Materials Literature
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Abstract The structure and defect formation energies of the K‐doped CuN 3 were studied using density functional theory within the generalized gradient approximation. The results show that the K‐doping breaks the azide symmetry and causes asymmetric atomic displacement. As the K‐doping level increases, the band gap of…
THIS PAPER PRESENTS A DETAILED INVESTIGATION OF ENERGY ABSORPTION CHARACTERISTICS OF THIN SINGLE AS WELL AS LAYERED IN-CONTACT ALUMINUM TARGET PLATES OF DIFFERENT THICKNESSES IMPACTED BY BLUNT, OGIVE AND HEMISPHERICAL NOSED STEEL PROJECTILES. INFLUENCE OF VARIOUS PARAMETERSA AFFECTING THE ENERGY ABSORPTION CAPACITY OF…
In the oil field, due to the extensive use of water injection for oil displacement and pressure maintenance, many reservoirs experience the problem of scale deposition when injection water begins to break through. Experience in the oil industry has indicated that many oil wells have suffered flow restriction because o…
The use of different materials as metals, wood and other modern materials like composites, require a previous evaluation of its performance under corrosion, creep, tension, compression, bending and fatigue. In general, these requirements lead to a few number of materials to choose during the project of one component,…
Este trabalho teve como objetivo avaliar as propriedades de chapas de madeira aglomerada fabricadas com partículas de Eucalyptus urophylla (massa específica = 0,55 g/cm³) e de Schizolobium amazonicum (Paricá) (massa específica = 0,30 g/cm³). Foram confeccionadas chapas com cinco proporções de madeira e dois tipos de p…
This contribution deals with a few topics closely related to the superconductivity in the heavily boron-doped diamond which are, in our opinion, not properly treated in the current literature. Attention is paid especially to the classification of metallic and insulating state, selection of pairing mechanism, limits of…
Density functional theory calculations are performed to study the structural, electronic, and magnetic properties of hexagonal NiAs type and cubic zinc blende type CrSe structures and interface of zinc blende CrSe with ZnSe(001). We observe that the local density approximation to the exchange correlation energy leads…
Natural cellulose was treated by an atmospheric DBD plasma. The solubility of cellulose in a diluted alkaline solution after the plasma treatment was investigated. The properties were characterized by X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscop…
A natural sample of anorthoclase of composition Na0.63 K0.27Ca0.10 Al1.10 Si2.90O8 (Ab63 Or27An10) was treated at T = 950°C for one week, and then investigated by single-crystal X-ray diffraction in situ at high pressure using a diamond-anvil cell. After the thermal treatment, the unit-cell parameters at room pressure…
The dielectric properties of polymer composites on the basis of polyethylene and polypropylene with TlInS 2 semiconductor filler are investigated. It is shown that the changes in these properties that were observed are caused by polarization processes occurring on the polymer-filler interface.
Catalysts with the formula of LaCo(1+x)O(3+δ), where 0 ≤ x ≤ 1, were studied for oxidation of CO and C2H6 in a synthetic exhaust gas, comprising 6.0 % CO and 0.2 % C2H6 in Ar. Ethane was selected as a model for hydrocarbons in the exhaust gas. The performance of catalysts is correlated to their properties, particularl…
Microstructures associated with the ferroelectric (FE) properties in (1-x)BiFeO 3 -xBaTiO 3 were investigated mainly by a transmission electron microscopy. It was found that large FE domains in BiFeO 3 changed into complicated FE microdomains with the 20–30 nm width in the x = 0.25 compound. The directions of the spon…
The present investigation is aimed at processing a composite using fly ash, jute with epoxy (binder) and to study its weathering behaviour on mechanical properties such as flexural strength. The fracture surfaces of the specimen are examined under scanning electron microscope. From the study, it appears that fiber pul…
Abstract For several years, Cr IV compounds were used as effective and inexpensive corrosion inhibitors. Studies showed that these materials were toxic and carcinogenic. This has led to extensive research to develop alternative inhibitors. Organo‐silicate hybrid coatings appeared as an effective technique for forming…
Design of chemically modified oligonucleotides for regulation of gene expression has attracted considerable attention over the past decades. One actively pursued approach involves antisense or antigene oligonucleotide constructs carrying reactive groups, many of these based on transition metal complexes. The complexes…
The incorporation of Te into the crystal lattice, when it is used as an n-type dopant for GaAs grown by metalorganic vapor phase epitaxy, is studied. For this purpose, several growth temperatures, total pressures, growth rates, and substrate misorientations have been analyzed, from which it is concluded that depending…
We describe the structure of luminescence spectrum in the visible region in nano-ZnO in colloidal and thin film forms under weak confinement regime by modeling the transition from excited state energy levels of excitons to their ground state. Measurements on nanocrystallites indicate the presence of luminescence due t…
Structural, energetic and thermodynamic properties of CoAl2O4 and Co2AlO4 spinels are investigated using the density functional theory formalism. Thermal effects are incorporated by means of a non-empirical quasi-harmonic Debye-like model that allows us to study the influence of temperature on the relative stability o…
We investigated the electrical properties of a Pt/Nb-doped SrTiO 3 (Nb:STO) single crystal Schottky junction. The junction exhibited highly rectifying current–voltage ( I – V ) characteristics under a DC bias. To make a junction profile, the capacitance–voltage ( C – V ) curve for reverse bias was measured – the curve…
Without experimental or predicted literature crystal structures for succinonitrile at low temperature, structure solution was attempted from powder diffraction data taken at 173 and 90 K from a solid sample. Its room-temperature plastic-crystal state makes production of a sample with good particle statistics and rando…