Materials Literature
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Boron solids exhibit a fascinating geometric and electronic structure. The properties of alpha-rhombohedral boron can be significantly changed by the addition of other atomic constituents. It is found that Pauling's bond valence principle plays an important role in designing boron-rich semiconductors. We have designed…
Microwave tunable dielectric properties of strained (001) SrTiO3 thin films epitaxially deposited on (110) DyScO3 substrates were studied for in-plane film orientations ([100], [010], [110], and [−110]). A significant in-plane anisotropy in dielectric constant and tuning was observed in these SrTiO3 films. The highest…
In this study, the heterogeneous uptake of gaseous nitric acid on dolomite, CaMg(CO3)2, and calcite, CaCO3, particles under dry conditions at 296 K was investigated. A Knudsen cell reactor was used to measure heterogeneous uptake coefficients for these reactions. Several different experiments were performed including…
First-principles theoretical investigations of the noncollinearity of atomic spin moments in manganese clusters have been carried out within a gradient-corrected density-functional approach. Our studies on ${\mathrm{Mn}}_{5}$ and ${\mathrm{Mn}}_{6}$ include investigation of both collinear and noncollinear arrangements…
This work is aimed at understanding the nature of the interactions between metal interconnects and nanoporous dielectrics in integrated circuits. Electrical testing of metal-insulator-semiconductor capacitors is used to assess Cu diffusion and charge injection in the dielectric in the presence of an electric field. We…
We develop a modified "two-state" model with Gaussian widths for the site energies of both ground and excited states, consistent with expectations for a disordered system. The thermodynamic properties of the system are analyzed in configuration space and found to bridge the gap between simple two-state models ("logari…
The electronic and vibrational properties of small diamondoids are systematically investigated using an ab initio molecular orbital method. The obtained formation energies, ionization potentials, and affinity energies as well as the HOMO-LUMO gaps of the concerned diamondoids all exhibit the polymantane-order-dependen…
The crystal structures of LaGaO 3, LaGa 0.9 Mg 0.1 O 2.95, and La 0.9 Sr 0.1 Ga 0.9 Mg 0.1 O 2.9 have been investigated by high-temperature neutron powder diffraction in order to clarify a mechanism for high oxide ion conduction properties in LaGaO 3 -based compounds. Parent phase LaGaO 3 crystallized in the orthorhom…
The dramatic field enhancement at the extremity of finite chains of strongly coupled gold nanoparticles illuminated under total internal reflection is investigated numerically. We demonstrate that high enhancement factors can be achieved by exploiting the in-plane forward scattering of the particles, with geometries a…
Using previously proposed C(BH)2(CH)2 (16, 17) and C(CH)2B2 (22) systems with a central planar tetracoordinate carbon (ptC) atom linking two three-membered rings as building blocks, a series of stable structures containing two and three ptC centers within a molecule have been designed and computationally studied with…
We compared the newly developed heat resistant magnesium alloy with conventional ones by Thixomolding® and aluminum alloy by die casting. Tensile properties at elevated temperatures of AXEJ6310 were equal to those of ADC12. In particular, elongation tendency of AXEJ6310 at higher temperature was better than those of t…
Anhydrous magnesium chloride (MgCl2), the dehydration product from bischofite (MgCl2•6H2O) and as industrial raw material for preparation of electrolytic magnesium, is now the most advanced and perfect technological process. For long, the detailed dehydration process was not known due to its dehydration complexity and…
The holmium-doped 200-nm-thick BaTiO3 (BT) thin films were prepared by rf magnetron sputtering. The effects of postannealing temperature and dopant concentration on microstructure and electrical properties were studied. Compositions of thin films studied are BT1 (Ba∕Ti=0.8543), BT (Ba∕Ti=0.9681), BT–0.05Ho, BT–1.1Ho,…
We study the transient behaviors in focusing a point source with a metamaterial lens (epsilon = mu = -1 + delta). We find the time evolutions of image formation are dictated by two relaxation mechanisms, namely, surface wave transport and absorption, determined, respectively, by Re(delta) and Im(delta). We show that i…
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Acoustic emission (AE) method was used to investigate the electric-field-induced-phase transition in the well-known relaxor Pb(Mg1∕3Nb2∕3)O3 (PMN). We show that in the field cooling process the induced-phase transition is accompanied by an AE signal, which reflects relaxation of the strong stress, associated with aris…
An appropriate temperature (150-200°C) bending process has been developed for AZ31 and AM30 magnesium alloy tubes, and the optimum bending process parameters were obtained using a Design of Experiments (DOE) method. The development of this process was one of the key factors for use of magnesium tubes in automotive com…
The electronic properties of boron-doped multiwall carbon nanotubes (MWNTs) have been studied using static magnetization and electron spin resonance. A relatively strong ferromagnetic signal has been identified in the dc magnetization response that shows the occurrence of ferromagnetism, coexisting with the orbital an…
The thermotropic smectic phases of amphiphilic 2-(trans-4-n-alkylcyclohexyl)-propane-1,3-diols were investigated by means of small- and wide-angle x-ray scattering and values of the smectic (bi-)layer spacing, the orientational order parameters P(2) and P(4), the orientational distribution function as well as the intr…
The domain structure of furnace-cooled (FC) and post-annealed (PA) Fe–xat.% Ga (x=12, 20, and 25) crystals has been investigated by magnetic force microscopy. For both FC and PA Fe–12at.% Ga, the domains were found to be well-aligned and oriented along the [100] direction. For Fe–20at.% Ga, although a preferred [100]…