Фазовая диаграмма системы Ag-Ca

К оглавлению: Другие диаграммы (Others phase diargams)


Ag-Ca (Silver-Calcium) M.R. Baren The assessed Ag-Ca equilibrium diagram is based on the data of [69Ale] for compositions between 0 and 50 at.% Ca and on the work of [70Pas] (as confirmed by [71Cam]) for compositions greater than 50 at.% Ca. The diagram is characterized by a lack of solid solution at either end. The compounds of Ag3Ca5 and AgCa3 were found by [69Ale], [70Pas], and [71Cam]. However, certain features of the equilibrium diagram determined by [69Ale] were probably in error due to sample contamination and, therefore, the data of [70Pas] and [71Cam] are presented for this region of the diagram. No data for this system were found for temperatures below about 470 C except for that of [69Ale]. They reported that DTA includes solid-state arrests between 70 and 98 at.% Ca at about 455 C. Given the uncertainty in the data for their alloys with high Ca concentrations, it is likely that these arrests correspond to the allotropic transformation of Ca. 62Ran: R.P. Rand and L.D. Calvert, Can. J. Chem., 40, 705-710 (1962). 69Ale: W.A. Alexander, L.D. Calvert, A. Desaulniers, H.S. Dunsmore, and D.F. Sargent, Can. J. Chem., 47(4), 611-614 (1969). 70Pas: B. Pascal, M. Caillet, and A. Michel, C.R. Acad. Sci., Ser. C, 270, 520- 522 (1970). 71Cam: A.N. Campbell and W.H.W. Wood, Can. J. Chem., 49(8), 1315-1316 (1971). 82Mer: F. Merlo, J. Less-Common Met., 86(2), 241-246 (1982). Published in Bull. Alloy Phase Diagrams, 9(3), Jun 1988. Complete evaluation contains 1 figure, 5 tables, and 12 references. Special Points of the Ag-Ca System