Subsolidus phase relations in the systems CeO/sub 2/-RE/sub 2/O/sub 3/ (RE/sub 2/O/sub 3/ = C-type rare earth sesquioxide)

Journal Article · Wed Jul 15 04:00:00 EDT 1981 · J. Solid State Chem.; (United States)

DOI:https://doi.org/10.1016/0022-4596(81)90066-9· OSTI ID:6128740

Pepin, J G ^[1]; Vance, E R; McCarthy, G J

---

1. Pennsylvania State Univ., University Park

The systems CeO/sub 2/-RE/sub 2/O/sub 3/ (RE/sub 2/O/sub 3/ = C-type rare earth sesquioxide) were studied to: (1) investigate the claims of several workers for the existence of a complete solid solution series between CeO/sub 2/ and RE/sub 2/O/sub 3/; and (2) to characterize the weak C-type x-ray diffraction peaks reported by others from samples in the single-phase fluorite solid solution region. It is shown that a complete solid solution series does not exist, and an explanation for the observations of others reporting such is tendered. It is also shown that the observation of C-type reflections in the supposed single-phase fluorite field can be attributed to the partial reduction of Ce/sup 4 +/ to Ce/sup 3 +/ at the firing temperature, resulting in the movement of the bulk composition into a two-phase field of the CeO/sub 2/-RE/sub 2/O/sub 3/-Ce/sub 2/O/sub 3/ phase diagram, rather than the formation of a domain structure due to ordering.

• DOE Contract Number: AC09-79ET41900
• OSTI ID: 6128740
• Journal Information: J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 38:3; ISSN JSSCB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
DIFFRACTION
DYSPROSIUM COMPOUNDS
DYSPROSIUM OXIDES
ERBIUM COMPOUNDS
ERBIUM OXIDES
GADOLINIUM COMPOUNDS
GADOLINIUM OXIDES
HOLMIUM COMPOUNDS
HOLMIUM OXIDES
INDIUM COMPOUNDS
INDIUM OXIDES
LUTETIUM COMPOUNDS
LUTETIUM OXIDES
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
RARE EARTH COMPOUNDS
SCANDIUM COMPOUNDS
SCANDIUM OXIDES
SCATTERING
THULIUM COMPOUNDS
THULIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
YTTERBIUM COMPOUNDS
YTTERBIUM OXIDES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES