Materials Literature
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${}^{55}\mathrm{Mn}$ NMR line shape measurements in ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ for $0.20\ensuremath{\le}x\ensuremath{\le}0.50$ provide experimental evidence about the existence of two distinct regions in the $T\ensuremath{-}x$ magnetic phase diagram, where the homogeneous fer…
BaFe 12 O 19 films on (001) sapphire substrates are prepared by laser deposition with in situ heating and postannealing. The properties of the films are analyzed by x-ray diffractometry, vibrating sample magnetometer, atomic force microscopy, and Raman spectroscopy. The relationship among the coercivity, crystalline o…
The composition variations occurring in decaying SF 6 arc plasmas in the presence of atoms released from the vaporization of organic insulators (e.g. Teflon, polyethylene, polypropylene, megelit, nylon), copper, oxygen and water were studied between 12 000 K and 300 K by means of a chemical kinetics model. From the re…
Electronic and ionic structures of lead vacancies in PbTiO3 were studied using an ab initio approach. Even though the lead vacancy is found to be an acceptor with stable charge states ranging from 2- to 4- it does not form a tightly bound defect pair with a double donor oxygen vacancy. The formation of distant and nea…
Nanosize particles (average size ∼12 nm) of mixed ferrite Mn0.65Zn0.35Fe2O4 were prepared by the hydrothermal precipitation route and studied using x-ray diffraction, transmission electron microscopy, differential scanning calorimetry, magnetization measurements, and Mössbauer spectroscopy. The as-prepared sample was…
While low-temperature Hall resisitivity ${\ensuremath{\rho}}_{\mathrm{xy}}$ of ${\mathrm{La}}_{2/3}(\mathrm{C}\mathrm{a},\mathrm{P}\mathrm{b}{)}_{1/3}{\mathrm{MnO}}_{3}$ single crystals can be separated into ordinary (OHE) and anomalous (AHE) contributions, no such decomposition is possible near the Curie temperature…
The concept of local homogenization is invoked in the visible and subvisible frequency regimes to estimate the permittivity dyadics of thin-film helicoidal bianisotropic media (TFHBM)—a canonical class of sculptured thin films with a helicoidally periodic microstructure—made of a metal. Examination of the components o…
To modify cellulose powder surface, the grafting of polymers with controlled molecular weight and narrow molecular weight distribution onto the surface by the termination of living polymer cation with amino groups introduced onto cellulose powder surface was investigated. The introduction of amino groups onto cellulos…
X-ray photon correlation spectroscopy and small-angle scattering measurements are presented of the dynamics and structure of concentrated suspensions of charge-stabilized polystyrene latex spheres dispersed in glycerol, for volume fractions from 3% to 52%. The static structures of the suspensions show essentially hard…
Sonoluminescence spectra were collected from Cr(CO)6 solutions in octanol and dodecane saturated with various noble gases. The emission from excited-state metal atoms serves as an internal thermometer of cavitation. The intensity and temperature of sonoluminescence increases from He to Xe. The intensity of the underly…
The dynamic behavior of nickel atoms in graphitic carbon onions, observed by in situ atomic-resolution electron microscopy, shows the formation of stable new C-Ni phases. Nickel is observed to take substitutional in-plane positions in graphene layers, forming a planar graphitelike C-Ni lattice. Evidence is furthermore…
The phase behavior of rod-plate mixtures was investigated using model systems containing unambiguously rod- and plate-shaped colloids. We find that the theoretically disputed biaxial nematic phase is unstable with respect to demixing into an isotropic and two uniaxial nematic phases. The phase behavior at very high de…
Co–Ni–Cu/Cu multilayered nanowires were prepared by electrodeposition using nanoporous aluminum oxide membranes rather than the more usual track-etched polycarbonate membranes as templates. Very large values of the current perpendicular to plane giant magnetoresistance (CPP-GMR) were recorded: 55% at room temperature…
We studied a polymer brush composed of homodisperse end-grafted chains in a binary A−B solvent mixture by means of numerical self-consistent-field calculations. The focus is on the case that the solvents have a solubility gap in the bulk phase behavior, and we investigated the system near the bulk binodal. We assume t…
The transition metal hydride cations, TMH + (TM = first transition metal row, Sc, Ti, V, Cr, Mn, Co, Ni, Cu, and Zn), have been studied using valence bond (VB) theory to elucidate the bonding in these systems through VB concepts. Although the bonds appear extremely covalent by virtue of charge distribution, this appea…
The tetraacetates of α- and β-methylglycosides of d -glucose were reacted with dibutyltin dimethoxide in hot toluene with elimination of methyl acetate. The stannylenated glucose derivatives having a five- and six-membered tin-containing ring were isolated in a crystalline form. The soluble α-glycoside was used as cyc…
A series of monodisperse poly(styrene -b- isoprene[ -g- perfluoroacyl]) block copolymers was synthesized by sequential anionic polymerization of styrene and isoprene. The perfluorinated ester side chains were attached to the remaining double bonds of the isoprene block via oxidative hydroboration and esterification of…
The conformational transition behavior around the glass transition temperature has been studied by means of molecular dynamics through a model system, atactic polypropylene in bulk. Various criteria of the conformational transition were examined. A domain at barrier site is defined as the transition state of the confo…
Molecular dynamics via broad-band dielectric relaxation spectroscopy (DRS) are obtained on a class 3 network-forming system: a generic cyanate ester resin. The potential for in-situ monitoring of the network-forming reaction is explored. The segmental dynamics of the growing network are investigated, and a hitherto un…
The effect of solid−liquid interfacial energy on the long-range attraction between self-assembled thiolate monolayers in water has been studied by direct force measurements. The solid−liquid interfacial energy was tuned by changing the properties of the solid surface: the thiolate monolayers were prepared by self-asse…