Фазовая диаграмма системы As-Mo

К оглавлению: Другие диаграммы (Others phase diargams)


As-Mo (Arsenic-Molybdenum) L. Brewer and R.H. Lamoreaux Because no phase diagrams were found in the literature, the assessed phase diagram for the Mo-As system was obtained by thermodynamic modeling based on estimated thermodynamic equations. The molybdenum arsenide phases consist of Mo5As4, Mo2As3, and MoAs2. No evidence exists of significant homogeneity ranges for the intermediate phases or for the elements; any homogeneity range would be less than 2 to 3% in extent. [64Bol] indicated the existence of the phase Mo49As51, which is reported to be stable at 700 C and unstable at 1100 C. [75Gue] has shown that the MoAs phase can be stabilized at 1050 to 1250 C by adding FeAs and other arsenides, but phases with more than 95% MoAs are unstable at these temperatures. The present evaluators consider MoAs to be a metastable phase that is stable up to 500 to 600 C. MoAs5 has been reported by [65Bro]. 64Bol: H. Boller and H. Nowotny, Monatsh. Chem., 95, 1272 (1964). 65Bro: A. Brown, Nature (London), 206, 502-503 (1965). 75Gue: R. Guerin, M. Sergent, and J. Prigent, C.R. Hebd. Acad. Sci., Ser. C, 274, 1278 (1972); TR: Mater. Res. Bull., 10, 957-966 (1975). Published in Bull. Alloy Phase Diagrams, 1(2), Dec 1980. Complete evaluation contains 1 figure, 2 tables, and 21 references. 1