Electronic properties and stability of the ordered Pd-Y alloys

Kuentzler, R.; Loebich, O.

doi:10.1016/0022-5088(85)90271-1

Cited by 16 publications

(5 citation statements)

References 20 publications

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“…The calculated invariant equilibria in the Pd-Y system are listed in Table 2, where the largest uncertainty is about 4 • C in the invariant temperature of the reaction Liq ↔ Pd 2 Y 5 + Pd 2 Y 3 In the reaction Liq ↔ Pd 2 Y 5 + Pd 2 Y 3 , the uncertainty in the invariant temperature is about 13 • C [11]. In view of the estimated experimental 04032-p.3 errors (about 1-2 at.…”

Section: Resultsmentioning

confidence: 99%

“…Loebich and Raub [7] indicated the presence of polymorphic transformation and a small range of homogeneity for PdY (51-52 at.% Y). Considering, however, the subsequent work of Kuentzler and Loebich [11] and Palenzona and Cirafici [13], the homogeneity range of PdY should be 50-51 at.% Y and the maximum melting point attributed to the ideal 50 at.% Y composition [14].…”

Section: Review Of Experimental Datamentioning

confidence: 99%

“…The results obtained have been taken by Massalski [22] to draw a phase diagram. Kuentzler and Loebich [11] presented a revised phase diagram and discussed the stability of the existing ordered structures. The homogeneity range of the intermetallic compound Pd 3 Y and the solubility of Y in f.c.c.…”

Section: Review Of Experimental Datamentioning

confidence: 99%

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Thermodynamic assessment of the Pd–Y binary system

Kardellass

Selhaoui

Iddaoudi

et al. 2013

MATEC Web of Conferences

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Abstract. The Pd-Y system was critically assessed using the CALPHAD technique. The solution phases (liquid, b.c.c., f.c.c. and h.c.p.) were modeled using the Redlich-Kister equation. The intermetallic compounds Pd 3 Y and PdY, which have homogeneity ranges, were treated as the formula (Pd, Y) 0.75 (Pd, Y) 0.25 and (Pd, Y) 0.5 (Pd, Y) 0.5 by a two-sublattice model with a mutual substitution of Pd and Y on both sublattices. The optimization was carried out in two steps. In the first treatment, Pd 3 Y and PdY are assumed to be stoichiometric compounds; in the second treatment they are treated by a sublattice model. The parameters obtained from the first treatment were used as starting values for the second treatment. The calculated phase diagram and the thermodynamic properties of the system are in satisfactory agreement with the experimental data.

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Section: Resultsmentioning

confidence: 99%

Section: Review Of Experimental Datamentioning

confidence: 99%

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Thermodynamic assessment of the Pd–Y binary system

Kardellass

Selhaoui

Iddaoudi

et al. 2013

MATEC Web of Conferences

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“…The phase diagram of the Pd-Y alloys is quite complicated and many stoichiometric phases can be formed between the two metals. 31,32 Also, the two solid-phase solution regions ͑Pd in Y and vice versa͒ do exist at the two beginning compositions of the corresponding alloys. Similar to Ref.…”

Section: Discussionmentioning

confidence: 96%

“…31,32 Also, the two solid-phase solution regions ͑Pd in Y and vice versa͒ do exist at the two beginning compositions of the corresponding alloys. Similar to Ref.…”

Section: Discussionmentioning

confidence: 97%

Hydrogenation Behavior of Yttrium Thin-Film Electrode in 1 M NAOH Electrolyte after Removal of Palladium Cap

Matveeva

Parkhutik

2004

J. Electrochem. Soc.

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Electrochemical loading/release of hydrogen into a thin-film yttrium ͑Y͒ electrode ͑200 nm͒ capped with a Pd protective layer ͑20 nm͒ is reported and compared with the behavior of the same electrode after removal of the protection. The system is of interest for the development of rare-earth based optical switchable devices. The stripping procedure was done on the previously cycled electrode when the uppermost protective Pd layer had been detached from the yttrium film. The Pd detachment as shown by scanning electron microscopy and chemical analysis of the different areas of the surface made it evident that a Pd remnant was still present on the electrode ͑5-7 nm͒. The electrochemical behavior of such a stripped Y electrode was stable but different from the former protected one and optical switching was observable as well. We discuss the role of the surface protection in optical devices based on hydrides, materials and morphology, and oxidation of the active metal ͑yttrium in our case͒ after the protection failure. It is proposed to use the Pd-containing alloys developed for hydrogen permeation systems in the form of surface patches/gates for hydrogen uptake into the active material and oxidize the rest of the surface to prevent it from further alteration.The recent discovery of optical switching in yttrium and other rare earth metal/alloy hydrides has stimulated an interest in studies of the kinetics and mechanism of this phenomenon with the purpose of employing this effect for optical switching devices. 1-8 In the case of yttrium ͑Y͒ the reversible optical changes are attained between the di-YH 2Ϫ␤ ͑␤-phase͒ and tri-YH 3Ϫ␥ ͑␥-phase͒ hydrides due to the metal ͑reflecting state͒-semiconductor ͑transparent state͒ transition. Yttrium also posseses the ␣-YH ϳ0.2 phase, or solid solution of hydrogen in the yttrium lattice, which does not play a role in the switchable devices. Hydrogenation of the active metal/alloy can be performed in either hydrogen gas or solution, though the latter ͑when performed under electrochemical control͒ seems to be more reliable.Hydrogenation in a liquid phase is accompanied by some problems, and one of them is the high chemical activity of the rare earth metals 9 toward aqueous electrolytes. The reactivity of yttrium leads to oxidation and transformation of the active layer to either an oxide phase or to complete dissolution. [10][11][12][13] To overcome this uncontrollable and irreversible yttrium oxidation, a protective ͑capping͒ Pd layer was proposed and employed in previous work. The choice was based on the well-known properties of Pd which allow hydrogen transport and its use as a hydrogen membrane. 14 The hydrogenation of Pd was studied in detail ͑for a review, see Ref. 14͒, and it was recognized that this metal posseses the two hydrides, an ␣-phase of a solid-state solution with a H content up to 0.05; and a ␤-phase or true hydride with H content close to 0.7. The electrochemical hydrogen loading into the bimetallic electrode ͑yt-trium covered by a thin palladium cap͒ was studied in ...

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ChemInform Abstract: ELECTRONIC PROPERTIES AND STABILITY OF THE ORDERED PALLADIUM‐YTTRIUM ALLOYS

Kuentzler¹,

Loebich²

1985

Chemischer Informationsdienst

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Electronic properties and stability of the ordered Pd-Y alloys

Cited by 16 publications

References 20 publications

Thermodynamic assessment of the Pd–Y binary system

Thermodynamic assessment of the Pd–Y binary system

Hydrogenation Behavior of Yttrium Thin-Film Electrode in 1 M NAOH Electrolyte after Removal of Palladium Cap

ChemInform Abstract: ELECTRONIC PROPERTIES AND STABILITY OF THE ORDERED PALLADIUM‐YTTRIUM ALLOYS

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