Pressure-induced changes in L/sub III/ x-ray-absorption near-edge structure of CeO/sub 2/ and CeF/sub 4/: Relevance to 4f-electronic structure

Journal Article · Mon Nov 14 23:00:00 EST 1988 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.38.10174· OSTI ID:6743772

Kaindl, G; Schmiester, G; Sampathkumaran, E V; Wachter, P

X-ray-absorption near-edge structure (XANES) studies were performed at the L/sub III/ thresholds of CeO/sub 2/ and CeF/sub 4/ as a function of external pressure up to approx. =267 kbar at room temperature. In both cases, the 4f/sup 0/-related higher-energy component of the essentially double-peaked XANES structure decreases in relative intensity with pressure, opposite to what is generally observed for metallic mixed-valent Ce compounds. This supports the proposed peak assignment on the basis of core-hole induced many-body effects due to 4f-ligand covalency compatible with traditional tetravalency of these compounds.

• Research Organization: Institut fuer Atom- und Festkoerperphysik, Freie Universitaet Berlin, D-1000 Berlin 33, Germany
• OSTI ID: 6743772
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 38:14; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ABSORPTION SPECTRA
CERIUM COMPOUNDS
CERIUM FLUORIDES
CERIUM OXIDES
CHALCOGENIDES
ELECTRONIC STRUCTURE
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
MEDIUM TEMPERATURE
OXIDES
OXYGEN COMPOUNDS
PRESSURE DEPENDENCE
RARE EARTH COMPOUNDS
SPECTRA
VALENCE
VERY HIGH PRESSURE
X-RAY SPECTRA