Фазовая диаграмма системы Ce-Ir

К оглавлению: Другие диаграммы (Others phase diargams)


Ce-Ir (Cerium-Iridium) H. Okamoto The Ce-Ir phase diagram is based on the work of [73Dmi], who studied the system with metallographic, X-ray, and melting point investigations. Based on recent crystal structure data, "Ce2Ir" in [73Dmi] is shown as Ce5Ir3, and Ce7Ir3 is added to the assessed phase diagram. The equilibrium phases of the Ce-Ir system are (1) the liquid, L; (2) the W-type terminal solid solution, ( dCe); (3) the Cu-type terminal solid solution, (gCe); (4) the aLa-type terminal solid solution, (bCe); (5) the Cu-type terminal solid solution, (aCe); (6) Ce4Ir, with an unknown crystal structure; (7) Ce3Ir, with an unknown crystal structure; (8) Fe3Th7-type Ce7Ir3; (9) Pu5Rh3-type Ce5Ir3; (10) Ge4Sm5- type Ce5Ir4; (11) Cu2Mg-type CeIr2, with a homogeneity range of ~7 at.%; (12) PuNi3-type CeIr3; (13) Ce2Ni7-type Ce2Ir7; (14) AuBe5-type CeIr5; and (15) the fcc terminal solid solution, (Ir). The existence of RE7Ir3-type phases was established for RE = La, Ce, and Pr by [73Olc], although Ce7Ir3 was not shown in [73Dmi]. The crystal structure of Ce5Ir3 was established by [80Mor]. The existence of "Ce2Ir" and "Ce3Ir2" was reported near Ce5Ir3. Because RE5Ir3 occurs in all RE-Ir systems, and neither RE2Ir nor RE3Ir2 has been found for any other RE elements (RE = light lanthanide), the Ce5Ir3 stoichiometry is accepted. The crystal structure of Ce5Ir4 (44.4 at.% Ir) was established by [76Ram]. 59Com: V.B. Compton and B.T. Matthias, Acta Crystallogr., 12, 651-654 (1959). 65Geb: T.H. Geballe, B.T. Matthias, V.B. Compton, E. Corenzwit, G.W. Hull, Jr., and L.D. Longinotti, Phys. Rev. A, 137(1), 119-127 (1965). 71Kri: N.H. Krikorian, J. Less-Common Met., 23, 271-279 (1971). 73Dmi: V.N. Dmitrieva, T. Resukhina, L. Varekha, L. Kravchenko, V. Vorob'ev, B. Gusienin, V. Domashev, and V. Melnikova, Metallofizika, 49, 109-117 (1973) in Russian. 73Olc: G.L. Olcese, J. Less-Common Met., 33(1), 71-81 (1973). 74Vor: V.D. Vorob'ev and V.A. Mel'nikova, Kristallografiya, 19(3), 642-644 ( 1974) in Russian; TR: Sov. Phys. Crystallogr., 19(3), 397. 76Ram: A. Raman, J. Less-Common Met., 49, 111-117 (1976). 80Mor: J.M. Moreau, D. Paccard, and J. Le Roy, Acta Crystallogr. B, 36, 912- 914 (1980). Submitted to the APD Program. Complete evaluation contains 1 figure, 2 tables, and 9 references. 1