Abstract
Activity of aluminum in platinum-aluminum solid solution was determined by the electrochemical cell technique at temperatures ranging from 913 K to 1050 K. The following cell system was used: Pt-Al alloys, AlF 3 /CaF 2 /Co, CoF 2 The values of activity of Al, α Al , in Pt solid solution with 4.6 mol% Al and 9.4 mol% Al are, respectively, represented by: Pt-4.6 mol% Al: log α Al = -1.140-1.337 × 10 4 T -1 ±0.152 and Pt-9.4 mol% Al: log α Al =-3.167-1.083 × 10 4 T -1 ±0.102 The value of α Al in Pt-13.1 mol% Al alloy, which is comprised of the two-phase region of Pt(Al) solid solution and Pt 3 Al, is expressed as follows: Pt-13. 1 mol% Al: logα Al =-3.523-1.033 × 10 4 T -1 ±0.081.
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