Materials Literature
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Strontium barium niobate has the tungsten-bronze structure with a tetragonal unit cell, and it exhibits negative thermal expansion along the c axis between −120°C and room temperature while having a positive thermal expansion along the a axis for the same temperature range. At higher temperatures, close to the Curie t…
Abstract The NR/BR blend compound formulations for tire sidewall applications contain a set of stabilizers added to prevent degradation mainly due to oxygen, ozone, and heat. 6PPD is the most effective and widely used antiozonant in tire compounds, but is a highly staining material causing a surface discoloration of t…
The formation of rings composed of uniformly sized triple-walled carbon nanotubes has been demonstrated and characterized by high resolution transmission electron microscopy. These rings are found in the products from acetylene decomposition on Fe∕MgO catalyst in a fluidized bed. This finding expands the libratory of…
The electro-optical modulation effect of a (10,0) boron nitride nanotube is investigated by first-principles, density functional theory calculations. The optical properties of boron nitride nanotubes can be tuned through perturbation by a transverse electric field. Large optical anisotropy in variations of the absorpt…
Monolithic titania exhibiting a hierarchical, bimodal meso‐macroporosity has been prepared through a template free sol‐gel synthesis route. The macropore diameter can be controllably varied in the range 0.4–4 µm still maintaining a narrow pore size distribution. The macropores form as a consequence of parallel gelatio…
Absorption spectra of trilayer rhombohedral graphite are studied with the tight-binding model. The interlayer interactions cause a tiny energy gap and band-edge states in electronic structures. The band-edge states exhibit logarithmic divergences and discontinuities in the density of states. The frequencies of the abs…
The structure of high-velocity screw dislocations in Cu was investigated using molecular dynamics. We observed that the dissociation width of the dislocation into its partials is velocity dependent and identified two main regimes at low and high velocities with respect to the shear wave velocity. In the first regime t…
The authors have experimentally verified that the light emission from conjugated polymers can be enhanced through the use of surface plasmon coupling layers. Carrier dynamics of such plasmon-enhanced organic light emitters were studied and a recombination rate increase due to surface plasmon polaritons was experimenta…
Foamability and foam stability of diglycerol fatty acid esters (designated as Qn‐D, where, n represents the carbon number in the alkyl chain of the amphiphile) were studied in different nonaqueous solvents, namely, liquid paraffin (LP70), squalane, squalene, and glycerol tris (2‐ethylhexanoic) ester (TIO) at 25°C. Fiv…
Vaithianathan et al. [Appl. Phys. Lett. 88, 112103 (2006)] measured x-ray absorption near-edge structure (XANES) of As-doped ZnO and analyzed it as evidence for AsO acceptors. However, upon carrying out first principles calculations, we found that the simulated XANES spectrum for AsO is very different from that observ…
Nanowires of the organometallic semiconductor CuTCNQ were grown from TCNQ vapor in 250nm diameter vias of a Cu back end-of-line process. Corresponding prototypes of cross-point Cu∕CuTCNQ nanowire/Al memories exhibited nonvolatile bistable conductive switching for several ten write-erase cycles with switching currents…
The effects of A-site cational size mismatch (A-site disorder) on the stability of charge-ordered states and phase separated phase in a series of manganites with constant A-site ionic average radii ⟨rA⟩=1.18Å but different A-site ionic size mismatches σ2 are experimentally investigated. It is revealed that the charge/…
Abstract The Raman spectra of DyPO 4 , under variable hydrostatic pressure at room‐ and low‐temperature (110 K), have been studied. Crossing, with increasing pressure, of two modes in the frequency range of the internal‐external border, is observed and discussed. At low temperature, the pressure dependence of the thre…
The principal and innovative concept of this research is the replacement of piezoresistors in the current piezoresistive pressure sensors with carbon fibers. The piezoresistive characteristics of carbon fibers can play the same role as piezoresistors in current pressure sensors. The main structure of pressure sensors…
The authors have grown strain relaxed epitaxial template of a rare-earth scandate, PrScO3, on miscut (001) SrTiO3 and (001) (LaAlO3)0.3–(Sr2AlTaO3)0.7 substrates by pulsed laser deposition of PrScO3 buffer layers followed by postannealing and overlayer growth. X-ray diffraction exhibits that the PrScO3 is a single dom…
Polymorphism of substances under high pressures is observed and used to obtain materials with new physical properties. Here the authors present experimental results revealing phase transitions and structure of liquid tin at high pressure under metastable conditions using x-ray absorption spectroscopy and x-ray diffrac…
Abstract The final properties of the composites materials are strongly dependent on the residual aspect ratio, orientation, and distribution of the fibers, which are determined by the processing conditions. Present work is a systematic study of the influence of natural fiber concentration on its damage during all the…
The conduction pathways in metal-halide doped silver, lithium, and sodium diborate glasses have been examined by bond valence analysis of reverse Monte Carlo (RMC) produced structural models of the glasses. Although all glass compositions have basically the same short-range structure of the boron-oxygen network, it is…
The molecular structure of the interphase formed by curing a model adhesive system consisting of the diglycidyl ether of bisphenol-A (DGEBA) and dicyandiamide (DDA) against mechanically polished aluminum and electrogalvanized steel (EGS) substrates was determined using reflection–absorption infrared spectroscopy (RAIR…
We investigate the electronic structure of the transition-metal oxide YVO3 by a hybrid first-principles scheme. The density-functional theory with the local-density-approximation by using the local muffin-tin orbital basis is applied to derive the whole band structure. The electron degrees of freedom far from the Ferm…