Materials Literature
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${\mathrm{Mn}}_{5}{\mathrm{Si}}_{3}{\mathrm{C}}_{x}$ films exhibit antiferromagnetic or ferromagnetic behavior depending on the carbon doping level $x$. We report a detailed electronic-transport study of films prepared with different $x$. All films exhibit metallic behavior of the temperature-dependent resistivity $\e…
Nanoparticles of certain materials can respond structurally to changes in their surface environments. We have previously shown that methanol, water adsorption, and aggregation−disaggregation can change the structure of 3 nm diameter zinc sulfide (ZnS). However, in prior observations of water-driven structure change, a…
A commercial Na-MOR was exchanged to various extents with cobalt. The sodium and cobalt contents were determined by atomic absorption. Samples were characterized by UV−vis and by FTIR. The FTIR results with CO show that Co-MOR heated in O 2 at 793 K and evacuated at the same temperature contained isolated Co 2+ (86 to…
Nanoporous VSB-5 nickel phosphate molecular sieves with relatively well controllable sizes and morphology of microspheres assembled from nanorods were synthesized at 140 degrees C over a short time in the presence of hexamethylenetetramine (HMT) by a facile hydrothermal method. The pH value, reaction time, and ratio o…
Three-dimensional, mesoporous-cage-type, GaSBA-1 materials with different n(Si)/n(Ga) ratios have been successfully prepared for the first time by using a low hydrochloric acid to silicon (n(HCl)/n(Si)) molar ratio in the synthesis gel by templating with cetyltriethylammonium bromide as the structure-directing agent i…
An influence of hydrostatic pressure on phase transition temperature ${T}_{C}$, spontaneous magnetization ${M}_{0}$, coercive field ${H}_{C}$, and remanent magnetization ${M}_{R}$, has been investigated for the parent perovskite ${\mathrm{SrRuO}}_{3}$ and substituted ruthenates with decreased $({\mathrm{La}}_{0.2}{\ma…
We demonstrate, both theoretically and experimentally, that special spectral-purity-enhancing multilayer mirror systems can be designed and fabricated to substantially reduce the level of out-of-band radiation expected in an extreme ultraviolet lithographic tool. A first proof of principle of applying such spectral-pu…
Molecular dynamics (MD) simulations of diffusion couple tests were conducted between carbon (diamond/graphite) and iron at three different temperatures (300, 800 and 1600 K) and contact times (0, 40 and 80 ps) to investigate the chemical interaction between carbon and iron. Two different carbon structures, namely, dia…
Using first-principles density functional calculations with AlH 3 , KMgH 3 , LiMgH 3 , NaBeH 3 , NaMgH 3 , and RbMgH 3 as model systems we have analyzed the band structure of hydrides. It is shown that hydrides can possess the features of semiconductors with n - and/or p -type electrical conductivity. We have found th…
A unique series of halogenidoiron(III) complexes of the open-chain tetrapyrrolic ligand 2,2'-bidipyrrin (bpd) ([FeX(bdp)] X=F, Cl, Br, I) was prepared from simple pyrrolic and bipyrrolic precursors and iron chloride by a one-pot condensation/metalation strategy, followed by salt metathesis with CsF, LiBr, or NaI. Crys…
The nature of $\mathrm{O}\text{\ensuremath{-}}\mathrm{H}$ wag vibrations in the cubic proton conducting perovskite-type oxides, ${\mathrm{BaIn}}_{x}{\mathrm{Zr}}_{1\ensuremath{-}x}{\mathrm{O}}_{3\ensuremath{-}x∕2}$ $(x=0.20--0.75)$ have been investigated by means of inelastic neutron scattering. Our spectroscopic resu…
Within continuum dislocation theory the plastic deformation of bicrystals under plane strain constrained shear is considered. An analytical solution is found in the symmetric case (for twins) which exhibits the energetic and dissipative thresholds for dislocation nucleation, the Bauschinger translational work hardenin…
One of the primary factors affecting the failure in high strength silicon carbide (SiC)–silicon nitride (Si 3 N 4 ) nanocomposites is the placement of spherical nano-sized SiC particles in micro-sized Si 3 N 4 grains. In order to analyze this issue, the cohesive finite element method (CFEM) based dynamic fracture anal…
Ultrasonic velocity measurements are used to examine the elastic properties of the magnetoelectric compound $\mathrm{Cu}\mathrm{Fe}{\mathrm{O}}_{2}$ in the vicinity of the magnetic and structural phase transitions near $14\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. Strong softening of modes related to ${C}_{66}$ occurs at…
X-ray resonant scattering has been used to measure the magnetic order of the Dy ions below $40\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ in multiferroic $\mathrm{Dy}{\mathrm{Mn}}_{2}{\mathrm{O}}_{5}$. The magnetic order has a complex behavior. There are several different ordering wave vectors, both incommensurate and comm…
OBJECTIVE: A novel nanocomposite has recently been developed based on polyhedral oligomeric silsesquioxane attached by direct reaction onto a urethane segment, as a potential vascular graft material; its trade name is UCL-Nano. The UCL-Nano has been demonstrated to have similar viscoelastic properties to the walls of…
Scanning tunneling microscopy and spectroscopy have been used to investigate the electronic structure of non-stoichiometric ${\mathrm{V}}_{2}{\mathrm{O}}_{3}$ islands with a vanadyl termination grown on Au(111). The spectroscopic measurements reveal the correlation gap of bulk ${\mathrm{V}}_{2}{\mathrm{O}}_{3}$ that v…
We report the growth of ultralong β-Ga(2)O(3) nanowires and nanobelts on silicon substrates using a vapor phase transport method. The growth was carried out in a tube furnace, with gallium metal serving as the gallium source. The nanowires and nanobelts can grow to lengths of hundreds of nanometers and even millimeter…
Two-dimensional nanostructures have a variety of applications due to their large surface areas. In this study, the authors present a simple and convenient method to realize two-dimensional NiO nanowalls by thermal treatment of a Ni thin film deposited by sputtering onto a stainless steel substrate. The substrate surfa…
Density functional theory is used to study atomic oxygen absorption into subsurfaces of various platinum-based alloys to investigate the effects of alloyed metals on the thermodynamics and kinetics of this process. The results show that alloying Pt with Ir and Rh increases the absorption energy barrier compared with p…