Search for the most stable PdSiCu metallic glass using the phase diagram approach

Massalski, T. B.; Kim, Young‐Won; Vassamillet, L. F.; Hopper, Robert

doi:10.1016/0025-5416(81)90043-4

Cited by 16 publications

(7 citation statements)

References 2 publications

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“…1,2,17,18 Among them, when compared to conventional Pd systems, a high passivation potential and lower passivation current density is observed for almost all Pd-based metallic glasses (MGs) containing Cu. 19,20 The change in the passivation kinetics can be mainly linked with the glass-forming characteristics of these compositions. In general, metallic glasses possess an exclusive collection of properties, i.e., excellent mechanical strength and hardness together with high wear and fatigue resistance.…”

Section: Introductionmentioning

confidence: 99%

“…Although Pd in element form suffices the critical properties for optimum hydrogen storage, i.e., rapid sorption kinetics, high volumetric gas storage, and high reversibility, etc., its application field is fairly limited because of its relatively high price and moderate affinity to oxidizing or reducing environments under extreme conditions . Hence, to lower the costs and increase the durability, Pd alloys and composites have been widely investigated and employed in the past decade. ,,, Among them, when compared to conventional Pd systems, a high passivation potential and lower passivation current density is observed for almost all Pd-based metallic glasses (MGs) containing Cu. , The change in the passivation kinetics can be mainly linked with the glass-forming characteristics of these compositions. In general, metallic glasses possess an exclusive collection of properties, i.e., excellent mechanical strength and hardness together with high wear and fatigue resistance. − Moreover, similar to thermoplastics, MGs can be easily formed into complex geometries even under atmospheric pressure at relatively low temperatures. − …”

Section: Introductionmentioning

confidence: 99%

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Electrosorption of Hydrogen in Pd-Based Metallic Glass Nanofilms

Sarac

Karazehir

Mühlbacher

et al. 2018

ACS Appl. Energy Mater.

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As an efficient potential hydrogen storage and conversion system, hydrogen electrosorption and evolution mechanisms in Pd-based metallic glass thin films (MGTFs) are investigated. In this study, thin films of 55 nm thickness were deposited by dc magnetron sputtering. The amorphous structure of MGTFs and the atomically smooth interface between the MGTF and substrate were confirmed by transmission electron microscopy, whereas the compositiondependent surface roughness was obtained via atomic force microscopy. The shifts in the broad diffraction maxima for the Si and Cu additions were evaluated by X-ray diffraction. The Pd thin film (PdTF) and MGTF working electrodes were chronoamperometrically saturated in 0.5 M H 2 SO 4 solution. The formation of palladium hydride (PdH x ) in the MGTFs was investigated by X-ray photoelectron spectroscopy. Cyclic voltammograms were subsequently recorded (between −0.2 and 1.4 V) at sweep rates of 0.02 V s −1 . Electrochemical impedance spectroscopy of MGTFs and PdTF was performed in full spectrum including sorption, desorption, and evolution of hydrogen in a conventional three-electrode configuration. Electrochemical circuit modeling provided the relationship between the composition-dependent hydrogen evolution and H absorption/adsorption processes. The adsorption capacitance parameter Y ad corresponding to αand β-hydride formation in the case of Pd 0.79 Si 0.16 Cu 0.05 MGTF is ∼5 times higher than that of the crystalline Pd thin film which is in line with the decrease in the charge-transfer resistance R ct . Addition of Cu disturbs the symmetry of the glass formers, leading to remarkable changes in interfacial hydrogen bonding and diffusion of hydrogen into sublayers. Compared to other Pd-based micron-sized materials, our findings show excellent volumetric hydrogen storage capacity 4 times higher than that of the traditional counterparts of several microns, and 50% higher than the Pd thin films of the same thickness, together with high tunable capacitance, charge-transfer resistance, and diffusivity depending on the glass-forming characteristics of the nanosized MGTF.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrosorption of Hydrogen in Pd-Based Metallic Glass Nanofilms

Sarac

Karazehir

Mühlbacher

et al. 2018

ACS Appl. Energy Mater.

