Hydrogen solubility and thermodynamics of hydrogen absorption in palladium rich binary Pd1−xHox (x=0.05 and 0.08) solid solution alloys
TL;DR: In this paper, the hydrogen solubility and the thermodynamic parameters for absorption of hydrogen in Pd 1− x Ho x (x = 0.05 and 0.08) solid solution alloys have been determined from the pressure-composition isotherms in the ranges 473≤T/K≤873 and 0≤P/mbar≤900 using a pressure reduction method.
About: This article is published in Journal of Alloys and Compounds.The article was published on 1997-06-20. It has received 2 citations till now. The article focuses on the topics: Hydrogen & Solid solution.
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TL;DR: In this paper, the relative chemical potential of the dissolved hydrogen (ΔμH0) and the partial pair interaction free energies, gHP↔z, and ( g H P ↔ Z Z ) average respectively, in Pd based Pd1 − xZx-H and Pd 1 − x − yZxZ′y-H systems are correlated to the stability of the octahedral interstitial sites.
11 citations
TL;DR: In this article, the hydrogen solubility properties of ternary Pd1-x-yDyxNiy (x = 0020,0040; y = 00555,0111) alloys were investigated in the ranges 473≤T ǫ(K)≤873 and 005≤P(bar) ≤25 respectively.
Abstract: The hydrogen solubility properties of solid-solution ternary Pd1-x-yDyxNiy (x = 0020,0040; y = 00555,0111) alloys are investigated in the ranges 473≤T (K)≤873 and 005≤P(bar)≤25 respectively From the lattice parameters of the alloys and the thermodynamic parameters of the alloy-hydrogen system, it has been found that the hydrogen solubility properties of these alloys are determined mainly by electronic effects The relative partial molar enthalpy in the two-phase region implies that hydrogen atoms have a preference towards occupation of the interstitial sites surrounded mostly by Ni atoms
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TL;DR: In this paper, a review of the properties of the palladium-hydrogen system is presented, focusing on the differences between the three isotopes in the Pd-D system, the deuterium system, and the tritium system.
Abstract: In this review an attempt is made to highlight some of the important properties of the palladium-hydrogen system. (The term hydrogen will be used as a collective term when referring to all three isotopes, but otherwise the names of the specific isotopes, protium, deuterium, and tritium, will be used.) Most of the data in the literature are for the palladium-protium system; generally the three isotopes behave similarly, however, the thermo dynamic and kinetic (diffusion) behavior of the isotopes differ quantita tively and these differences are discussed below. Lasser recently published a monograph entitled Tritium and Helium-3 in Metals (1), which contains a compilation of the thermodynamic prop erties of all three isotopes in palladium and in palladium-silver alloys. Lewis presented a comprehensive review in 1966 (2), certain aspects of which he has updated (3). Wicke & Brodowsky (4) reviewed the thermo dynamic and kinetic behavior of palladium-hydrogen and palladium alloy hydrogen systems in 1978. In view of the interest in this system, kindled by the recent discovery of possible anomalous effects in the Pd-D system, it appears to be a timely occasion to review the palladium-hydrogen system. The palladium-hydrogen system has long held a key role in metal-
407 citations
TL;DR: Some palladium-yttrium alloy diffusion membranes have been developed which are both significantly stronger and more permeable to hydrogen than the present, commercially used, Pd-Ag membrane as mentioned in this paper.
Abstract: Some palladium-yttrium alloy diffusion membranes have been developed which are both significantly stronger and more permeable to hydrogen than the present, commercially used, Pd-Ag membrane. The permeabilities of these alloys as a function of both temperature and pressure are compared with that of the commercial Pd-25%Ag alloy. The effect of surface oxidation on the activity of the membranes has also been investigated.
127 citations
TL;DR: In this article, the authors present a Zustandsdiagramme des Pd with Y, Sm, Gd, Dy, Ho and Er werden anhand thermoanalytischer, mikroskopischer und rontgenographischer Untersuchungen aufgestellt.
Abstract: Zusammenfassung Die Zustandsdiagramme des Pd mit Y, Sm, Gd, Dy, Ho und Er werden anhand thermoanalytischer, mikroskopischer und rontgenographischer Untersuchungen aufgestellt. Allgemein wird die Existenz von 7 intermetallischen Verbindungen nachgewiesen, von denen LnPd3, Ln4Pd5 und LnPd stets kongruent schmelzen. LnPd2. Ln2Pd3 und Ln3Pd2 entstehen durch peritektische Reaktionen. Ln5Pd2 schmilzt fur Ln = Y, Dy, Er kongruent und fur Ln = Sm, Gd, Ho inkongruent. Sm2Pd3 existiert nicht, Gd2Pd3 nur zwischen 1130° und 1160°C. Im System Sm-Pd tritt die sich peritektisch bildende Phase SmPd5 auf. Uber die Strukturen von LnPd3, LnPd. Ln3Pd2 und Ln5Pd2 werden Angaben gemacht.
123 citations
TL;DR: In this article, the room temperature lattice spacings of some Pd-La, Ce, Pr, and Y alloys and the magnetic susceptibilities over a range of temperatures of some pd-Ce and PdY alloys, have been measured.
Abstract: The room temperature lattice spacings of some Pd-La, Ce, Pr and Y alloys and the magnetic susceptibilities over a range of temperatures of some Pd-Ce and Pd-Y alloys, have been measured. The lattice spacings indicate that there is a small solubility of La and Pr in α-palladium whereas Ce and Y dissolve up to approximately 12 at. % at 900 °C. The lattice spacings and magnetic susceptibility results also indicate that the effective valency of the cerium atoms in the α-palladium solid solutions is close to that of α-cerium whereas, in the L 12 -type phase, CePd 3 , the effective valency of cerium is slightly in excess of that characteristic of γ-cerium.
102 citations
TL;DR: In this paper, a selection of hydrogenated palladium solid-solution alloys has been investigated by X-ray diffraction at room temperature, and the convergence of the lattice spacings of the a and β phases within the α/β miscibility gaps was determined in order to give the critical composition for the closure of the miscibility gap.
Abstract: A selection of hydrogenated palladium solid-solution alloys has been investigated by X-ray diffraction at room temperature. The convergence of the lattice spacings of the a and β phases within the α/β miscibility gaps was determined in order to give the critical composition for the closure of the miscibility gap at room temperature. The shape of the miscibility region showed considerable variation for the different alloy systems. The lattice expansion at the βmin boundary exhibited an approximately linear variation with the electron concentration, and the lattice expansion at the αmax boundary was thought to be influenced by the solid-solution strengthening of the particular alloy system. A line-broadening effect was observed which was ascribed to a pre-precipitation phenomenon.
78 citations