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The diffusivity of hydrogen in the noble metals at low temperature

โœ Scribed by T. Ishikawa; R.B. McLellan


Publisher
Elsevier Science
Year
1985
Weight
811 KB
Volume
33
Category
Article
ISSN
0001-6160

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โœฆ Synopsis


An electrolytic method has been used to measure the digusivity of hydrogen in the noble metals Pt, Au, and Ag in the low-temperature range 280-330K. The data obtained have been considered in UJnjunction with those for ather noble metals (Pd and Cu) in order to draw conclusions concerning the interactions between dissolved II-atoms and lattice vacancies. It has been concluded that, at least in Pd, Cu, and Au, the W-vacancy interaction energy is too low to render diffusion anomalies observable at high temperatures. This is in accord with theoretical calculations based on the effective medium technique. R&n6-Nous avons utili& une m&&ode tkctroiytique pour mesurer la dillirsiviti de l'hydrog&re dans ks m&aux nobks Pt, Au et Ag dans k r&me de basses ternI&atures, entre 280 et 330 IL Nous avow tenu compte de ces rlsultats et d'autres concernant d'autres m&aux nobles (Pd et Cu) Pour tirer des conclusions sur ks interactions entre lea atomes d'hydrog&ne dissous et Ies lacunes du r&au. Nous en concluons que, au moins darts Pd, Cu et Au, I'tnergie d'interaction H-lacune est trop faibk pour que les anomalies de dii%sion puissent 2tre observabks & haute te&rature. Ceci est en accord avec des calculs thcOriques bases sur la technique du milieu effectif. Zusammanfaasnng-Mit ,einer elektrolytischen Methode wurde der DiffusionskoeBdent van WasserstotT in den Edebnetailen Pt. Au und Ag im Ternperaturbereich Zwischen 280 und 330 K gemessen. Die erhaltenen Ergebnisse werden zusanunen mit anderen Daten an Pd und Cu diskutiert, urn Aufschlu5 iiber die Wechselwirkung zwischen den gel&ten H-Atomen und den Gitterleerstellen zu crhalten. Es ergibt sich, da5 die Wecbmbvirkungsenergie zwischcn H und Leerstelle wenigstens in Pd, Cu und Au zu klein ist, urn zu den bei h6herer Temperatur bcobachteten Diffusionsanotnalien fiihren zu k&men. Dieses Ergebnis stimmt mit theoretischen Rechnungen anhand eines effektiven Mediums uberein.


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