Materials Literature
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Microwave resonators made from high-temperature superconducting (HTS) films are becoming increasingly commercially competitive in the market of modern communication technologies. However, unlike normal metals, the HTS device performance suffers from intrinsically nonlinear electrodynamics, resulting in harmonic genera…
This letter reports the experimental in-plane thermal conductivity of microfabricated, free-standing, single-crystal silicon thin films with periodically arranged through-film micropores. The experimental data suggest that strong size effects exist even in micro-sized porous silicon structures, particularly at low tem…
Zinc oxide (ZnO) nanobelts synthesized by thermal evaporation have been ion implanted with 30 keV Mn+ ions. Both transmission electron microscopy and photoluminescence investigations show highly defective material directly after the implantation process. Upon annealing to 800 °C, the implanted Mn remains in the ZnO na…
The photothermal radiometric technique is used to measure the thermal properties of alumina ceramic materials (96% Al2O3/3% SiO2/0.9% MgO) treated by applying high temperature and high pressure, a process known as ASPRO conversion technology. Alumina ceramics subjected to ASPRO treatment have shown much higher thermal…
Abstract Gelatin, a low cost biopolymer was successfully used as a porogen to form microporous silica in the presence of formic acid as a cosolvent.
Abstract Isopolyoxomolybdates exhibited high selectivities for the industrially useful products (cyclohexene oxide and 2-cyclohexen-1-ol) catalyzing effectively the reaction of initial product cyclohexenyl hydroperoxide with cyclohexene in the oxidation of cyclohexene by molecular oxygen.
Abstract In this study, effect of MAPE (maleic anhydride polyethylene) as the compatibilizer on the mechanical properties of wood-flour polyethylene composites has been investigated by using Dynamic Mechanical Analysis (DMA). Composites were made at 25 % and 50 % by weight fiber contents and 1 % and 2 % compatibilizer…
We developed a finite-element micromagnetic algorithm to study the magnetic properties of a Sm(Co,Fe,Cu,Zr)z magnet. The cellular microstructure, consisting of a 2:17-type matrix and 1:5-type cell boundaries, is built according to the experimental results. Calculated results show a strong influence of microstructural…
Pr and Co doped ZnO bicrystals with various types of grain boundaries were fabricated to investigate their current–voltage characteristics. In addition, their grain boundary structures and chemical compositions were investigated using high-resolution transmission electron microscopy and energy-dispersive x-ray spectro…
An extended x-ray absorption fine structure technique has been employed to probe the average local structure around Mn impurity atoms in (In,Mn)As thin films prepared by organometallic vapor phase epitaxy. These films show ferromagnetism above room temperature. As the concentration of Mn increases, the average local e…
〈112〉 grain-oriented 0.7Pb(Mg1/3Nb2/3)O3–0.3PbTiO3 (PMN–0.3PT) piezoelectric ceramics with a degree of orientation of 0.35 have been produced from melt by a directional solidification method. The dielectric, ferroelectric, and piezoelectric properties were investigated, e.g., εrt∼4800, tan δ<0.6%, d33∼1500–1600…
Phonon heat transport based on the Boltzmann transport equation (BTE) in a free standing, bent duct with characteristic dimension down to the nanoscale is investigated through the lattice Boltzmann (LB) method. Both the thermal excited transverse and longitudinal phonons are considered. The collision term in BTE is ap…
The electrical conductivity of mesoscopic cubic cerium oxide crystals with space charge layers along their external boundaries has been calculated as a function of grain size. The equilibrium distribution of electronic and ionic charge carriers in this mixed conductor were obtained by numerical solution of the three-d…
Structure, magnetic, and transport properties of the compounds Bi0.5Ca0.5Mn1−xCrxO3 (BCMCO) with 0⩽x⩽0.15 have been experimentally investigated. The substitution of Cr3+ ion for Mn3+ ion suppresses the charge-ordering (CO) state obviously, leading to a gradual reduction of the CO transition temperature (TCO). In contr…
To assess the relevance of current crowding to electromigration-induced mass transport, a test structure was designed to structurally induce and accelerate current crowding in Cu damascene lines. Electromigration experiments and quantitative finite element analysis demonstrate how current crowding can substantially en…
We report the subthreshold characteristics of ballistic carbon nanotube field effect transistors (CNTFETs) showing the complex band structure effect. The tunneling of carriers from source to drain through a looped complex band structure increases the subthreshold drain current, reducing the on–off current ratio. We fi…
The polarized Raman spectra of a series of isostructural vanadate/phosphate compounds of the form: Tb(V1−xPx)O4 with 0⩽x⩽0.75 have been investigated at room temperature. While the observed Raman spectra are generally consistent with group theory predictions for a body-centered tetragonal crystal structure (D4h19), due…
Molecular dynamics simulations show significant differences in the deformation mechanisms of nanocrystalline nickel with low- and high-angle boundaries. For the case studied with average grain size of 12 nm, low-angle boundaries present enhanced dislocation activity and reduced strength with respect to high-angle boun…
Phase diagrams of mixtures of colloidal hard spheres with hard discs are calculated by means of the free-volume theory. The free-volume fraction available to the discs is determined from scaled-particle theory. The calculations show that depletion induced phase separation should occur at low disc concentrations in sys…
In order to fabricate an electronic device, we have optimized growth conditions of VO2 films on amorphous SiO2/Si structure substrates by pulsed laser deposition. The phase of VO2 films observed consisted of multiphases such as VO2, V2O5, and V2O3. The correlation between phase changes and growth conditions of VO2 fil…