Materials Literature
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We present a detailed study of the magnetic properties of (Ga,Mn)N layers grown directly on 4H-SiC substrates by reactive molecular-beam epitaxy. X-ray diffraction and transmission electron microscopy demonstrates that homogeneous (Ga,Mn)N alloys of high crystal quality can be synthesized by this growth method up to a…
Mixtures of polystyrene- block -poly(methyl methacrylate) (PS−PMMA) having PMMA cylindrical microdomains with homopolymers of PMMA and poly(ethylene oxide) (PEO) were used to study the effect of the interaction between homopolymers confined to the cylindrical microdomains and the PS matrix on the microdomain spacing o…
Silver nanoparticles have been produced by γ-irradiation of silver solution in optically transparent inorganic mesoporous silica. The reduction of Ag + within the matrix is brought about by hydrated electrons and hydroalkyl radicals generated during the radiolysis of the 2-propanol solution. The particles formed withi…
The structure and properties of the {001} planar platelet in diamond are investigated using ab initio theory. We find that a carbonaceous model, based on a layer of self-interstitials, satisfies the requirements of transmission electron microscopy, infrared absorption data, and energetic considerations. The energetics…
We demonstrate movement of a head-to-head domain wall through a magnetic nanowire simply by passing an electrical current through the domain wall and without any external magnetic field applied. The effect depends on the sense and magnitude of the electrical current and allows direct propagation of domain walls throug…
We examine the effect of alloying Sn on the Sb site of ytterbium-filled skutterudites, a promising class of thermoelectric materials. We report measurements of the Hall effect, electrical resistivity, Seebeck coefficient, and thermal conductivity between 2 and 300 K on two series of samples having different ytterbium…
Single crystals of strontium borophosphate, SrBPO 5, have been grown with sizes up to 25 × 15 × 10 mm 3 from the BPO 4 flux by the top-seeded solution growth method. The compound crystallizes in the trigonal system, space group P 3 2 21 (No. 154), with a = 6.8850(10) Å, c = 6.8700(14) Å, and three formula units per ce…
In the present investigation, the novel two-step electrochemical process of room temperature synthesis of Hg-1212 superconducting films has been developed and reported first time. Electrochemical parameters were optimized by studying cyclic voltammetry (CV), linear sweep voltammetry (LSV) and chronoamperometry (CA) fo…
The lattice gas model for adsorption of alkaline elements on W(112) surface is studied by Monte Carlo simulations. The model includes dipole--dipole interaction as well as long-range indirect interaction. The numerical results show that truncation of the indirect interaction even at 200$Å$ may change a phase diagram,…
Poly(vinylidene difluoride) (PVDF) nanotubes were prepared by wetting of ordered porous templates. We processed either PVDF melts or solutions. The properties of the nanotubes depend strongly on the preparation method. Solution-wetting provides nanotube walls with poor crystallinity. In contrast, nanotube walls obtain…
The photoluminescence (PL) of high-quality CdSe nanocrystals (NCs) incorporated into polymer thin films was found to respond reversibly and rapidly to environmental changes upon photoradiation above their absorption onset. The PL of the NCs may be dramatically enhanced or diminished depending on the properties of the…
Stabilized concentrated citrate-reduced silver nanocolloids for use as pigments in ink-jet inks were prepared. Carboxymethyl cellulose was used as a polymeric stabilizer providing both electrostatic and steric stabilization. X-ray diffraction pattern, optical properties (UV−visible spectroscopy), size (TEM and dynamic…
Large, well-defined magnetic domains, on the scale of hundreds of micrometers, are observed in Ga1-xMn(x)As epilayers using a high-resolution magneto-optical imaging technique. The orientations of the magnetic moments in the domains clearly show in-plane magnetic anisotropy, which changes through a second-order transi…
The structure and chemical nature of Pt in combustion-synthesized Pt/CeO 2 catalysts have been investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), extended X-ray absorption fine structure (EXAFS), and temperature-programmed reaction (TPR). Catalytic…
A novel and general approach to scaling diffraction intensities is presented. The method minimizes the disagreement among multiple measurements of symmetry-related reflections using a stable refinement procedure. The scale factors are described by a flexible exponential function that allows different scaling correctio…
Abstract No abstracts.
We report here three examples of the reactivity of protic nucleophiles with diimine-type ligands in the presence of Fe(II) salts. In the first case, the iron-promoted alcoholysis reaction of one nitrile group of the ligand 2,3-dicyano-5,6-bis(2-pyridyl)-pyrazine (L1) permitted the isolation of an stable E-imido-ester,…
The compound Ag1.49Mn1.49IIMn1.51III(AsO4)3 (silver manganese arsenate) was prepared by a solid-state reaction. It crystallizes in the monoclinic system in space group C2/c. The three-dimensional network is built up from MnO6 octahedra, sharing edges which are linked together by the arsenate groups (AsO4). This arran…
We have observed the azimuthal switching at the interface of nematic liquid crystals (LCs) and the aligning substrate, induced by the planar electric field of a fine comb electrode. Optical transmittance as a function of applied voltage was modeled by both the elastic theory with rigid anchoring and the Landau-de Genn…
Abstract The high atom efficiency was achieved through addition of Ac 2 O in the Sc(OTf) 3 ‐catalyzed allylation of aldehyde with tetraallytin in a 4 : 1 molar ratio.