Materials Literature
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A new mold flux has been developed to favour cuspidine crystallisation at the upper level of the mold. This reduces the local heat flux and allows an even solidification of the slab shell, thus preventing any occurrence of longitudinal cracks. Pilot tests have established that the new flux make it possible to cast hyp…
Abstract In this study an attempt has been made to identify analytical methods for detecting magnesium nitride, and document in which part of the magnesium recycling process this phase is concentrated. The samples were taken from a continuous fluxfree recycling session, where an AZ91D magnesium alloy was remelted and…
The structural and magnetic properties of Nd2AlFe16−xMnx (x = 1, 2, 3, 4, and 5) compounds have been investigated by means of X-ray diffraction and magnetization measurements. The Nd2AlFe16−xMnx compounds have a rhomhedral Th2Zn17-type structure. There exist an anisotropic strong spontaneous magnetostriction in magnet…
In the temperature range 100–650 K, the linear expansion coefficient β was measured for the SiC/Si biomorphic composite, a new cellular ecoceramic fabricated from a porous cellular carbon matrix prepared through pyrolysis of wood (white eucalyptus) in an argon ambient with subsequent infiltration of molten Si into the…
Neutron diffraction was used to determine temperature dependence of the Debye-Waller factor and thermal atomic displacements for two polymorphic modifications of lanthanum, namely, α-La with a double hcp (dhcp) crystal structure and β-La with an fcc crystal structure. No substantial changes in the mean-square thermal…
Abstract The corrosion behavior of pure copper electrode exposed to artificial seawater has been studied using electrochemical noise analysis (ENA) and electrochemical impedance spectroscopy (EIS). A diffusion process was observed for copper exposed to chloride media as indicated by the presence of a minimum phase ang…
Ce 3+ -doped Li 6 (Gd 0.99 Ce 0.01 )(BO 3 ) 3 single crystals have been grown by the floating zone method in argon atmosphere with an ultralow oxygen partial pressure, p O 2 ≈10 -23 Pa (Condition A) or under a conventional reduction gas of diluted H 2 (Condition B). The intensities of the excitation and emission spect…
EPR has been used to study of KTiOAsO4 (KTA) single crystals doped with Rh. To induce the paramagnetic centers crystals of KTA were irradiated with γ-rays at room temperature or at 77 K and data were then taken at 77 K. In irradiated at 300 K KTA crystal from angular dependence the principal values and directions of g…
The production of nonlinear polyurethane from the reaction of methyl diisocyanate (MDI) with a mixture of a polyester and 1,4-butanediol was studied in a closely intermeshing, counter-rotating twin-screw extruder, using an ideal reactor model consisting of a series of continuous stirred tank reactors (CSTR) coupled to…
Nanosized SrCe0.95 Y0.05O3-δ powders with homogeneous composition were synthesized by the low temperature combustion process based on the Pechini method. A polymeric precursor sol was formed by using citric acid and ethylene glycol as the chelating agents of metal ions. The perovskite-type SrCe0.95Y0.05O3-δ powders wi…
The α alloy Ti-2Al-2.5Zr and near α alloy Ti-4Al-2V were hydrogenated to various levels. The morphology, orientation relation (OR), and habit plane of the hydrides were studied by means of transmission electron microscopy (TEM). It was found that in the two alloys most of the precipitates are δ-hydrides which have fcc…
Abstract Paratooite-(La) is a new lanthanum-dominant rare-earth copper carbonate from the Paratoo copper mine, near Yunta, Olary district, South Australia. Paratooite-(La) occurs as sheaves and radiating sprays of blade-like to tabular pale blue crystals in thin fissures in a slaty country rock. Individual crystals ar…
A study of surface modification and anchoring techniques
An analytical study on excitation of acoustic waves and novel properties introduced by considering that the implanted ions in a group III-V crystal agglomerate to form nanoclusters (NCs) and some of them acquire negative charge in compensated piezoelectric semiconductor plasma has been presented. By using multi-fluid…
The rate of decomposition of formic acid on a glassy-carbon-Nafion-polyaniline-palladium nanoparticle composite as a function of the state and amount of polyaniline in the composite is studied.
Nous avons resolu la structure cristalline de la kirkiite avec donnees obtenues sur monocristal avec un rayonnement MoKa et un detecteur a aire de type CCD, jusqu'a un residu R 1 de 0.069. Elle cristallise dans le groupe spatial P2 1 /m, avec a 8.621(4), b 26.03(1), c 8.810(4) A, β 119.21(1)° et Z= 2. L'ebauche de la…
A new optical data storage media has been developed, which allows three-dimensional serial data storage and retrieval by two-photon excitation. The disk is essentially of a monolithic structure, and utilizes a proprietary photochromic organic fluorophore as the data storage element. This new data storage chromophore h…
A mathematical model was constructed and solved to quantitatively describe the dynamic behavior of the potassium sorbate diffusion through whey protein films. The model results were compared with the experimental data of the potassium sorbate diffusion through whey protein films, and excellent agreements between the e…
The angular distortion around the impurity Ti 3+ on the trigonal (2a) Al 3+ site of LaMgAl 11 O 19 is theoretically studied from the perturbation formulas of the anisotropic g factors, g || and g ⊥ , for a 3d 1 ion in trigonally distorted octahedra. Based on the studies, the metal-ligand bonding angle is found to incr…
Resistance as a function of temperature showed that the metal–insulator transition temperatures of as-grown and annealed Ag-doped La 0.67 Ca 0.33 MnO 3 thin films were 235 and 300 K, respectively, and that the metal–insulator transition ranges of these films were relatively narrow, indicative of a sharp phase transiti…