Materials Literature
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Stabilized cubic zirconia is a promising candidate material for use as an inert fuel matrix for 'burning' excess Pu in light-water nuclear reactors. Zirconia is also considered to be an excellent nuclear waste form for direct geological disposal. Both applications are based on zirconia's high solubility for actinides,…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Douglas A. Reinelt, Andrew M. Kraynik; Simple shearing flow of dry soap foams with tetrahedrally…
The first Ioffe-Regel crossover for vibrational plane waves (when wavelength and mean free path are comparable) has been investigated theoretically for models of vitreous silica $(v\ensuremath{-}{\mathrm{SiO}}_{2})$ constructed by molecular dynamics. The crossover is found to be from a state of weak scattering to one…
A phenomenological two-component polaron model, originally formulated to describe the temperature-dependent transport properties of La2/3Ca1/3MnO3(LCMO), has been applied to treat the resistivity and Hall effect of EuO and ZrTe5.
SiC nanocrystalline films on Si substrates deposited using advanced electron-cyclotron-resonance chemical-vapor deposition exhibit intense visible light emission at room temperature under laser excitation. Continuous-wave and time-resolved photoluminescence measurements for these SiC films were carried out at room tem…
Abstract The mechanical properties of films prepared from mixed acetic acid aqueous solutions of chitosan ( M w = 400,000; M w / M n = 3.8) and poly(ethylene oxide) (PEO) (viscosity average molecular weight of 200,000 or 600,000) were determined. A chitosan:PEO weight ratio of 10:2 improved the mechanical properties c…
Magnetically ordered Prussian blue analogues with the general formulation of M[Mn(CN)6] (M = V, Cr, Mn, Co, Ni) were made in aprotic media utilizing [MnIV(CN)6]2-. These analogs are valence-ambiguous, as they can be formulated as MII[MnIV(CN)6] or MIII[MnIII(CN)6]. The X-ray powder diffraction of each member of this f…
A thermally stable Cu/ZrN/Si contact system using a ZrN diffusion barrier of low resistivity was developed. In the contact system, the growth of an oriented ZrN(100) layer on Si(100), and subsequent growth of a Cu(110) layer on ZrN(100) were observed. The obtained contact system was fairly stable after annealing even…
Results of studies of static dielectric permittivity (\ensuremath{\varepsilon}) and nonlinear dielectric effect (NDE) in the isotropic phase of 4-n${\ensuremath{-}4}^{\ensuremath{'}}$-isothiocyanatobiphenyl $(n\mathrm{BT})$ homologous series from $n=2$ to $n=10$ exhibiting the isotropic-smectic E $(I\ensuremath{-}\mat…
Cobalt–ferrite nanoparticles have been synthesized in water-in-oil microemulsions (reversed micelles) with varying cation composition. The microenvironment provides a template effect that controls the size and particle shape. Transmission electron microscopy reveals that the particles are nanospheres with particle siz…
To avoid the harmful effects of metallic residues in poly(1,4-dioxan-2-one) (PPDO) for medical applications, the enzymatic polymerization of 1,4-dioxan-2-one (PDO) was carried out at 60 °C for 15 h with 5 wt % immobilized lipase CA. The lipase CA, derived from Candida antarctica, exhibited especially high catalytic ac…
Contour-vibration-mode Pb(Sb 1/2 Nb 1/2 )O 3 –Pb(Zr, Ti)O 3 [PSN–PZT] piezoelectric transformers with different ring/dot electrode area ratios were fabricated to the size of 27.5×27.5×2.5 mm 3 by cold isostatic pressing. The electrical properties and characteristic temperature rises caused by the vibration were measur…
This paper presents novel work on developing fiber optic micro-sensors and integrating them into soldiers’ uniforms. These fiber optic sensors can be used to sense various battlefield hazards in real-time, such as chemical and biological warfare threats, above-normal field temperatures, and other hazards. The develope…
Poly(phenylsilsesquioxane) (PPSQ) polymers that were obtained from different synthetic routes were comparatively studied. The polymers were characterized by infrared and solid-state 29Si NMR spectroscopies. According to the results of X-ray diffraction and thermogravimetric analyses, the materials richest in silanol s…
Silver nanocrystals (NCs) deposited on an Au (111) substrate have been investigated using scanning tunneling microscopy. The electron transport properties are presented for the particles as isolated NCs, in self-assembled 2D (see Figure) and 3D superlattices. The electronic behavior is found to vary markedly, the mono…
La 0.7 Sr 0.3 MnO 3 and CoFe2O4 samples have been prepared by a sol-gel process. A mixture of the two samples was annealed at 800 °C and the scanning electron micrograph shows large CoFe2O4 grains well surrounded by La0.7Sr0.3MnO3 grains. The powder x-ray diffraction patterns indicate no evidence of reaction between t…
ZnO thin film has been deposited on a sapphire (001) at a temperature of 400 °C using a pulsed laser deposition with oxygen pressures of 1, 20, 50, 200, 300, and 500 mTorr. As the oxygen pressure for the thin film deposition increases, the grain size of the films increases up to a certain point, but then the size decr…
Various single particle measuring techniques are briefly reviewed and the basic concepts of a new microsuperconducting quantum interference device technique are discussed. It allows measurements of the magnetization reversal of single nanometer-sized particles at low temperature. The influence of the measuring techniq…
The preparation of dilute alloy of GaSb and Mn, (Ga, Mn)Sb, with a few percent of Mn by molecular beam epitaxy and its magnetotransport properties are reported. Magnetotransport measurements show a pronounced anomalous Hall effect and negative magnetoresistance below 50 K. The results suggest that Mn atoms are incorpo…
We report the structural and magnetic properties of SmCo7−xCux, where x=0, 0.1, 0.2, 0.3, 0.4, 0.5, and 0.7. X-ray diffraction shows that these alloys from the disordered hexagonal TbCu7-type structure. For large values of x(x⩾0.8) the hexagonal TbCu7-type structure cannot be formed. X-ray diffraction on magnetically…