Materials Literature
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Low temperature solid state reactions were used to synthesize (Bi2)m×(Bi2Te3)n phases that consist of ordered superstructures of Bi double layers and Bi2Te3 blocks. Phase analysis using X-ray powder diffraction confirms that the (Bi2)m×(Bi2Te3)n series is infinitely adaptive for BixTe1-x compositions between x = 0.44…
Non-isothermal crystallization and subsequent melting of biodegradable poly(bu-tylene succinate-co-terephthalate) copolyesters with different butylene terephtha-late contents were investigated by differential scanning calorimetry measurements. Differential scanning calorimetry crystallization curves revealed that buty…
The article deals with the application of fuzzy probabilistic analysis in the verification of the reliability of design of steel members according to the concepts of standards Eurocode 3 and EN1990, based on the theory of limit states. Histograms and statistical characteristics of material and geometric properties mon…
MgB 2 /Fe tapes with various forms of mono- and co-doped C sources were prepared by an in-situ powder-in-tube (PIT) method to study the effect of different C sources on the transport critical current density J c behavior of MgB 2 . A remarkable J c improvement at 4.2 K under higher fields and a significant increase in…
Eurofer-97 steel has been subjected to isochronal annealing treatments and studied by Mossbauer spectroscopy to understand the evolution of the ferromagnetic phases and to look for the possible retention of austenitic phase at room temperature. This Mossbauer study elucidates the retention of austenitic phase in addit…
In this paper we have shown the doping effects of elements Y, F and Sb in place of RE (rare earth elements), O and As respectively in 1111-ferropnictides. We study the behavior of upper critical field and superconducting transition temperatures as a function of doping. In Ce and La based compounds maximum upper critic…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Simina Dreve, Iren Kacso, Adriana Popa, Oana Raita, A. Bende, Gh. Borodi, I. Bratu; Chitosan-base…
Atualmente, so produzidas no Brasil mais de 12 milhes de unidades de garrafas PET por dia. As garrafas PET ps-consumo correspondem a cerca de 1,0% da produo dos resduos slidos urbanos. Neste trabalho, estuda-se o reaproveitamento de garrafas PET como matria-prima para produo de nanomateriais. Amostras de garrafas PET…
At present, CuInSe2 (referred to as CIS) semiconductor has become one of the hot points in solar cell field at home and abroad for its excellent performances, such as direct bandgap, high light absorption coefficient, high photoelectric conversion efficiency and long-term stability. In this paper, the CIS bulk materia…
Foaming moulding process, cellular structure and dielectric property of polyimide (PI) foam which has been prepared by esterification method were discussed. Research results showed that the cell of prepared PI foam was well-distributed and its pore volume and porosity were bigger by microwave heating when methanol was…
Variation of thickness of specimens of single crystalline silicon Si(100) prepared by scribing of the water of 100 mm diameter to parts of smaller size under atmospheric conditions is studied. It is shown that the thickness of specimens having small surface (∼1 cm 2 ) decreases after scribing by 0.8–1.0% (with the err…
In this work, two-fold materials are synthesized and characterized. The materials are designed for applications in both hydrogen gross purification and hydrogen compression. The synthesis unifies steps of the different unitary process to lower costs. (La,Ce,Nd, Pr)Ni5 intermetallics are obtained by mechanical alloying…
We study micro-Raman spectroscopy in free-standing single GaN nanocolumns with 0.45-2.1 μm diameters, which are synthesized by rf-plasma-assisted molecular beam epitaxy. We clearly observe the breakdown of the polarization selection rule of Raman spectra from E2H phonon, when the diameter of nanocolumn is thinner than…
The smectic C phase of a family of calamitic rod-like chiral mesogens was investigated using all-atom molecular dynamics simulation. The studied molecules differ from each other by the orientation of an ester moiety inside the rigid core, the nature of an outboard dipole and the length of the external alkyl chains. No…
Superconducting Bi2Sr2Ca1−xYxCu2O8 ceramics samples have been prepared by Sol-Gel methods using citrate process. The influences of the conditions of preparation of oxide powder compound on structural and superconducting properties have been investigated by X ray diffraction (XRD), Scanning Electron Microscopy (SEM) eq…
The selective catalytic reduction (SCR) system is a highly-effective aftertreatment device for NOx reduction of diesel engines. Generally, the ammonia ( $NH_3$ ) was generated from reaction mechanism of SCR in the SCR system using the liquid urea as the reluctant. Therefore, the precise urea dosing control is a very i…
Boron-doped (p-type) μc-Si:H thin film window layers are widely used in silicon thin film solar cell fabrication due to their low optical absorption and high doping efficiency compared with their amorphous counterparts. In this paper, the layer-by-layer method is investigated to fabricate high-quality thin p layers (<…
Lithium (Li)-ion batteries will be important to future generations for use as clean energy-storage devices. However, the surface chemical reaction mechanism of the electrode has not been revealed to date. In this study, surface observation and chemical species mapping of cathode material for the Li-ion batteries were…
We study the Ruderman-Kittel-Katsuya-Yoshida (RKKY) interactions in graphene controlling the gate voltage and applying nonmagnetic disorder. It is found that oscillations of the RKKY interactions in undoped graphene are characterized by the interference of two neighbor Dirac nodes K and K′ in the first Brillouin zone…
The superconducting property of Zr55Cu(30-X)Al10Ni5NbX alloys prepared by arc melting and liquid quenching methods was investigated by magnetic susceptibility measurements. The crystalline alloys with X = 0∼25 at.% prepared by arc melting method exhibited superconductivity with maximum Tc,on of 10.1 K. The alloys (X =…