Materials Literature
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The temperature and field dependence of the magnetization have been measured to investigate the magnetic properties of the first oxalate–bpy mixed-ligand framework with a general formula M(ox)(bpy) (M = Fe(II), Co(II), Ni(II); ox = C2O42−; bpy = 4,4′-bipyridine). All compounds in the M(ox)(bpy) system crystallize in a…
Using the laser pyrolysis method, single phase gamma'-Fe4N nanoparticles were prepared by a two step method involving preparation of nanoscale iron oxide and a subsequent gas-solid nitridation reaction. Single phase Fe3C and Fe7C3 could be prepared by laser pyrolysis from Fe(CO)5 and 3C2H4 directly. Characterization t…
The properties of thick BaScxFe12−xO19 (0.3<x<0.6) scandium hexaferrite films were measured by static and microwave field techniques. Films were deposited by pulsed laser ablation onto c-plane sapphire at oxygen pressures of 20 and 50 mTorr. Vibrating sample magnetometer measurements as corroborated by x…
For a uniformly magnetized rectangular particle with dimensions in the ratio 5 : 1 : 0.1, the coercive and switching fields in the (1,1,1) direction are determined to be Hc/Ms=0.057069478 and Hs/Ms=0.057142805. Previous micromagnetic computations of coercive and switching fields that did not approach these values for…
Titanium oxide films with a thickness of a 400 nm were deposited on p-type Si(100) at 250 °C by electron-beam evaporation where titanium dioxide was evaporated in oxygen environment at a pressure of 2×10−6–4×10−5 Torr. Effects of oxygen flow rate (FO2) between 0 and 40 sccm on properties such as crystallinity, surface…
The deep-sea vent archaeon Pyrococcus abyssi strain ST549 was grown in batch cultures in closed bottles and by continuous culture in a gas-lift bioreactor, both in the presence and in the absence of elemental sulfur. Growth on carbohydrates, proteinaceous substrates and amino acids was investigated. The disaccharides…
A collagen-like peptide with the sequence (GER)(15) GPCCG was synthesized to study the formation of a triple helix in the absence of proline residues. This peptide can form a triple helix at acidic and basic pH, but is insoluble around neutral pH. The formation of a triple helix can be used to covalently oxidize the c…
The production of molecular hydrogen in the radiolysis of high-density polyethylene, isotactic polypropylene (PP), poly(methyl-methacrylate) (PMMA), and polystyrene (PS) by γ rays and 5–20-MeV helium ions was investigated. Molecular hydrogen is the dominant gaseous product from these polymers, and the yields with γ ra…
High-pressure synchrotron x-ray powder-diffraction studies show that trigonal $\ensuremath{\alpha}\ensuremath{-}{\mathrm{ZrMo}}_{2}{\mathrm{O}}_{8}$ transforms to a monoclinic symmetry phase $(\ensuremath{\delta}\ensuremath{-}{\mathrm{ZrMo}}_{2}{\mathrm{O}}_{8})$ at 1.06--1.11 GPa. The space group was determined to $C…
In this study, we observed the flow-induced silica structure, which was formed during in situ gelation in the presence of wormlike micelles of cetyltrimethylammonium bromide and structure-forming additive, sodium salicylate. A silicon alkoxide of tetramethyl orthosilicate was used for the in situ gelation as a precurs…
Recently, a novel automotive catalyst design, based on the use of palladium supported on yttria‐stabilized zirconia (YSZ), was proposed. In the present work, the coating of cordierite honeycomb samples with YSZ slurries for the preparation of such washcoats was investigated. The loading percentage, homogeneity, and re…
The double perovskite Sr2FeMoO6 is a half-metallic ferrimagnet exhibiting significant magnetoresistance (MR) at 300 K in a magnetic field H<2 kOe. A preliminary study of the influence of isovalent and aliovalent substitutions for Sr2+ on the magnitude of the room-temperature MR is reported. Of the polycrystalli…
${\mathrm{SrTiO}}_{3}$ (ST) doped with Bi shows three Bi-induced dielectric modes (modes A, B, and $C)$ that are superimposed upon the quantum paraelectric behavior of pure ST. In ST doped with low concentration Bi, the modes A and B exhibit dielectric behavior arising from noninteracting polar clusters. The evidence…
The reorientational dynamics within the rotationally disordered cubic plastic phase of solid ethanol is investigated by means of the concurrent use of computer molecular dynamics and quasielastic neutron scattering. Motions involving widely different time scales are shown to take place above the calorimetric ``glass t…
Piezoelectric Pb[(Zn 1/3 Nb 2/3 ) 0.91 Ti 0.09 ]O 3 (PZNT 91/9) single crystals with diameters of 40 mm were successfully grown from solution by the Bridgman method with a PbO flux supported on the bottom of the crucible. This type of Bridgman method is more suitable for growing large and heavy crystals than the hangi…
We report high-resolution measurements of the coefficient of thermal expansion, $\ensuremath{\alpha}{=l}^{\ensuremath{-}1}\ifmmode\times\else\texttimes\fi{}(\ensuremath{\partial}l/\ensuremath{\partial}T),$ on single crystals of the organic superconductors ${\ensuremath{\beta}}^{\ensuremath{''}}\ensuremath{-}{(\mathrm{…
An advanced process for the synthesis of polyphosphazenes with controlled architectures has been investigated. By this method, a wide range of well-defined phosphazene di- and triblock copolymers with controlled molecular weights and narrow polydispersities have been synthesized ( M n up to 4.8 × 10 4 with polydispers…
Cubic CuFe2O4 was prepared by coprecipitation in a polymer matrix. Crystallite size and particle size of the prepared samples, determined from x-ray data and transmission electron microscopy analyses respectively, are in the range of nanocrystalline materials. Cation distribution of the nanocrystalline samples was det…
Magnetization, resistance, and current–voltage (I–V) measurements have been performed in La0.5Sr0.5MnO3 compact prepared by pressing sol-gel nanoparticles (46 nm) at 723 K with a high pressure (4 GPa). The pressed compound orders ferromagnetically at 340 K (TC) and has a substantial drop in the thermomagnetic curve be…
In this article, we report the magnetic properties of ultrathin (15–200 Å) NiFe and CoFe films deposited using ion beam deposition techniques. They are symmetrically sandwiched between Ta, Cu, or Ta/Cu under and capping layers. NiFe and CoFe films grown between Ta/Cu and Cu/Ta bilayers exhibit the smallest magnetic th…