Materials Literature
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Dielectric polarization P (∥[110]) of a single crystal of a triangular lattice antiferromagnet CuFeO 2 has been measured by pyroelectric technique in pulsed high magnetic fields up to 43 T applied along the [001] direction. Among the five phases successively appeared in magnetic fields, a finite P is observed only in…
Pb ( In 0.5 Nb 0.5 ) O 3 (PIN) crystals show different ferroelectric features depending on the thermal treatments applied. Different treatments result in an ordered PIN exhibiting an antiferroelectricity, or a disordered PIN exhibiting relaxor behavior. These crystals were examined using synchrotron x-ray diffraction.…
Among ceramic materials, the alumina has high importance because of its characteristics of resistance and refractory. The possibility to improve the final characteristics of this material, open possibilities for new applications. The aim of this work is to synthesize (α-Al2O3) alumina powders by combustion reaction an…
Within the framework of a quantum mechanical model, the polarization component of the energy of cohesion of an ionized DNA molecule to the surface of a nanotube has been calculated. Neglecting the polarization of the DNA, and in the absence of external screening, the binding energy is ∼0.47 eV per elementary charge. T…
We investigated the photoluminescence (PL) properties of Mn2+-doped CdS (CdS:Mn2+) quantum dots (QDs) prepared by a reverse-micelle method. A PL band which originates from the intracation transition, the so-called d-d transition, of tetrahedrally coordinated Mn2+ ions, is clearly observed at ∼2.1eV, indicating that Mn…
Purpose To develop and test a rapid method for evaluation of the corrosion protection (CP) of carbon steel (CS) by vapour corrosion inhibitors (VCI) films. Design/methodology/approach The determination of the CP by VCI on CSs is commonly carried out in a chamber applying neutral salt spray (NSS) and usually it takes m…
A pneumatic gas gun has been used to fire ogive-nosed projectiles on aluminium plates (1mm) at varying impact velocities above the ballistic limit. Impact and residual velocities have been measured. Deformation of the target plate was studied. Experimental results formed the basis of a subsequent finite element analys…
R. DĄBROWSKI*1 and V. BEZBORODOV2 1Institute of Chemistry, Military University of Technology, 00‐908 Warsaw, Poland 2Institute of Applied Physics Problems, Minsk 220064, Belarus A Commentary on the...
Mild steel is very important material for petroleum industry and it is used in several processing units like oil recovery, refining of crude oil, transportation, storage and petroleum products. Processing of crude oil is done in environment having strong acids and at high temperature, hence, rate of corrosion increase…
Energy-dispersive X-ray microanalysis technique has been commonly used in failure analysis. It is vital for an analyst to understand the electron penetration depth in a certain material so as to be able to select an appropriate accelerating beam voltage. In this paper, we will use the Monte Carlo electron flight simul…
Abstract Synthesis, Characterization and Magnetic Properties of a Tetranuclear, Thiacalix[4]aren stabilized Manganese Complex Synthesis, characterization and magnetic properties of the compound [(TCA)(TCAH)Mn 4 (acac)] ( 1 ) are reported, the first tetranuclear thiacalix[4]aren stabilized manganese complex synthesized…
The structure, phase composition, morphology, and electrical conductivity of Ni-Cu alloy ultrathin films having a thickness of d = 1−10 nm and a Cu concentration of 10–95 at % have been studied. All films are shown to be fcc Ni-Cu alloys; they have an island structure with an island size of 1.5–2 nm in the as-deposite…
Four new de Vries I-A-C* ferroelectric liquid crystal mixtures have been formulated to have high tilt (45°), high polarization, and low smectic layer shrinkage for use in analog electro-optic phase modulators. The mixtures are based on a high-tilt anti-ferroelectric compound which, when combined with other compounds,…
The synthesis, X-ray crystal structure, and magnetic studies of a rare example of organic/inorganic spin hybrid clusters extended in infinite ladder-type chain [Cu(C5F6HO2)2]7(C35H35N5O4)2 ([Cu(hfac)2]7(pyacbisNN)2, 2) formed by the reaction of a high spin nitronylnitroxide biradical C35H35N5O4 (pyacbisNN, 1) and bis(…
Abstract The influence of heat treatment on the performance of various polymers as iron oxide dispersants in an aqueous system has been investigated. The polymers evaluated include: homo-polymers of acrylic acid, methacrylic acid, maleic acid; co-polymer of, acrylic acid:2-acrylamido-2-methylpropane sulfonic acid; ter…
We review our main experimental and theoretical results on the optical emission properties of Si-nanocrystals (Si-nc's) fabricated by colloidal and thin film deposition techniques, showing that the surface chemistry of the Si-nc's or the surrounding matrix play a crucial role in determining both the structural stabili…
The reactive ion etching characteristics of ZnO have been investigated as functions of CH 4 /H 2 gas composition, total gas pressure, and radio frequency (rf) plasma power. It was found that the etching rate of ZnO strongly depends on gas composition and gas pressure, suggesting that the etching of ZnO largely involve…
The synthesis, phase transition parameters, the temperature dependence of spontaneous polarization, tilt and pitch of (S)-(+)-4-(1-methylheptyloxycarbonyl)phenyl 4′-(cyanoacetoxy hexoxy)biphenyl-4-carboxylates and (S)-(+)-4-(1-methylheptyloxycarbonyl)biphenylyl 4′-(cyanoacetoxy)benzoate are described. These compounds…
It was revealed that the ML 2 complexes (L - is the anion of 3,3′,5,5′-tetramethyl-4,4′-dibutyldipyrrolylmethene; M = Cu 2+ , Zn 2+ ) are coordinatively unsaturated and, therefore, are able to coordinate electrondonor molecular ligands (pyridine and dimethylformamide (DMFA)) with the formation of ML 2 (Solv) 2 solvate…
A single-stage procedure was developed for preparing carboxylated microcrystalline cellulose from native cellulose in 45–55% nitric acid acting as a deposited form of catalyst of cellulose oxidation, nitrogen(IV) oxide, and as a selective reagent partially hydrolyzing cellulose.