Фазовая диаграмма системы Au-Ce

К оглавлению: Другие диаграммы (Others phase diargams)


Au-Ce (Gold-Cerium) K.A. Gschneidner, Jr., F.W. Calderwood, H. Okamoto, and T.B. Massalski The assessed diagram for the Ce-Au system is based primarily on the work of [ 43Vog], with modifications on the Au-rich side based on the work of [71Mcm]. The melting temperature for Ce has been raised 21 C to 798 C to bring it into agreement with the accepted values [Gschneidner]. CeAu2 forms peritectically from the melt and solid bCeAu on cooling at 665 C. Ce2Au has the orthorhombic structure of the Co2Si type. A eutectic occurs between Ce2Au and gCe at ~520 C with Au content of about 16 at.%. CeAu melts congruently at 1372 с 10 C. This compound exists in two orthorhombic forms: the low-temperature form has the FeB structure, with the transformation from the high-temperature CrB-type structure occurring during cooling at 480 с 10 C. Like LaAu and unlike all other Au-rare earth compounds, Ce-Au does not exist in a CsCl-type cubic structure. CeAu2 melts congruently at 1130 C. It has the orthorhombic CeCu2-type structure and forms a eutectic with bCeAu at 995 C containing 61.3 at.% Au. Ce14Au51 forms a eutectic with CeAu2 at 1025 C and ~69 at.% Au. The Au-rich compound is CeAu6, which is the product of a peritectic reaction between the melt and Ce14Au51. A eutectic occurs between Au and CeAu6 at 808 C containing about 90.5 at.% Au. 43Vog: R. Vogel and T. Heumann, Z. Metallkd., 35, 29 (1943). 71Mcm: O.D. McMasters, K.A. Gschneidner, Jr., G. Bruzzone, and A. Palenzona, J. Less-Common Met., 25, 135 (1971). Published in Phase Diagrams of Binary Gold Alloys, 1987. Complete evaluation contains 1 figure, 1 table, and 14 references. 1