Фазовая диаграмма системы Ce-W

К оглавлению: Другие диаграммы (Others phase diargams)

Ce-W (Cerium-Tungsten) S. Pandian, S.V. Nagender Naidu, and P. Rama Rao Available reports [64Gau, 66Den, 66Gau] concerning the solubility of W in liquid Ce are contradictory. For the temperature range 1537 to 2077 C, [66Den] reported an increase in solubility with temperature. The solubility values reported by [66Gau] are found to be considerably lower than those re ported by [66Den]. The solubility data of 0.0242 at.% W at 1537 C reported by [66Den] are preferred. A eutectic is also provisionally suggested for the Ce-W system at or just below the melting point of Ce. The eutectic composition is then the solubility of W in Ce at the melting point of Ce. According to [60Obr], the microexamination of this system revealed two intermetallic compounds, both of which are formed by a peritectic reaction. It was also reported that the W-rich compound is CeW2. No further reports are available to support these observations made by [60Obr]. Until more definitive studies are made, it is the present evaluators' assessment that no intermetallic compound is formed. According to the observation of [60Obr], solid W dissolves Ce, and the solubility decreases with temperature. However, this report is not supported by quantitative solubility data. Hence, until confirmatory studies are carried out, the solubility of Ce in (W) is considered to be negligible. There is no information available regarding the solid solubility of W in (Ce). 60Obr: W. Obrowski, Naturwissenschaften, 47,201-202, (1960). 64Gau: F. Gaume-Mahn and M. Blanchard, Bull. Soc. Chim. Fr., 196, 1103-1106 ( 1964) in French. 66Den: D.H. Dennison, M.J. Tschetter, and K.A. Gschneidner, Jr., J. Less- Common Met., 11, 423-435 (1966). 66Gau: F. Gaume-Mahn and C. Ait Yaha, Compt. Rend Acad. Sci. Paris, 262C, 1528- 1529 (1966) in French. Published in J. Alloy Phase Diagrams, 4(2), May 1988. Complete evaluation contains 1 figure, 3 tables, and 21 references. 1