Showing papers in "Journal of Alloys and Compounds in 1993"

TL;DR: In this paper, Electrochemical impedance spectroscopy (EIS) was applied to metal hydride electrodes to investigate the deterioration of metal hydide electrodes using a mischmetal-based alloy, MmNi 3.5 Co 0.7 Al 0.8, using EIS.

TL;DR: In this article, the complex oxides in the CeO2ZrO2 system were examined for the improvement of oxygen storage capacity in automotive catalysts, and the formation of CeO 2 Zr oxide solid solution improved the thermal stability and activity of the system.

TL;DR: In this paper, a valence change from RE 3+ to RE 2+ (REEu, Sm, Yb) was observed in samples of SrB 4 O 7 : RE prepared by solid state reaction at high temperature in air.

TL;DR: In this paper, the oxygen storage capacity of cerium oxide (CeO2) containing zirconium oxide(10, 20, 30, 50, 85, 93 mol%) was studied by measuring temperature programmed reduction.

TL;DR: In this article, the yellow-to-blue intensity ratio (Y/B) of Dy3+ emission was investigated and the degree of covalency between Dy-O-M and O2-M was found to increase with decreasing Z/r or electronegativity of the next-neighbour element M in the complex oxides Dy O-M.

TL;DR: In this article, a green-light-emitting device using tris(acetylacetonato)Tb 3+ complex was used as the emitter material and the cell structure was glass substrate/In-SnO/hole transport diamine/Tb complex/Al, and the EL cells were fabricated by means of vacuum deposition.

TL;DR: The compound FeN was prepared as a single phase by d.c. reactive sputtering and its crystal structure was determined by X-ray diffraction measurements to be the zinc blende type f.c structure as discussed by the authors.

TL;DR: In this paper, the effects of many kinds of additives in anisotropic magnet powders produced by the hydrogenation, decomposition, desorption, recombination (HDDR) process were studied, particularly with regard to magnetic properties and microstructures.

TL;DR: In this article, the authors report on the far from equilibrium phase transitions induced by mechanical alloying and post-milling isothermal annealing in the FeSi system.

TL;DR: In this paper, the standard enthalpies of formation of aluminides in binary systems Y+Al, Zr+Al and Nb+Al were determined by direct synthesis calorimetry at 1473 ± 2 K. The results were compared with earlier experimental data and with predicted values from Miedema's semi-empirical model.

TL;DR: The magnetic susceptibilities of La2Mg1−xZnxIrO6 (0 < x < 1), La2NiO6, BaLaFeO6 and BaLaCoO6 have been measured as a function of temperature and applied magnetic field.

TL;DR: An extended group of compounds of the general formula An 2 T 2 X (An�U, Np; T Ni, Co, Rh, Pd, Pt, Ir; X�In, Sn), which crystallize in the tetragonal structure (U 3 Si 2 type), were determined using X-ray diffraction on single crystals as mentioned in this paper.

TL;DR: In this article, the influence of impurity atoms, especially the interstitial elements, on some of the properties of pure rare earth metals and the stabilization of non-equilibrium structures of the metals (i.e. non-existent polymorphs) is discussed.

TL;DR: In this paper, a review of recent applications of rare earth luminescence are reviewed in connection with their physics background. And some problems of the future are outlined: cheaper phosphors for lamps, higher efficiencies, time characteristics in the field of X-ray phosphors, and synthesis procedures.

TL;DR: In this paper, the magnetic properties of several compounds of the type RMn 6 Ge 6 (R is a heavy rare-earth element) were determined and the magnetic behavior of these compounds was described as bootstrap ferrimagnetism.

TL;DR: In this paper, the ternary compounds YMn6Ge6 and LuMn 6Ge6 of the CoSn-B35-type structure (space group, P6/mmm) were studied and the results showed that at low temperature a spin reorientation process occurs in both compounds, yielding incommensurate antiferromagnetic arrangements.

TL;DR: In this article, the NiTiH x (x = 1.0 and 1.4) has been prepared by a two-step method comprising an electrochemical treatment followed by a hydrogen gas pressure charging.

TL;DR: In this paper, the gold-rich side of the Au-sn system has been examined using differential thermal analysis, differential scanning calorimetry and electron probe microanalysis, and the presence of three intermetallic phases between gold and AuSn has been verified, although the composition ranges reported here are significantly different from those of previous studies.

TL;DR: In this article, a double layer of perovskite units (LaNb 2 O 7 ) and an alkali ion or proton is located at the sites between the layers.

TL;DR: In this paper, a fast solidified LaNi5-based hydrogen storage alloys were prepared by a melt-spinning method, which had very fine crystal grain of below 10 μm.

TL;DR: In this article, the standard enthalpies of scandium alloys, Sc+Me (MeFe, Co, Ni, Ru, Rh, Pd, Ir, Pt) were determined by direct synthesis calorimetry at 1473±2 K.

TL;DR: In this paper, phase structure and magnetic properties of mechanically alloyed and heat-treated Sm x Co 1−x with x = 0.13 to 0.24 have been carried out.

TL;DR: In this article, solid state amorphization of intermetallic compounds induced by hydrogenation is described, and the crystal structures and chemical compositions of the amorphizing intermetall compounds, the formation conditions and formation processes of amorphous metallic hydrides, the mechanism of ammorphization and the factors controlling the occurrence of amomorphization in C15 Laves compounds are discussed.

TL;DR: In this article, the compounds LnPdAl (Ln  Ce, Pr, Nd) were found to crystallize in the hexagonal Fe2P structure, probably in the ordered ZrNiAl variant.

TL;DR: In this article, the far-from-equilibrium phase transition induced by mechanical alloying in the FeCu system has been investigated by means of X-ray diffraction patterns, scanning electron microscopy observations, chemical energy-dispersive analyses and thermal stability studies (differential scanning calorimetry and thermomagnetometry).

TL;DR: In this paper, the role of defects in the amorphization of ordered intermetallic compounds by high energy ball milling was addressed, and the structural evolution with milling time was studied experimentally in the intermetall compounds Ni3Si and CoZr.

TL;DR: In this paper, diffusivities of early transition metal-late transition metal (ETM-LTM) components in crystalline and amorphous phases are reviewed, and the alloy characteristics leading to fast diffusion of LTM species and to good glass-forming ability are described.

TL;DR: In this paper, a series of compounds CaLixAl2 − x was synthesized and structurally characterized in order to probe the effect of valence electron concentration on both global and local structural features in main group intermetallics.

TL;DR: In this paper, the standard enthalpies of formation of aluminides in the binary systems La-Al, Hf-Al and Ta-Al were determined by direct synthesis calorimetry at 1473 ± 2 K. The results were compared with earlier experimental data and with predicted values from Miedema's semi-empirical model.

TL;DR: The luminescence properties of activated Ca4Gd(BO3)3 are more similar to those of the activated oxides than to other activated borates as discussed by the authors, which is explained on comparison of the crystal structures.