High pressure and temperature equation of state and spectroscopic study of CeO 2
One of the most widely used x-ray standards and a highly applied component of catalysis systems, CeO2 has been studied for the purpose of better understanding its equation of state and electronic properties. Diamond anvil cells have been used to extend the equation of state for this material to 130 GPa and explore the electronic behavior with applied load. From the x-ray diffraction studies, it has been determined that the high pressure phase transition extends from approximately 35 to 75 GPa at ambient temperature. Elevation of temperature is found to decrease the initiation pressure for this transition, with multiple distinct temperature regions which indicate structural related anomalies. In addition, hydrostatic and non-hydrostatic effects are compared and exhibit a drastic difference in bulk moduli. The electronic results indicate a change in the scattering environment of the cerium atom, associated with the high pressure phase transition. Overall, these results present the first megabar pressure study and the first high pressure and temperature study of ceria. Additionally, this shows the first combined study of the K and LIII edges of this material to 33 GPa.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Carnegie Inst. of Science, Washington, DC (United States). Geophysical Lab.
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
- Grant/Contract Number:
- AC02-06CH11357; AC52-06NA25396; FG02-94ER14466; FG02-99ER45775; NA0001974; EAR1128799; EAR1157758; EAR 11-57758; EAR-1128799; NA0002006
- OSTI ID:
- 1242313
- Alternate ID(s):
- OSTI ID: 1242314; OSTI ID: 1247314; OSTI ID: 1379176
- Report Number(s):
- LA-UR-15-25295
- Journal Information:
- Journal of Physics. Condensed Matter, Journal Name: Journal of Physics. Condensed Matter Vol. 28 Journal Issue: 15; ISSN 0953-8984
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United Kingdom
- Language:
- English
Web of Science
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