Materials Literature
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We report the spin-polarized as well as non-spin-polarized band structure calculations of CrO 2 based on the local spin-density approximation of the density functional theory. Our result shows that the Fermi level of magnetic CrO 2 is located in an insulating gap in the minority-spin bands between oxygen p and chromiu…
Optical microscope observations and linear birefringence measurements were performed to obtain more information on the phase transitions and phases properties of the N(CH3)4FeCl4 single crystal. At least four phase transitions of first order were detected (at 385 K, 303 K, 294 K and 265 K on cooling), some of them of…
Poly(diphenylamine-4,4 ′ -diyl) receives electrochemical oxidation with E pa of about 0.6 V vs Ag/AgCl with a high doping level (number of positive charges stored per the repeating unit of the polymer) of about 2 in aqueous H 2 SO 4 solutions. The oxidized polymer exhibits an electrical conductivity of 0.2 Scm -1 at r…
Phases formed upon isothermal treatments of sol-gel prepared PZT andPLT films at different temperatures have been determined. In PZT, the sequence of phase formation with increased temperature is found to be: Amorphous → Amorphous + Pyrochlore + PbO → Pyrochlore + PbO → Pyrochlore + PbO + Perovskite → PbO + Perovskite…
This handbook is based on an earlier French laboratory guidebook A Guide on Radionuclides and Radioprotection by D Delacroix et al published in 1994. The earlier publication was orientated towards guidance on the handling of radionuclides used in medicine. The main purpose of this handbook is the provision of data she…
The spectrum of luminescent F centers generated in high-purity KCl crystals by 7–10.2-eV photons has been measured at 230 K. The pulsed annealing of these centers (250–550 K), as well as the dependence of the efficiency of stable F-center generation on irradiation temperature (80–500 K) has been studied. The efficienc…
The solidification process and hardenability of high speed steel type cast irons were investigated using a series of hypo-eutectic alloys of Fe-% C-5% Cr-5% Mo-5.5% V-(0,5)% W-(0,5)% Co-(0,5)% Ni and a hypereutectic Fe-2.3% C-5% Cr-5% Mo-9% V-5% W-5% Co alloy. In each hypo-eutectic alloy, the crystallization proceeds…
Abstract The interaction of sulfur, ZnO and 2- t -butylbenzothiazole sulfenamide (TBBS) was investigated by differential scanning calorimetry (DSC) in the absence of rubber. Special reference was made to the role of the amine, the distinguishing characteristic of all sulfenamides. TBBS decomposes rapidly at 211 °C, th…
A straightforward and generalizable synthesis of metal-free (H2) and metal derivatives (M = Ni, Co or Zn) of a symmetrically tetrasubstituted phthalocyaninc derived from tetrathiooxaphthalonitrile is described. All of these complexes were insolublc in common solvents such as DMF, chloroform. ethanol and water. Structu…
The uvarovite garnet (CaO)3 (Cr2O3 )(SiO2 )3 has been synthesised (mineralised with borax to facilitate diffusion of precursors) by several sol–gel methods. Two routes for uvarovite formation have been observed: where CaCrO4 forms as an intermediate phase; and where metastable pseudowollastonite (α-CaSiO3 ) forms as a…
Three antimony-containing polymers (P1, P2, P3) were synthesized by reacting triphenyl antimony dinitrate with bisphenol A (P1), with tetrabromobisphenol A (P2) and with N,N′-bis(4-hydroxybenzylidene)-oxydianiline (P3). Solubility, density, chemical and thermal stability of these antimony polymers have been evaluated.…
Two homeotypical phases occur at the mole fraction x Al ≈0.75 in the ternary system Co-Ni-Al: the pseudoternary intermetallic compound ( Co , Ni ) 4 Al 13 ( h ) (space group C 2/ m , Pearson code mC (34-1.8)) [Notation, according to Parthé et al. ( 1993 ). TYPIX, Standardized Data and Crystal Chemical Characterization…
This paper discusses the process by which a thermodynamically unstable impurity atmosphere consisting of hydrogen atoms displaces an edge dislocation. Relationships are obtained for the displacement force in the approximation of dilute solid solutions. The results of theoretical analysis are used to explain the hydrog…
Pressure dependence of the hydrostatic piezoelectric coefficient dh was measured for PVDF and P(VDF-TrFE) polymer foils in the range up to 60MPa. The hydrostatic strain coefficient dh, the hydrostatic voltage coefficient gh and figure of merit dh·gh were determined using the static method. Electric charge induced acro…
Sm3Cl[SiO4]2: A Chlorine-poor Chloride Orthosilicate of Samarium Pale yellow, plate-like single crystals of Sm3Cl[SiO4]2 (orthorhombic, Pnma; a = 701.74(8), b = 1800.8(2), c = 626.63(7) pm; Z = 4) are obtained upon the reaction of SmCl3, Sm2O3 and SiO2 (”︁Kieselgel”︁”︁) in 1 : 4 : 6 molar ratios, most advantageously i…
Mosaic spread values for crystals grown in microgravity were measured using synchrotron radiation. Full width at half maximum (FWHM) values for diffraction line profiles in the range 10-20" (arc seconds, 1" = 1 degrees /3600) were observed. These values are similar to those measured for crystals grown on earth using t…
Alkaline earth benzoates were synthesized using hydrothermal reaction. The complexes were characterized by elemental analysis, IR, X-ray powder diffraction. All of them are monoclinic and have layered structure. The mechanism of thermal decomposition of alkaline earth benzoates was studied by using TG, DTA, IR and gas…
<div class="htmlview paragraph">Fleet tests conducted on electrical vehicles around the world have very clearly shown that battery-powered cars may be regarded as zero-emission vehicles with respect to their local environments only. Emission measurements on vehicles powered by internal-combustion engines equippe…
<div class="htmlview paragraph">Conventional powder metal (PM), at typical press and sinter densities of around 7.0 g/cm<sup>3</sup>, cannot be considered as a viable manufacturing technology for automotive transmission gears because of deficits in mechanical durability. The durability limitations ar…
Abstract SERS technique wae used to study the chemiesorption kinetics of Methylene Blue (MB) on the HNO 3 ‐etched silver surface. The adsorption kinetic parameters were deduced from different vibrational modes at a low concentration of 3.5 × 10 −6 mol/L, and it showed that MB adsorbed uniformly (monolayerly) on silver…