Showing papers in "Journal of Alloys and Compounds in 2002"

TL;DR: In this paper, the state of the art in coating and surface modification technologies, applied to magnesium-based substrates for improved corrosion and wear resistance, are discussed, including electrochemical plating, conversion coatings, anodizing, gas phase deposition processes, laser surface alloying/cladding and organic coatings.

TL;DR: In this article, a new generation of solid-state laser and optical materials on the basis of highly transparent nanocrystalline yttrium aluminium garnet Y3Al5O12 (YAG) ceramics was developed and adequately characterized.

TL;DR: The crystal structure of LiBH4 has been studied by synchrotron X-ray powder diffraction at room temperature and at 408 K at T =408 K.

TL;DR: In this article, the reversible hydrogen storage properties of Ti-catalyzed NaAlH 4 (and associated Na 3 AlH 6 ) were studied as a function of the Ti-content using a dry preparation technique.

TL;DR: In this paper, phase equilibria among the A2, B2, D03, L12 and D019 phases were determined by transmission and scanning electron microscopies (TEM and SEM) and energy dispersion spectroscopy (EDS), mainly using a conventional diffusion couple (DC) technique.

TL;DR: In this article, the authors investigated the kinetics of hydrogen absorption and desorption by magnesium by using a volumetric technique and obtained an expression for the driving force of the reaction and its activation energy.

TL;DR: In this paper, the state-of-the-art Ti-Cl-based catalysts and doping processes are presented along with their own studies and the implications for the viability of these materials in on-board hydrogen storage applications.

TL;DR: A critical review of the literature on hydrogen storage in carbon nanostructures can be found in this paper, where the authors show a reversible hydrogen storage only for single-walled carbon nanotubes (SWNTs).

TL;DR: In this paper, the fabrication and characterization of Nb 2 AlC (actual Nb:Al:C ratios: 52.5±0.5, 27.3± 0.3 and 24.4±0.5 at.

TL;DR: In this paper, the effects of continuous heating on the crystallisation kinetics and phase transformation behavior of electroless nickel-phosphorus deposits plated on mild steel substrates, with high phosphorus contents of 12 and 16 wt, were studied.

TL;DR: In this paper, the deformation behavior of fine-grained magnesium alloys reinforced by quasicrystalline particles was investigated and compared with that of commercial AZ31, AZ61 and AZ91 alloys.

TL;DR: In this paper, the 4f n −1 5d-level crystal field splitting of inorganic compounds is reviewed and a clear correlation between the splitting and the type of anion coordination polyhedron (Octahedral, cubal, dodecahedral, tricapped trigonal prism, and cuboctahedral) around the lanthanide ion is demonstrated.

TL;DR: In this paper, the effect of titanium as reinforcement and its increasing amounts with the microstructural, physical and tensile properties of magnesium was investigated and the results showed that the presence of titanium reinforcement led to an improvement in yield strength and ductility while the UTS was adversely affected.

TL;DR: In this article, the authors investigated hydrogen storage and structural properties in nano-composite three-layered Pd(50 nm)/Mg(x nm)/Pd( 50 nm) films with x=25, 50, 200, 400 and 800 prepared by an RF-associated magnetron sputtering method.

TL;DR: In this article, the long-term cycling stability as well as the thermal stability of the hydriding-dehydriding properties of nanostructured MgH2 with 0.2 mol.% Cr2O3 catalyst additions synthesized by ball milling was investigated.

TL;DR: In this article, a model that entails substitution of sodium cations by variable valence transition metal cations and the creation of Na+ vacancies in the bulk hydride lattice was proposed.

TL;DR: In this article, the reversible Mg 2 FeH 6 and the mixed Mg2 FeH6 and MgH 2 hydride systems were investigated on a micro- or nanoscale level.

TL;DR: In this paper, the crystal structure of the Cu2Zn/Cd,Hg/SnSe4 compounds were investigated using X-ray powder diffraction and the results showed that these compounds crystallize in the stannite structure (space group I 4 2m).

TL;DR: In this article, the possibility of using the disproportionation reaction of the Sm 2 Fe 17 compound for the production of powders with a fine α-Fe structure was investigated, for use as electromagnetic wave absorbers that can operate in the GHz frequency range.

TL;DR: In this article, the hydrogen storage properties of catalyzed NaAlH 4 (and associated Na 3 AlH 6 ) were studied in relation to various practical engineering considerations, including cyclic capacity, charging and discharging rates, thermal effects, gaseous impurities, volume changes, low temperature plateau pressures and detailed isothermal desorption kinetics over the temperature range 23-180°C.

TL;DR: In this paper, the deformation behavior and hydrogen permeation performance of Pd-plated cold-rolled and unrolled samples have been examined, and durability tests showed that hydrogen permeability decreased by 5% in 2 weeks at 573 K and 30% in 1 week at 473 K. The deteriorated permeability was recovered successfully by a baking treatment.

TL;DR: In this paper, the X-ray diffraction patterns and Fourier transform infrared (FT-IR) spectra were interpreted in terms of stacking disorder in hydrozincite crystals.

TL;DR: In this article, the authors tried to improve the hydrogen sorption properties of Mg by mechanical grinding under H 2 (reactive mechanical grinding) with oxides Cr 2 O 3, Al 2 O3 and CeO 2.

TL;DR: The phase relationships, crystallography and magnetic phase diagram of the pseudo-binary Gd5Si4-Gd5Ge4 system in the as-cast state is described in this article.

TL;DR: In this article, the effects of current density on the mechanical and chemical properties of MAO coatings have been studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDX), and micro-hardness test.

TL;DR: In this article, the quenching processes of the Ln(III) excited states, strongly dependent on energy of vibrators resulting from ligands (and/or solvents) and energy gaps, between the emissive state and the highest sublevel of the ground state, are described.

TL;DR: In this article, the authors describe the development of functionally graded hardmetals prepared in situ by sintering in reactive atmosphere from the basic investigations in laboratory scale over upscaling in industrial furnaces to the performance upon continuous cutting of steel.

TL;DR: In this paper, the effects of composition and heat-treatment on the protium absorption-desorption properties of Ti-V-Cr alloys were investigated, and it was found that the Ti-35V-40Cr alloy exhibited a 2.6 mass% protium capacity.

TL;DR: The interpretation of data in terms of covalency in the M-L bonds is reviewed with emphasis on which orbitals are involved in this paper, and controversy continues today on the degree of co-lociability in the bonds of the 4f and 5f elements.

TL;DR: In this article, the negative thermal expansion coefficients of Fe 2 (MoO 4 ) 3, Cr 2 and Al 2 (Al 3 ) 3 compounds were investigated in static air in the temperature range of 298-1073 K by a thermo-dilatometer.