Materials Literature
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Some theoretical approaches are reviewed to analyze crystallographic and optical properties of phosphors for white light emitting diodes. Stresses are placed on 1) local electro-neutrality for the structural stability of hosts, and 2) dielectric property and coordination of anion ligands around rare-earth luminescent…
Carbon interaction with rhodium (111) surface has been studied by Auger electron spectroscopy in ultrahigh vacuum within a broad temperature interval of 300-1800 K. It has been shown that the graphene monolayer remains stable on the metal surface within a relatively narrow temperature interval of ∼50 K below the carbo…
Reversible thermoelastic γ-α′ martensite transformations (MTs) have been studied in Fe-28%Ni-17%Co-11.5%Al-2.5%Ta (at. %) single crystals under cooling/heating and loading conditions. It is established that the precipitation of dispersed γ′ phase particles with an average size of d ≤ 5 nm leads to thermoelastic γ-α′ M…
Cranswickite is a newly recognized mineral of composition MgSO 4 ·4H 2 O from Calingasta, San Juan Province, Argentina (IMA2010-016). Cranswickite is monoclinic, space group C2/c, a = 11.9236(3), b = 5.1736(1), c = 12.1958(3) Å, β = 117.548(2)°, V= 667.0(1) Å 3 , Z = 4, d obs = 1.917 g/cm 3 , and d calc = 1.918 g/cm 3…
Poly(L-lactide) (PLLA) films were exposed to ultraviolet (UV) light (254 nm) and water bath of 60°C and 80°C. The limiting viscosity ([η]) of PLLA decreased from initial 187.4 dl/g to 42.2 dl/g after UV irradiation, and to 33.3 dl/g after soaking in 80°C water for 40 h, while the [η] of PLLA exposed to 60°C water rema…
Y1 − x La x FeO3 (x = 0, 0.1, 0.2, 0.3, 0.4) nanocrystals have been prepared by a sol-gel process. With increasing lanthanum content (x from 0 to 0.4), their size decreases significantly (from 34 to 16 nm), whereas their magnetization increases. Raising the annealing temperature increases their size.
Complete sets of elastic, dielectric, and piezoelectric constants of relaxor-ferroelectric single crystals of (1 – x)Pb(A1/3Nb2/3)·O3 − xPbTiO3 (A = Mg or Zn) and Pb(In1/2Nb1/2)O3 − Pb(Mg1/3Nb2/3)·O3 − PbTiO3 are analyzed to demonstrate violations of the interrelations between particular groups of electromechanical co…
Abstract In this study, we investigate the vibrations of the cantilever single-walled carbon nanotube (SWCNT) with attached bacterium on the tip in view of developing the sensor. This sensor will be able to help to identify the bacterium or virus that may be attached to the SWCNT. Two cases are considered: These are l…
A polymer-stabilised blue-phase liquid crystal display (PSBP-LCD) with double-side in-plane switching (DS-IPS) electrode structure is proposed. The DS-IPS electrodes generate more horizontal fields to induce isotropic-to-anisotropic transition in the BP-LC medium through the Kerr effect. The strip electrodes of the to…
We study the oxidation behaviour of Mg 2 Si and the thermoelectric properties of Mg 2 Si composites. Above 723 K, Mg 2 Si reacts with O 2 in air to yield MgO and Si. Using the Johnson-Mehl-Avrami (JMA) equation, the Avrami exponent ( n ) is equal to ~0.5, and it depends on the reaction temperature and time; this indic…
The accurate calculation of iron loss from finite element analysis in electrical machines is essential if optimal machines are to be designed. This paper conducts a holistic review of the extensive literature field before examining, in detail, several methods in order to recommend an optimum engineering solution. Both…
The hydrogenation and dehydrogenation of a thin film of Mg with a Pd cap layer was measured using neutron reflectometry. Upon hydrogenation, (at 373 K and 0.2 MPa H2), the Mg film swelled in the surface normal direction by an amount roughly equal to the difference in volume between MgH2 and Mg. After dehydrogenation (…
The magnetic properties of an antiferromagnet with trigonal symmetry, namely, HoFe 3 (BO 3 ) 4 , have been investigated theoretically. The calculations have been performed in the molecular field approximation and in the framework of the crystal field model for the rare-earth subsystem. Extensive experimental data on t…
This review paper provides an overview of the use of ceria-based catalytic materials towards the industrial hydrogen production via the hydrocarbon steam reforming and the water-gas shift reaction routes with a focus on representative patenting activities mainly in the last 10 years. We first introduce the basic mecha…
In this article some fundamental aspects of dielectric loss estimation using DAC voltage are described. Damped ac voltage testing is an alternative method of continuous ac voltage testing. It provides a method of assessing the condition of the insulation of capacitive test objects, e.g., power cables or stator winding…
Magnetic properties of a motor core are affected by the distortion due the cutting and the compression caused by a shrink fitting etc. The report which investigates such behavior systematically is few, although the examination of the detailed behavior of magnetic properties is important. In this paper, the mechanical…
The temperature dependence of helical pitch for members of an homologous series of orthoconic antiferroelectric compounds (3FmHPhF) and their bicomponent mixtures (m = 3 and 5 as well as m = 3 and 7) has been measured by the method of selective light reflection. The compounds have the same chiral centre but they have…
In order to clarify the best condition for the growth of iron chalcogenide superconductor thin films, we investigated the effect of the substrate on the transport and structural properties of films. Thin films of FeSe 0.5 Te 0.5 grown by pulsed laser deposition were characterized by DC electrical resistivity, Hall eff…
Based on first-principles calculations, we study the electronic structures and magnetic properties of a two-dimensional CdS nanostructure upon hydrogenation adsorption. The results show that the hydrogen atoms can adsorb on Cd atoms within the graphenelike Cd layers with favorable formation energies, and the resulting…
Soluble conducting alkyl polypyrrole polymers have been applied by either chemical polymerization of the 3-alkyl monomers or direct application of polymer emulsion to the surface. Solution, vapor and spray polymerization methods of coating poly(3-alkylpyrroles) to the surface of woven wool fabrics are explored. Conduc…