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- W2077736032 abstract "The vapor pressure of the impurity component above solid α-Ag-As and α-Ag-Bi alloys has been measured by means of the Knudsen method. Alloys with an impurity concentration as low as 0.1 at.% Bi could be studied. Values of the chemical excess potential are calculated. The excess potential is positive and increases monotonically in case of α-Ag-As, whereas in α-Ag-Bi a flat minimum is observed. These results, which are in good agreement with thermodynamic data from other noble metal systems with electropositve solutes, are explained theoretically. In addition the solubility curve of Bi in Ag has been redetermined. Deviations up to 50 K from the literature are found. Nous avons mesurè par la mèthode de Knudsen la pression de vapeur de l'impuretè au-dessus d'alliages solides Ag-Asα et Ag-Biα. On a pu ètudier des alliages dont la concentration en impuretè n'ètait que de 0,1% at. de bismuth. Nous calculons les valeurs du potentiel chimique en excès. Le potentiel en excès est positif et croît de façon monotone dans le cas de Ag-Asα, alors qu'on observe un minimum plat dans le cas de Ag-Biα. Nous expliquons thèoriquement ces rèsultats qui sont en bon accord avec les donnèes thermodynamiques obtenues pour d'autres systèmes de mètaux nobles avec des solutès èlectropositifs. De plus, nous avons fait une nouvelle dètermination de la courbe de solubilitè thermique de Bi dans Ag. Nous trouvons des ècarts allant jusqu'à 50 K par rapport aux courbes prècèdemment publièes. Über festen α-Ag-As und α-Ag-Bi Legierungen wurde der Dampfdruck der Fremdkomponente nach der Knudsenmethode gemessen. Dabei gelang es, Legierungen mit einem Fremdatomgehalt bis hinunter zu 0.1 at.% Bi zu untersuchen. Die Berechnung des chemischen Überschuβpotentials ergab ausschlieβlich positive Werte, die im Falle von α-Ag-As mit der Zulegierung monoton ansteigen und für a-Ag-Bi ein flaches Minimum andeuten. Dieser Befund stimmt mit thermodynamischen Daten von anderen Edelmetallsystemen sehr gut überein und läβt sich auch theoretisch gut verstehen. Eine im Rahmen dieser Arbeiten durchgeführte Neubestimmung der Soliduslinie in Ag-Bi ergab Abweichungen bis zu 50 K von bisher bekannten Literaturwerten." @default.
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- W2077736032 date "1988-03-01" @default.
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- W2077736032 title "Thermodynamic investigations of solid α-silver-arsenic and -bismuth alloys" @default.
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- W2077736032 doi "https://doi.org/10.1016/0001-6160(88)90095-8" @default.
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