiferroelectric and ferroelectric interactions stabilizing Sm${\mathit{C}}_{\mathit{A}}^{\mathrm{*}}$ and Sm${\mathit{C}}^{\mathrm{*}}$ (the pairing energy of the transverse dipole moments in adjacent smectic layers and the packing entropy resul…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxalate-bridged dinuclear chromium(III)-M(II) (M = copper, nickel, cobalt, iron, manganese) complexes: synthesis, structure, and magnetismMasaaki Ohba, Hiroko Tamaki, Naohide Matsumoto, and Hisashi OkawaCite this: Inorg. Chem. 1993, 32, 23, 5385–5390Publication Date (Print):…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransition metal derivatives of a chelating nitronyl nitroxide ligand. Nickel(II) and manganese(II) complexesDominique Luneau, Gerard Risoan, Paul Rey, Andre Grand, Andrea Caneschi, Dante Gatteschi, and Jean LaugierCite this: Inorg. Chem. 1993, 32, 24, 5616–5622Publication D…