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“…12,15 Cu containing PdSi-based metallic-glass (MG) nanofilms can serve as a remedy to this problem by showing higher durability against severe environments due to their grain-free amorphous structure while significantly decreasing the cost due to the substitution of Pd with Si and Cu. 16 In our previous study, the electrosorption (adsorption, absorption, desorption, and evolution) behaviour of hydrogen and kinetic parameters such as charge transfer resistance, as well as the double layer and adsorption capacitance were investigated using a combination of cyclic voltammetry and electroimpedance spectroscopy. 17 Depending on the Cu content, PdSi-based metallic glass nanofilms can remarkably enhance metal-hydrogen interaction and palladium hydride (PdH x ) formation.…”

mentioning

confidence: 99%

Ultrahigh hydrogen-sorbing palladium metallic-glass nanostructures

et al. 2019

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“…The sample was totally crystallized after annealing at 875 K which gives a heterogenous, fine grain sized specimen [26]. Nevertheless, the model developed for hydrogen solubility in amorphous alloys [12] was used for this crystallized sample because sites avail able for hydrogen atoms will have different energies in the different phases and in the grain boundaries.…”

Section: Solubility Changes After Annealing Amorphous Pd 17 5 Cu 6 mentioning

confidence: 99%

Hydrogen in Amorphous Metals—i

KIRCHHEIM

SOMMER

SCHLUCKEBIER

1986

Perspectives in Hydrogen in Metals

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The solubility and diffusivity of hydrogen in amorphous Pd 77 5 Cu 6 Si 16>5 and Ni 4 9.9Pd 31 8 P Î 8 3 have been measured using an electrochemical method. The pressure-concentration isotherms show remarkable deviations from Sievert's Law while the amount of hydrogen dissolved lies in between the solubility of the components of the alloy. The diffusivity of hydrogen is rather high (about 10~8 cm 2 /s) and it depends on temperature and also on concentration even at very low hydrogen levels contrary to crystalline metals. A consistent interpretation of the results is given within the framework of a Fermi-Dirac statistics, developed and used recently for the interaction of hydrogen with defects in solids. Equivalent to electrons in metals, hydrogen is distributed among sites of different energy caused by the disorder in an amorphous metal. The density of sites of a definite energy is assumed to be a Gaussian function. An equation is derived which relates the width of this function to the width of the radial distribution function which describes the structure of an amorphous alloy. Changes in this structure are believed to take place during annealing and were revealed by changes of hydrogen solu bility.Résumé-Nous avons mesuré à l'aide d'une méthode électrochimique la solubilité et la diffusivité de l'hydrogène dans Pd 77>5 Cu 6 Si 16<5 et Ni 49 Pd3 1<8 P 18 ,3. Les isothermes pression-concentration présentent des écarts remarquables par rapport à la loi de Sievert, alors que la solubilité de l'hydrogène est comprise entre celles pour les constituants de l'alliage. La diffusivité de l'hydrogène est assez élevée (environ 10 _8 cm 2 /s); elle dépend de la température, mais aussi de la concentration, même pour les faibles teneurs en hydrogène, contrairement à ce qu'on observe dans les métaux cristallins. Nous présen tons une interprétation cohérente de ces résultats dans le cadre d'une statistique de Fermi et Dirac développée et utilisée récemment pour l'interaction entre l'hydrogène et les défauts dans les solides. Comme les électrons dans un métal, l'hydrogène est réparti sur des sites dont les énergies sont différentes dan le métal amorphe du fait du désordre. Nous avons supposé que la densité de sites d'une énergie donnée suivait une fonction de Gauss. Nous avons obtenu une équation reliant la largeur de cette fonction à la largeur de la fonction de répartition radiale qui décrit la structure d'un alliage amorphe. Nous pensons que des changements de cette structure se produisent au cours du recuit et qu'ils sont révélés par les variations de la solubilité de l'hydrogène. Zusammenfassung-DieLöslichkeit und Beweglichkeit von Wasserstoff in amorphen Pd 77 5 Cu 6 Si 165 und Ni 4 9.9Pd3 1<8 P 18i 3 wurde mit Hilfe einer elektrochemischen Methode gemessen. Die Druck-Konzen trations-Isothermen zeigen deutliche Abweichungen vom Sievert'schen Gesetz, wobei die Wasserstofflöslichkeit zwischen den Löslichkeiten der Legierungskomponenten liegt. Die Diffusionskonstante des Was serstoffes ist recht hoch (bei 10" 8 cm 2 /s) und s...

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Search for the most stable PdSiCu metallic glass using the phase diagram approach

Cited by 16 publications

References 2 publications

Electrosorption of Hydrogen in Pd-Based Metallic Glass Nanofilms

Electrosorption of Hydrogen in Pd-Based Metallic Glass Nanofilms

Ultrahigh hydrogen-sorbing palladium metallic-glass nanostructures

Hydrogen in Amorphous Metals—i

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