Materials Literature
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In the present work a monocrystalline Cu-13.5Al-4Ni (wt.%) alloy with shape memory effect (SME) submitted to thermal cycling inside the critical range was investigated in terms of number of cycles and resulting structural changes. Attention was paid to the structural changes associated with reversible β1↔γ’1 martensit…
This paper summarizes the processing, morphology and mechanical properties of PP/PCABS blend produced by a non-conventional injection moulding technique: shear controlled orientation in injection moulding, SCORIM. This technique consists on the in-mould shear manipulation of the melt during the solidification phase by…
We report on the magnetotransport properties of Co2Cr0.6Fe0.4Al mixed with insulating Al2O3. The powder compacts show a maximum magnetoresistance of 88% at a saturation moment of 0.125T at 295K. Different explanations for the reversible mechanism will be discussed, such as tunneling between contiguous ferromagnetic gr…
The crystal structures of divalent metal salts of trifluoromethyl sulfonic acid ("trifluoromethyl sulfonates") M(SO(3)CF(3))(2) (M = Mg, Ca, Ba, Zn, Cu) were determined from high-resolution X-ray powder diffraction data. Magnesium, calcium and zinc trifluoromethyl sulfonate crystallize in the rhombohedral space group…
In the present work, properties of Dy 3+ ‐doped chalcogenide glasses as a stoichiometric formula of (0.9− x )GeSe 2 – x AsSe 3/2 –0.1GaSe 3/2 ( x =0.1, 0.2, 0.3, 0.4, 0.5, 0.6) were investigated as a comparison with the previously studied Ge–Ga–Se system. Property measurements include differential thermal analysis, de…
We have studied the synthesis and sintering of BaTiO3 (BTO) nanometric powders produced by Pechini technique. A laser sintering procedure was applied to the BTO and its major advantage was the quickness of the processing. We have used the radiation of a CO2 laser (CW – 100 W) as the heating source. A linear rate of ir…
A hard axis hysteresis loop shift from the origin has been observed in the exchange biased $\mathrm{Mn}\mathrm{Pt}∕\mathrm{Ni}\mathrm{Fe}$. A model that accounts for the hard axis hysteresis loop shift is proposed. For the correct description of the experimental results, a misalignment between the easy axis of ferroma…
Radioactivity concentrations of concrete building block samples made and used in Jos, Nigeria, were determined using a gamma ray spectrometry method. The mean values of the radioactivity concentrations were calculated as 66, 126 and 589 Bq kg(-1) for (226)Ra, (232)Th and (40)K, respectively. The radium equivalent acti…
An analysis is provided of the x-ray photoelectron spectroscopy (XPS) intensities measured in the National Physical Laboratory (NPL) XPS database for 46 solid elements. This present analysis does not change our previous conclusions concerning the excellent correlation between experimental intensities, following deconv…
Silver nanoparticles were simply prepared by spray pyrolysis of aqueous solutions of AgNO 3 , and dextran or Poly (vinylalcohol) (PVA) without any reducing agent. Monodisperse particles well-organized in polymer matrix were obtained above a certain critical ratio of polymer to silver nitrate, usually around 1, and bel…
The dielectric properties, including the DC breakdown strength, of 1 mol% Nb 5+ ‐doped BaTiO 3 ceramics with different quantities of excess TiO 2 have been investigated. The breakdown strength was found to decrease with increasing TiO 2 content, but could not be readily explained by relative density and grain size eff…
This paper studies a tungsten cold field emitter throughout its life cycle. The field emission properties and corresponding tungsten emitter evolution throughout its life cycle fall into three distinct regions which are discussed. It was found that adsorbate dynamics affect field emission current stability significant…
The crystal structures of 222- and 221-polybasite [(Ag,Cu)(16)(Sb,As)(2)S(11)] crystals have been solved and refined by means of X-ray diffraction data (collected at 100 and 120 K, respectively) from twinned crystals. Both structures consist of the stacking of [(Ag,Cu)(6)Sb(2)S(7)](2-) and [Ag(9)CuS(4)](2+) module lay…
The deposition and characterization of n-type Bi2Te3 and p-type Sb2Te3 semiconductor films are reported. The films were deposited by thermal co-evaporation on a 25 µm thick polyimide (kapton) substrate. The co-evaporation method is inexpensive, simple, and reliable, when compared to other techniques that need longer t…
Half-Heusler compounds ErPdX (X=Sb and Bi) were prepared by a spark plasma sintering technique. Their thermoelectric properties at high temperature and thermophysical properties at room temperature were measured. The electrical resistivity ρ and thermoelectric power S of ErPdSb are larger than those of ErPdBi, and bot…
Plasma-generated silicon nanocrystals have been selectively trapped on a cooled substrate to yield nanocrystalline films. We here present experimental evidence that the contribution of positively charged nanocrystals largely dominates the film deposition. As a direct application, we illustrate how the use of a simple…
We report on a polarization-insensitive liquid crystal (LC) Fresnel lens with the centrosymmetry of dynamic focusing in an orthogonally alternating hybrid configuration. The polarization-insensitive Fresnel lens having such successive orthogonal hybrid alignment in two adjacent zones was fabricated using a single-mask…
Cr 3 + , Eu2+, and Dy3+ codoped Sr4Al14O25 has been synthesized by solid-state reaction. Long persistent phosphorescence in red of Cr3+ and in blue of Eu2+ has been observed in this system with persistence times of over 2h for the red and 10h for the blue. Red phosphorescence is performed through persistent energy tra…
In the framework of a general Landau free energy function, which is used in conventional ferroelectrics, we investigate the ferroelectric and magnetic properties of multiferroic epitaxial BiFeO3 thin films. It is shown that the properties of BiFeO3 thin films, such as lattice parameter, polarization, and magnetization…
The characteristics of an acceptor level in Sb-doped, p-type ZnO were studied using cathodoluminescence (CL) spectroscopy as a function of hole concentration. Variable-temperature CL measurements allowed us to estimate the activation energy of an Sb-related acceptor from temperature-induced decay of CL intensity. The…