Materials Literature
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The analysis of gratings of arbitrary depth, profile, and permittivity is conducted by cutting the modulated region into different slices for which the differential theory of gratings is able to compute the diffracted field for both TE and TM polarization without numerical instabilities. The use of a suitable transiti…
A recent method for treating colloid-polymer mixtures is extended to study the phase behaviour of hard-sphere mixtures. It is shown that, for small size ratios ξ r 2 / r 1 , the addition of small spheres (radius r 2 ) to a system of large spheres (radius r 1 ) induces bulk phase separation into coexisting crystal and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExchange Interaction in Metal-Radical Systems: Chloro(meso-tetraphenylporphyrinato)chromium(III)'s and (Hexafluoroacetylacetonato)manganese(II) Ligated with 3- and 4-(N-Oxy-N-tert-butylamino)pyridinesMakoto Kitano, Yoichiro Ishimaru, Katsuya Inoue, Noboru Koga, and Hiizu Iwa…
Single crystals of ${\mathrm{Cs}}_{3}$${\mathrm{Lu}}_{2}$${\mathrm{Br}}_{9}$:1%${\mathrm{Er}}^{3+}$ were grown using the Bridgman technique. The low phonon energy of \ensuremath{\le}190 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ strongly suppresses multiphonon relaxation in this host. For a series of excited states ra…
Previously, twin systems of [111] were reported in L1[sub 0] TiAl. No pseudo twinning was observed in TiAl. This is probably due to the fact that the pseudo twins, [111], [211] or [121], result in L1[sub 1] like structure which has a higher energy in TiAl. Nevertheless, it was suggested that the pseudo-twinning might…
The incommensurate room-temperature (RT) structure of NbTe 4 undergoes a phase transition into an intermediate incommensurate low-temperature (LT) phase at low temperatures, before the lock-in transition into the commensurate low-temperature (C) phase occurs at ca 50 K. In an X-ray experiment, the additional satellite…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLigand Binding to Four-Atom-Linked Capped PorphyrinsNilkamal Bag, Tammy M. Grogan, Douglas Magde, Carla Slebodnick, Martin R. Johnson, and James A. IbersCite this: J. Am. Chem. Soc. 1994, 116, 26, 11833–11839Publication Date (Print):December 1, 1994Publication History Publis…
Abstract : This study was carried out to investigate the elevated temperature behavior of the SiC-MAS5 cross- ply (O/9O)4S ceramic matrix composite manufactured by Corning Inc. to fatigue with loading waveforms that combine the characteristics of stress rupture and high cycle fatigue. The test results were compiled in…
Abstract Proton spin diffusion measurements were made using the Goldman—Shen technique of bisphenol‐A polycarbonate containing 10 wt% trioctyl phosphate at temperatures below the glass transition temperature. The proton lineshapes reveal the existence of dynamic heterogeneities in the glass and spin diffusion can be o…
Alkalimetric and acidimetric titrations of montmorillonite suspensions were performed at ionic strengths varying from 0.005 to 0.5 M (NaNO<sub>3</sub>). Deprotonation of surface hydroxyl groups exposed at the edge sites of montmorillonite platelets causes an overall negative charge in the alkaline pH range. The PZNPC…
Abstract Neutron powder diffraction data of α -MnMoO 4 (space group C 2/ m ) are presented, which were collected with the diffractometer DN5 at the CEN Grenoble at T = 50 K and between 13 K and 5.5 K. Below T = 15.3 K, α -MnMoO 4 is antiferromagnetically ordered. The translational symmetry of the magnetic structure is…
The temperature dependence of the lattice constant for the parent phase in metallic sodium, which has a body-centred cubic (b.c.c.) structure, has been measured by an X-ray single-crystal diffraction method over a range of 20 to 293 K. An abnormal change of the lattice constant at around 40 K is shown, which is attrib…
Abstract Crosslinked cationic latexes based on polystyrene, poly[styrene‐ co ‐(methyl methacrylate)] and poly(methyl methacrylate) were prepared by an emulsion polymerization process using 2 mol‐% of a quaternary ammonium surfactant monomer. Phthalocyaninatocobalt(II)tetrasulfonate (CoPcTs) bound to these latexes were…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSoluble Polymer-Supported Catalysts Containing Pendant Quaternary Onium Salt Residues for Regioselective Addition Reaction of Epoxy Compound with Active EsterTadatomi Nishikubo, Atsushi Kameyama, Chika Maejima, Yuko Yamamoto, and Masao TomoiCite this: Macromolecules 1994, 27…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMiscibility, Microstructure, and Dynamics of Blends Containing Block Copolymer. 2. Microstructure of Blends of Homopolystyrene with Styrene-Butadiene Block CopolymersHanqiao Feng, Zhiliu Feng, and Lianfang ShenCite this: Macromolecules 1994, 27, 26, 7835–7839Publication Date…
When discussing diffusion processes of dopants at very high concentrations, i.e. , close to their solubility limit, it is absolutely necessary to take into account the fact that the number of substitutional sites accessible to additional donors/acceptors is decreasing or equal to zero when their concentration approach…
The diester was resynthesized to study its reported thermotropic biaxial nematic (Nb ) phase. A slightly different synthesis route using a monoprotected biphenol was used. All intermediates, as well as the final diester, were thoroughly characterized by high resolution NMR and in some cases elemental analysis to be ce…
Small-angle neutron scattering measurements of deformed single-crystal copper have been performed over a wavevector transfer range of 0.0655 ≤ Q ≤ 1.32 nm−1. The measurements included four samples deformed in compression at room temperature along the [110] direction to 6.8, 15.6, 35.0 and 54.3% reduction in thickness…
The contents of the HNO3- and EDTA-extractable micronutrients, Co, Cu, Mn and Mo, have been determined in 53 soil samples from nine Danish Spodosols and Ultisols. In most soils the contents decreased from surface to subsurface layers but increased at deeper depth. Correlation analysis showed close correlations between…
Radiation hardening and radiation-induced chromium (Cr) depletion were related to intergranular stress corrosion cracking (IGSCC) response among various stainless steels (SS). Available data on neutron-irradiated materials were analyzed and correlations developed between fluence, yield strength, grain-boundary Cr conc…