Phase relations, lattice thermal expansion in Ce1−xEuxO2−x/2 and Ce1−xSmxO2−x/2 systems and stabilization of cubic RE2O3 (RE: Eu, Sm)

✍ Scribed by Balaji P. Mandal; V. Grover; A.K. Tyagi

• Book ID: 103841755
• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 227 KB
• Volume: 430
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2006.05.140

✦ Synopsis

The phase relations in CeO 2 -Eu 2 O 3 and CeO 2 -Sm 2 O 3 systems have been established under slow-cooled conditions from 1400 • C. The twophase relations differ as the CeO 2 -Eu 2 O 3 system showed only two monophasic phase fields, namely F-type cubic and C-type cubic, whereas CeO 2 -Sm 2 O 3 system showed three phase fields namely F-type cubic, C-type cubic and a biphasic field comprising of C-type cubic and monoclinic phase. An interesting observation of this investigation is the stabilization of C-type rare-earth oxide after Ce 4+ substitution, which is attributed to decrease in average cationic size on Ce 4+ substitution at RE 3+ site. The lattice thermal expansion behavior of F-type solid solution and C-type solid solution in CeO 2 -Eu 2 O 3 system was investigated by high-temperature XRD.