Materials Literature
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We have grown ${\mathrm{Bi}}_{1\ensuremath{-}x}{\mathrm{Sb}}_{x}$ alloy thin films on $\mathrm{CdTe}(111)B$ over a wide range of Sb concentrations $(0<~x<~0.183)$ using molecular-beam epitaxy. Temperature-dependent electrical resistivity (\ensuremath{\rho}) and thermoelectric power (S) were studied. We have obse…
Effect of surface nonradiative recombination on kinetics and total yield of the interband photoluminescence (PL) of c-Si wafers excited at room temperature by short laser pulses is studied. Numerical simulations show that a correlation of the PL quenching with the surface defect density takes place even at the high ex…
A spectroscopic ellipsometry technique is used to attempt a quantitative analysis of thin Si/SiO2 nanocomposite films obtained by magnetron co-sputtering. The layers are first fabricated with varying values of deposition temperature and sputtered silicon area, before being annealed at different temperatures. Using an…
Sm ( Co bal Fe 0.1 Cu x Zr 0.033 ) z magnets with higher Cu content were found to have higher intrinsic coercivity Hci at both room temperature and higher temperatures up to 500 °C. For the magnets with a ratio z=8.5, the intrinsic coercivity reaches a maximum of about 40 kOe at room temperature when the Cu content x…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSelf-Assembled Rigid-Rod IonophoresNaomi Sakai, Nirmalya Majumdar, and Stefan MatileView Author Information Department of Chemistry, Georgetown University Washington, D.C. 20057 Cite this: J. Am. Chem. Soc. 1999, 121, 17, 4294–4295Publication Date (Web):April 15, 1999P…
Extended vacuum annealing of rutile ${\mathrm{TiO}}_{2}(110)$ produces macroscopic and nanoscopic changes in the surface morphology. These result from the ordering of oxygen ${\mathrm{v}\mathrm{a}\mathrm{c}\mathrm{a}\mathrm{n}\mathrm{c}\mathrm{i}\mathrm{e}\mathrm{s}/\mathrm{T}\mathrm{i}}^{n+}$ interstitials in bulk ${…
Epitaxial CrO2 thin films have been grown on TiO2(100) and Al2O3(0001) substrates by atmospheric pressure chemical vapor deposition. The films have a Curie temperature (Tc) of around 393 K with the ones grown on TiO2 exhibiting in-plane uniaxial magnetic anisotropy. They also display metallic characteristics, with roo…
The quasiparticle density of states (DOS) in the vortex state has been probed by specific heat measurements under magnetic fields (H) for clean and dirty s-wave superconductors, Y(Ni1-xPtx)2B2C and Nb1-xTaxSe2. We find that the quasiparticle DOS per vortex is appreciably H-dependent in the clean-limit superconductors,…
Magnetoresistance observed in pressed powder compacts of half-metallic ferromagnetic oxides is reviewed. The main, isotropic negative magnetoresistance, which exceeds 50% in CrO2 at low temperature, is due to alignment of the the ferromagnetic moments of contiguous ferromagnetic grains. The effect is related to interp…
Enhanced energy product and higher operating fields can be achieved by improving the squareness of the demagnetization loop. In isotropic materials, increasing loop squareness can be achieved by minimizing microstructural gradients and maximizing homogeneity. Achieving homogeneity by melt spinning can be difficult due…
Perpendicular barium ferrite (BaM) films with Pt interlayers were successfully fabricated. The magnetic and structural properties of BaM films were compared with BaM films without Pt interlayers. It was found that perpendicular c-axis orientation was greatly improved for films with Pt interlayers. Perpendicular remane…
The solubilities of four amino acids, l -cystine, l -tyrosine, l -leucine, and glycine, in aqueous solutions containing another amino acid have been measured at 298.15 K, 308.15 K, and 318.15 K. In aqueous solutions containing l -cystine and l -tyrosine, which have a low solubility, the solubility of the other amino a…
Investigation of preliminary evidence that Ga, Sc, and In influence the bulk and dynamic magnetic properties of hexagonal ferrites by means other than those supported in existing models has been undertaken. In SrFe12−xMxO19 (M=Ga, In) and BaFe12−xScxO19, the predominant 12k sublattice exhibits a remarkable splitting i…
First-principles calculations within the density-functional theory are carried out on carbon nanotubes with finite as well as infinite lengths. Quantum confinement effects, different from those in silicon clusters and carbon nanoparticles are predicted. It is shown that the electronic density of states of finite-lengt…
The kinetics of the thermal cure reaction of Bisphenol A dicyanate (BACY) in presence of various transition metal acetyl acetonates and dibutyl tin dilaurate (DBTDL) was investigated using dynamic differential scanning calorimetry (DSC). The cure reaction involved a pregel stage corresponding to around 60% conversion…
The present article describes CoxFe3−xO4 films, which were fabricated at 90 °C by the ferrite-plating method and have the excellent perpendicular magnetic anisotropy and the perpendicular coercivity Hc⊥ above 2 kOe. The films were composed of Co ferrite and Fe3O4 grains. The highest Hc⊥ reached 3 kOe at the compositio…
The phase transformation and magnetic properties of (Nd0.95La0.05)9.5FebalCo5Nb2B10.5 nanocomposite have been investigated systematically via thermomagnetic analysis, vibration sample magnetometer, x-ray diffraction, and conventional transmission electron microscopy. The Henkel plot was employed to quantify the streng…
The temperature dependence of coercive field Hc of the FeCo-based soft magnetic alloy associated with the microstructure has been investigated and correlated with microstructural features, such as structural ordering, second phases, and the grain size. An increase in the structural ordering parameter, determined by ne…
Starting from the formally exact Liouville equation, we derive a generalized Langevin equation for the simultaneous correlated motion of several molecules in dense melts. Our calculations are based upon phase space kinetic theory and Mori–Zwanzig projection operator techniques. In the overdamped regime, a set of nonli…
Using the aqueous cores of reverse micelles as nanoreactors, nanoparticles (d∼10 nm) of the mixed ferrite MnFe2O4 were produced. Seven processing trials were performed where the concentration of ammonium hydroxide, reaction temperature, and the oxidizing agent were varied. All trials result in Mn-ferrite particles wit…