Materials Literature
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Abstract Single crystals of garnet Y 3 Al 5 O 12 (YAG): Co and Co, Si were grown by Czochralski method as materials for optoelectronic applications. Silicon doping is responsible for the change of the Co 3+ ions into Co 2+ in order to keep charge neutrality of the material and for a coloration of materials. Magnetizat…
The spin-orbit effect is at the heart of efforts to merge spintronics—where information is carried and stored by spin, rather than by charge—with semiconductor technology.
Composite scale of amorphous silica and calcium oxalate is very intractable; it imposes a significant fraction of scale management cost in sugar mill evaporators. This work evaluates silica and calcium oxalate composite fouling using dynamic fouling-loop experiments under different operating conditions with and withou…
Sodium intercalated manganese thiophosphate Na0.62Mn0.69PS3 powders have been synthesized by a two-step ion-exchange process. Dielectric measurements have been performed as a function of both temperature and frequency on the prepared samples in the 20–106 Hz frequency range over the 78–350 K temperature range by using…
Metal failure in many applications, such as ballistic impact, containment, shielding, metal forming, and crashworthiness, occurs while the material is in a three-dimensional state of stress. Many previous definitions of triaxiality use two invariants to define the relative stress state in a virtual element, leading to…
This paper investigated the resistivity and dielectric properties of manganese doped barium titanate sintered in pure nitrogen. The influence of variable doping concentration and Ba/Ti ratio on densification, microstructure, resistivity and dielectric properties was studied. A dielectric with permittivity of 1500 and…
We report on the investigation of electronic states in hydrogenated nanocrystalline silicon (nc-Si:H) thin films through the electronic transitions by photocurrent measurements. Higher photocurrent response has been observed above the bulk Si band gap of 1.05 eV in the nc-Si:H films with larger crystalline faction. We…
We have observed the nucleation and growth of the Cu2O surface oxide on a Cu(100) surface at 870 K using low energy electron microscopy. Nucleating on a surface exhibiting the (2×22)R45°-O overlayer, this phase caused the overall step morphology to change from long, mostly straight narrow-terraced step bunches to broa…
The reaction path for the synthesis of LaFeAsO and LaFeAsO1−xFy by solid state reaction was studied by in situ high temperature x-ray diffraction technique and differential thermal analysis in the temperature interval 100°C⩽T⩽1150°C. Starting with LaAs, Fe2O3, Fe, and LaF3 as precursors, the results show that the synt…
In this research, effect of ZnO nano-particles on structure, mechanical and electrical properties of PZT ceramics was investigated. X-ray diffraction result suggested that tetragonality of PZT decreased with increasing ZnO content. Density tended to increase with an addition of ZnO while grain size of the ceramics dec…
In the present work, samples of compositions SrBi 2 Nb 2 O 9 and SrBi 2 Nb 1.9 Mo 0.1 O 9 were prepared by solid state reaction method. X ray diffraction analysis reveals the formation of single phase perovskite structure. Although the perovskite structure of SBN is retained but slight change in the lattice parameters…
It is shown that current saturation in semiconducting carbon nanotubes is indistinguishable from metallic nanotubes if the carrier density is above a critical value determined by the bandgap and the optical phonon energy. This feature stems from the higher number of current-carrying states in the semiconducting tubes…
The electronic structure of the oxide semiconductor ZnO has been investigated using soft x-ray angle-resolved photoemission spectroscopy (ARPES). The obtained band dispersions within the kx−ky planes reflect the symmetry of the Brillouin zone and show no surface-state-derived flat bands. Band dispersions along the kz…
This paper presents the influence of Spartium junceum (SJ) fiber content, surface treatment and temperature on the water uptake of polypropylene/Spartium junceum fiber (PP/SJ) composites. Composites specimens were dried at 70°C to reach a constant weight and then were submerged in distilled water at different temperat…
Abstract Electronic structure and optical properties of BiSeI were investigated with ab initio calculations based on density‐functional theory (DFT). The full potential linearized augmented plane wave (FP‐LAPW) method was used with the generalized gradient approximation (GGA). The complex dielectric function and optic…
Lead zirconate, PbZrO 3 (PZ) and lead barium zirconate, (Pb 0.90 Ba 0.10 )ZrO 3 (PBZ), powders were prepared by a combustion technique under various calcination temperatures (600°C – 1000°C). (CO(NH 2 ) 2 ) was used as a fuel to reduce the reaction temperature. The crystalline structure of PZ and PBZ powders was analy…
By simulating spin transport through graphene nanoscale junctions, which have been fabricated recently, we show that the junction can conduct a spin-polarized current even without an external field. Conduction through the conduction subband results in an opposite type of spin filtering from conduction through the vale…
Time-dependent photoluminescence measurements of low-temperature-annealed Er-doped Si-rich SiO2 were conducted at sample temperatures 15–300 K. The erbium internal relaxation efficiency from the second (I411/2) to the first (I413/2) excited state upon luminescence-center-mediated Er3+ excitation is investigated. Despi…
In this study, the influences of Fe addition on phase formation and electrical properties of Ba(Ti 1 − x Fe x )O 3 with x = 0 to 0.02 were investigated. In addition, aging behavior of the ceramics was also investigated. The XRD analysis showed that the crystal structure of Ba(Ti 1 − x Fe x )O 3 changed from tetragonal…
One of the major expenses associated with recombinant peptide production is the use of chromatography in the isolation and purification stages of a bioprocess. Here we report a chromatography-free isolation and purification process for recombinant peptide expressed in Escherichia coli (E. coli). Initial peptide releas…