High-temperature Thermodynamic Activities of Zirconium in Platinum Alloys Determined by Nitrogen-nitride Equilibria
Author | : |
Publisher | : |
Total Pages | : |
Release | : 1980 |
ISBN-10 | : OCLC:727185605 |
ISBN-13 | : |
Rating | : 4/5 (05 Downloads) |
Book excerpt: A high-temperature nitrogen-nitride equilibrium apparatus is constructed for the study of alloy thermodynamics to 2300°C. Zirconium-platinum alloys are studied by means of the reaction 9ZrN + 11Pt .-->. Zr9Pt11 + 9/2 N2. Carful attention is paid to the problems of diffusion-limited reaction and ternary phase formation. The results of this study are and a/sub Zr/1985sup 0/C/ = 2.4 x 10−4 in Zr9Pt11 .delta. G/sub f 1985°C/° Zr9Pt11 less than or equal to -16.6 kcal/g atom. These results are in full accord with the valence bond theory developed by Engel and Brewer; this confirms their prediction of an unusual interaction of these alloys.