Thermodynamics of Hydrogen Dissolved in Pd‐Tb and Pd‐Dy Alloys

Chen, F. L.; Sakamoto, Yasuhisa; Flanagan, F. B.

doi:10.1002/bbpc.19930970607

Cited by 12 publications

(2 citation statements)

References 52 publications

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“…Figure 2 shows the pressure-composition isotherms for the same alloy in the ranges 30 T ( • C) 200 and 1 P (bar) 40. The isotherms of this alloy exhibit a wavy plateau whereas those of the pure Pd element show a horizontal plateau [9]. This may be attributed to the inhomogeneities of the ternary alloy composition.…”

Section: P-c Isothermsmentioning

confidence: 84%

“…The P -C isotherms show higher plateau pressures with increase in Ni content, together with an increase in the plateau width. Hydrogen absorption studies on Pd 1−x Dy x for various concentrations of Dy show an increase in the low-pressure hydrogen concentration and a decrease in the miscibility gap with increasing Dy content [9]. The relative partial molar enthalpy and relative partial molar entropy at infinite dilution become more negative with increasing concentration of Dy.…”

Section: Introductionmentioning

confidence: 96%

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Solubility of hydrogen in Pd-Dy-Ni ternary alloys

Anuradha¹,

Sivakumar²,

Ramaprabhu

2001

J. Phys.: Condens. Matter

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The hydrogen solubility properties of solid-solution ternary Pd 1−x−y Dy x Ni y (x = 0.020, 0.040; y = 0.0555, 0.111) alloys are investigated in the ranges 473 T (K) 873 and 0.05 P (bar) 25 respectively. From the lattice parameters of the alloys and the thermodynamic parameters of the alloyhydrogen 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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Section: P-c Isothermsmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 96%

Solubility of hydrogen in Pd-Dy-Ni ternary alloys

Anuradha¹,

Sivakumar²,

Ramaprabhu

2001

J. Phys.: Condens. Matter

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Hydrogen absorption and thermodynamic properties of hydrogen in low rh content Pd‐Rh alloys

Sakamoto

Haraguchi

Ura

et al. 1994

Ber Bunsenges Phys Chem

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The hydrogen absorption characteristics of fully annealed Pd‐Rh alloys containing up to 10.0 at.% Rh have been investigated at temperatures between 273 K and 433 K and hydrogen pressures up to 1000 Torr by means of pressure‐composition isotherm measurements. For the p‐c isotherms of Pd‐7.5 at.% Rh alloy, in addition to the normal (α+β) two‐phase plateaus, “anomalous plateaus” are observed near the normal βmin phase boundaries. The formation of this anomalous plateau implies that in the fully annealed alloys some precursory phase separation exists, together with the metastable, homogeneous solid solution phase. The low pressure hydrogen solubilities decrease with an increase of Rh content and the main plateau pressures increase with the solute metal content. The hydrogen solubilities exhibit a maximum at about 7.5 at.% Rh at 1000 Torr. The derived relative partial molar thermodynamic quantities at infinite dilution, and also the plateau thermodynamic parameters are in agreement with the previously reported results. These thermodynamic quantities are not affected by the formation of the anomalous hydride phase, because the hydride does not form in the dilute phase region, and because the amount of hydrogen involved in the anomalous hydride phase is small compared to the main hydride phase.

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Thermodynamic Properties for Solution of Hydrogen in Palladium‐Based Binary Alloys

Sakamoto

Chen

Ura

et al. 1995

Ber Bunsenges Phys Chem

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The thermodynamic parameters for solution of hydrogen at infinite dilution and the (a+B) plateau thermodynamic properties for hydrogen absorption at moderate temperatures for a series of Pd‐based f.c.c binary alloys with relatively low solute metal content have been correlated from the viewpoint of whether the alloy lattice is expanded or contracted to parent Pd lattice. Newly determined data for Pd‐Zn, Pd‐Sb, Pd‐Bi, Pd‐Cr, Pd‐Mo and Pd‐Mn alloys are included. When alloys with solute metals in the same groups are compared, the lattice parameters of Pd binary alloys with the 4 d and 5 d transition elements are, in general, larger than those with the 3 d elements. The relative partial molar enthalpy, ΔH0H, at infinite dilution becomes more exothermic with an increase of lattice parameter for the lattice‐expanded alloys with the exception of Pd‐Pt alloys. Conversely, for contracted alloys, with the exceptions of Pd‐Li, Pd‐Zn, Pd‐Al and low Ti content Pd‐Ti alloys, the enthalpy becomes less exothermic with increasing lattice contraction. The dilute phase solubility at the same temperature as reflected by the relative chemical potential of dissolved hydrogen at infinite dilution, Δμ0H, increases with increasing lattice expansion for the expanded alloys, with the exceptions of Pd‐Pt and Pd‐Nb (Ta), whereas for the contracted alloys, the solubility decreases with increasing lattice contraction, with the exception of the Pd‐Li alloys. The standard free energy change, ΔG0plat' for B‐hydride formation in the expanded alloys decreases with increase of lattice expansion with the exceptions of the Pd‐Pt, Pd‐Zr, Pd‐Sb, Pd‐Nb(Ta) and Pd‐Mn alloys. For the contracted alloys, the B‐hydride becomes less stable with increasing lattice contraction except for the Pd‐Li alloys. The isobaric hydrogen solubilities in Pd alloys at relatively high pressures may be attributed to the influence of the solute metal atoms on the Pd band structure and to the exclusion of H from site occupation due to solute atoms in the nearest neighbor shells; both of these effects are independent of the lattice expansion and contraction.

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Thermodynamics of Hydrogen Dissolved in Pd‐Tb and Pd‐Dy Alloys

Cited by 12 publications

References 52 publications

Solubility of hydrogen in Pd-Dy-Ni ternary alloys

Solubility of hydrogen in Pd-Dy-Ni ternary alloys

Hydrogen absorption and thermodynamic properties of hydrogen in low rh content Pd‐Rh alloys

Thermodynamic Properties for Solution of Hydrogen in Palladium‐Based Binary Alloys

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