Investigations of hydrogen storage properties in certain Zr-based AB2 alloys
TL;DR: In this article, the hydrogen storage properties of ZrMnFe045Co045V01 and ZrN09V01Fe05CoCo05Co05, which are of C14 hexagonal structure, are studied in the ranges of 3⩽P ( bar )⩻30 and 30⩾T (° C )⦽100 .
About: This article is published in International Journal of Hydrogen Energy.The article was published on 2002-04-01. It has received 9 citations till now. The article focuses on the topics: Hydrogen storage & Hydrogen.
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TL;DR: In this article, the hydrogen absorption behavior of the Zr0.5−x alloy with 0.9Ti0.1NiMn 0.5CrxV0.6 was studied by volumetric and electrochemical techniques.
24 citations
TL;DR: In this article, the hydriding properties of Zr-based AB2 alloy produced by gas atomization have been investigated during its absorption-desorption reaction with hydrogen gas.
24 citations
TL;DR: In this article, a hydriding combustion synthesis (HCS)-based AB2 hydride composite was used to produce Mg-20AB2 and Zr-40AB2 composites.
22 citations
TL;DR: In this article, the structural and hydrogen storage properties of Zr 1− x Co x Fe 2 (x ǫ = 0.2, 0.3, 0 4, 0.5) hydrogen storage alloys have been systematically investigated.
17 citations
TL;DR: In this article, the formation of pure ZrMn 2 alloy through the electro-deoxidation of the mixed oxide pellets at 3.1 V for 12 h in 900 °C CaCl 2 melt.
12 citations
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TL;DR: In this paper, a correlation between the stabilities of metal hydrides (measured in terms of the free energies of formation of the hydride phase per mole H 2 ) and the radii of tetrahedral holes in both hexagonal AB 5 and cubic AB (B 2 ) intermetallic compounds was established.
Abstract: A correlation has been established between the stabilities of metal hydrides (measured in terms of the free energies of formation of the hydride phase per mole H 2 ) and the radii of tetrahedral holes in both hexagonal AB 5 (D2 d ) and cubic AB (B 2 ) intermetallic compounds. The correlation demonstrates that as the tetrahedral hole size increases, the stability increases. The results of this correlation show conclusively that hole size can be employed effectively in determining the stabilities of intermetallic compound-hydrogen phases. A model, which depends solely upon lattice parameters, was developed to compute the radii of tetrahedral holes in hexagonal AB 5 intermetallic compounds. A similar model, which requires a ratio of metallic radii in addition to the lattice parameter, has been employed to compute the radii of tetrahedral holes in the cubic AB intermetallic compounds. The thermodynamic and structural properties of hexagonal AB 5 -hydrogen systems and cubic AB-hydrogen systems have been compiled and are presented. The quantitative correlations are excellent. A change in valence of the A atom in the hexagonal AB 5 intermetallic compounds may have a significant effect on the stabilities of the hydride phases formed. In those cases where the B atoms were partially substituted in the hexagonal AB 6 and the cubic AB intermetallic compounds, a good correlation of stability with hole size was found. Gross deviations of the Ce-base AB 5 hydride data from the correlation line established by all the other AB 5 hydrides were observed. These were rationalized on the basis of well-documented stress-induced lattice contractions of Ce intermetallic compounds. The resulting contracted hole sizes of the CeNi 5 and CeCo 5 compounds modified the stability of their hydrides. These compound hydrides demonstrate a displaced but similar correlation to the other AB 5 hydrides, i.e . the smaller the hole size, the less stable is the system.
277 citations
TL;DR: In this paper, the C-15-type Laves phase structure of intermetallic compounds Zr 1-x Ho x Co 2 (x = 0.4, 0.6 and 0.8) was determined for the intermetall compounds with a temperature range 50-200 °C at pressures up to 40 bar.
36 citations
TL;DR: In this article, the authors investigated the hydrogen absorption pressure-composition-isotherms of the PuNi3 type rhombohedral Tb1−xZrxFe3 alloys in the temperature and pressure ranges 75≤T(°C) ≤150 and 0.1≤P(bar)≤25, respectively, with a view to study the dependence of hydrogen solubility and plateau pressure on Zr content.
17 citations
TL;DR: In this article, the authors investigated the hydrogen absorption and desorption properties of the PuNi 3 type rhombohedral Zr 0.1 Tb 0.9 Fe 1.5 Co 1.1.
16 citations
TL;DR: In this article, the pseudobinary system Zr 1 − x Ho x Co 2 ( x = 0.2, 0.4, 0.6 and 0.8) belonging to the C15-type Laves phases was studied.
Abstract: Hydrogen absorption studies were carried out on the pseudobinary system Zr 1 − x Ho x Co 2 ( x = 0.2, 0.4, 0.6 and 0.8) belonging to the C15-type Laves phases in the temperature range RT ⩽ T (° C ) ⩽ 300 and the pressure range 0.001 ⩽ P (bar) ⩽ 1. Hydrogen absorption was found to increase with increasing holmium concentration. For the compositions x = 0.6 and 0.8, the pressure-composition isotherms indicated the occurrence of a phase transformation. The relative partial molar enthalpy and entropy of hydrogen solution calculated for all the concentrations were found to be approximately −(7–18) kJ (mol H) −1 and −(10–48) J K −1 (mol H) −1 respectively.
15 citations