Materials Literature
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Using an optical technique to measure hydrogen sorption kinetics the catalytic activity of the NiOx clusters is determined. The thus measured temperature dependence reveals an activation energy of 0.58 eV. The catalytic activity of NiOx clusters is studied as a function of the oxygen concentration. The surface propert…
This paper presents a 4-Mb phase-change memory experimental chip using an MOS transistor as a cell selector. A cascode bit-line biasing scheme allows read and write voltages to be fed to the storage element with adequate accuracy. The chip was integrated with 3-V 0.18-/spl mu/m CMOS technology and experimentally evalu…
Single walled carbon nanotubes (SWNTs) are a promising gene and drug delivery system since their physical dimensions mimic nucleic acids. Towards this aim, the hydrophobicity of SWNTs was averted by coating with ribonucleic acid (RNA) polymer [poly(rU)] or bovine serum albumin (BSA) and the consequent diffusion of the…
Abstract We report the first observation of nonlinear lasing effects – stimulated Raman scattering (SRS) in synthetic polycrystalline diamond grown by the chemical vapor deposition technique. We classify this material as a promising χ (3) ‐active medium for new generation of Raman laser converters.
Sputtering deposition of spinel ferrites leads to a combination of attractive physical properties (optical, magnetic, and semiconducting), which can be adjusted by carefully selecting the preparation conditions and stoichiometry during controlled postdeposition annealing. Thin-sputtered ferrite films are of great inte…
Abstract Poly(ethylene‐ co ‐vinyl alcohol) hollow‐fiber membranes with a 44 mol % ethylene content were prepared by thermally induced phase separation. A mixture of 1,3‐propanediol and glycerol was used as the diluent. The effects of the ratio of 1,3‐propanediol to glycerol in the diluent mixture on the phase diagram,…
We have conducted visible pump-THz (THz—terahertz) probe measurements on single wall carbon nanotubes deposited on quartz substrates. Our results suggest that the photoexcited nanotubes exhibit localized transport due to Lorentz-type photoinduced localized states from 0.2 to 0.7 THz. Upon modeling the THz transmission…
Quantitative analysis of spatially resolved valence electron energy-loss spectra shows strong physical property contrasts for $\ensuremath{\Sigma}5$ and near $\ensuremath{\Sigma}13$ grain boundaries in Fe-doped ${\mathrm{S}\mathrm{r}\mathrm{T}\mathrm{i}\mathrm{O}}_{3}$, resulting in London dispersion interaction energ…
We present a quantitative theory for ferromagnetism in diluted magnetic semiconductors under the assumption that the positions of the substitutional magnetic impurities are correlated. The theory predicts that room-temperature ferromagnetism should be possible in macroscopically homogeneous samples of MnxGa1−xAs if th…
The growth of low dielectric constant (k) Boron Nitride (BN) film on silicon as wel1 as methylsilsesquioxane-based nanoporous films (LKD-5109) using plasma-discharged borazine was investigated. BN films were grown using microwave plasma (2.45GHz) or radio-frequency (rf) atom beam deposition (13.56MHz) on LKD-5109 in o…
Abstract A series of fluorinated polyamideimides (PAIs) were synthesized by the direct polycondensation of a novel diimide‐diacid, 1,4‐bis(trimellitimido‐2‐trifluoromethylphenoxy) benzene (BTTFB), with aromatic diamines by using triphenyl phosphite (TPP) and pyridine as condensation agents in a medium consisting of N…
The crystalline structures of the ternary halides M2BaX4 (M=Cs, Rb; X=Br, Cl), and their luminescence when doped with Eu2+ ions, are reported. These compounds crystallize with the Th3P4 body-centered cubic structure, where the Rb or Cs and Ba cations randomly occupy the Th sites in a 2:1 ratio. The Cs2BaCl4 and Rb2BaC…
The development of nanophosphors of desired sizes and properties for various practical applications and its growth in quantitative amounts inside the pores of an inorganic matrix is presented. By doing so, nanophosphors get surface passivated and are stabilized against environmental attacks. Accordingly, in the presen…
Electrical transport properties of carbon nanotubes can be dramatically changed by mechanical deformations that alter tube shape and the corresponding positions of the atoms comprising the tube wall. In principle, detailed atomic/electronic calculations can provide both the deformed configuration and the resulting ele…
Use of multilayer dielectric thin films provides opportunities to optimize properties for different applications. In this work, the changes in the leakage current in Ba0.8Sr0.2TiO3 thin films upon introduction of ZrO2 layers of different thicknesses are studied. Unusual changes in the leakage current and the transitio…
The characterization of iron thin films grown at different substrate temperatures has been performed by x-ray diffraction (XRD) and extended x-ray absorption fine structure (EXAFS). The film growing of iron at low temperatures provides an excellent system to test the results obtained from both techniques because the c…
Abstract Sodium acrylate was grafted onto cornstarch by microwave irradiation to synthesize a superabsorbent, in which potassium persulfate (PPS) was used as the initiator and polyethyleneglycol diacrylate as the crosslinker. It was found that microwave irradiation could substantially accelerate the synthesis, without…
In this investigation, (1−x)(Bi0.9La0.1)(Ga0.05Fe0.95)O3-x(Pb0.9Ba0.1)TiO3(BLGF-PBT) crystalline solutions have been fabricated by using the solid-state reaction method. A ferroelectric rhombohedral/tetragonal morphotropic phase boundary (MPB) of (1−x)BLGF-xPBT was observed for x=0.4. In the vicinity of MPB, 0.6BLGF-0…
We have investigated the origin of the huge magnetocaloric effect in a manganite system with ferro–antiferromagnetic phase mixture at low temperatures. We carried out magnetic measurements in fields up to 100 kOe in order to show that both a high hysteretic behavior and a metamagnetic transition in the antiferromagnet…
Magnetoelectric composites were created through incorporating dispersed CoFe2O4 ferromagnetic grains into a Sr0.5Ba0.5Nb2O6 relaxor ferroelectric matrix. The two phases are chemically compatible and coexist in the dense, sintered composites. Unlike other relaxors, the Sr0.5Ba0.5Nb2O6-containing composites can be elect…