Phase relation studies in the CeO{sub 2}-Gd{sub 2}O{sub 3}-ZrO{sub 2} system
- Applied Chemistry Division, Bhabha Atomic Research Centre, Mumbai-400 085 (India)
The phase relations in the CeO{sub 2}-Gd{sub 2}O{sub 3}-ZrO{sub 2} system have been established after slowly cooling the samples from 1400 deg. C. Ceria has been used as a surrogate material in place of plutonia. About 80 compositions in Zr{sub 1-x}Gd{sub x}O{sub 2-x/2}, Ce{sub 1-x}Gd{sub x}O{sub 2-x/2}, Ce{sub 1-x}Zr{sub x}O{sub 2.00} (Zr{sub 0.5}Ce{sub 0.5}){sub 1-x}Gd{sub x}O{sub 2-x/2}, (Ce{sub 0.5}Gd{sub 0.5}){sub 1-x}Zr{sub x}O{sub 1.75+x/4} (Zr{sub 0.5}Gd{sub 0.5}){sub 1-x}Ce{sub x}O{sub 1.75+x/4}, and (Ce{sub 0.8}Zr{sub 0.2}){sub x}Gd{sub 1-x}O{sub 1.5+x/2} were prepared by a three steps heating protocol. Based on the refinement of the XRD data, several phase regions namely; cubic fluorite type solid solution, C-type solid solution, and various biphasic regions could be delineated. This system showed the existence of a very wide cubic phase field. About 17.5 mol% GdO{sub 1.5} was found to fully stabilize the cubic zirconia. On the other hand ceria did not stabilize the cubic zirconia. The anion-excess gadolinia, i.e., Gd{sub 1-x}Ce{sub x}O{sub 1.5+x} was found to retain the C-type lattite unlike pure gadolinia. The ternary phase relations were mainly characterized by the presence of wide homogeneity ranges of fluorite type or C-type phases.
- OSTI ID:
- 20658198
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 11 Vol. 177; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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