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Activity–Composition Relations in Platinum–Chromium and Platinum–Vanadium Alloys at 1500°C
Author(s) -
Pretorius Eugene B.,
Muan Arnulf
Publication year - 1992
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1992.tb04195.x
Subject(s) - vanadium , platinum , chromium , alloy , quenching (fluorescence) , microprobe , oxygen , electron microprobe , partial pressure , analytical chemistry (journal) , materials science , composition (language) , phase (matter) , metallurgy , chemistry , mineralogy , catalysis , biochemistry , physics , linguistics , organic chemistry , philosophy , chromatography , quantum mechanics , fluorescence
Activity–composition relations in Pt–Cr and Pt–V alloys at 1500°C were determined from equilibration of these alloys with Cr 2 O 3 and V 2 O 3 , respectively, in Co 2 –H 2 atmospheres of known oxygen partial pressures, followed by quenching to room temperature and microprobe analyses of the quenched alloys. The activities of Cr and V were calculated from known standard free energies of formation of Cr 2 O 3 and V 2 O 3 from the respective elements, and the oxygen pressures were calculated from the C–H–O equilibrium in the gas phase. Both alloy systems show strong negative deviations from Raoultian behavior.