Фазовая диаграмма системы C-Ce

К оглавлению: Другие диаграммы (Others phase diargams)

C-Ce (Carbon-Cerium) Editor The sesquicarbide, Ce2C3, is the metal-rich phase of the Ce-C system. Ce2C3 has the cubic Pu2C3-type structure with the I43d space group. Unlike La2C3, this sesquicarbide exhibits no solid solubility [58Spe], but like La2C3, it melts incongruently. An average melting temperature of 1505 C (taken from four studies) is in good agreement with the results of a systematic comparison with other RE2C3 compounds. The Ce-C phase diagram is redrawn from [Moffatt], which is essentially based on the information given above and a presumed similarity to the La-C system. At room temperature, CeC2 has a tetragonal structure of the CaC2-type with the I4/mmm space group. The high-temperature form has a cubic CaF2-type structure with the Fm3m space group. The composition of the CeC2-C eutectic was not reported. A CeC6 compound was reported by [80Elm], but the structure was not determined.-H.O. 58Spe: F.H. Spedding, K.A. Gschneidner, Jr., and A.H. Daane, J. Am Chem. Soc., 80, 4499 (1958). 80Elm: M. El Makrini, D. Gu‚rard, P. LaGrange, and A. H‚rold, Physica, 99B, 481 (1980). This supersedes the evaluation by K.A. Gschneidner, Jr. and F.W. Calderwood published in Bull. Alloy Phase Diagrams, 7(5), Oct 1986, which contains 1 table and 33 references. 1