Stability of fluorite-type La2Ce2O7 under extreme conditions

Zhang, F. X.; Tracy, C. L.; Lang, M.; Ewing, R. C.

doi:10.1016/j.jallcom.2016.03.002

Stability of fluorite-type La₂Ce₂O₇ under extreme conditions

Journal Article · Thu Mar 03 00:00:00 EST 2016 · Journal of Alloys and Compounds

DOI:https://doi.org/10.1016/j.jallcom.2016.03.002· OSTI ID:1338343

Zhang, F. X. ^[1]; Tracy, C. L. ^[2]; Lang, M. ^[3]; Ewing, R. C. ^[4]

The Univ. of Michigan, Ann Arbor, MI (United States); Yanshan Univ., Hebei (China); Carnegie Institution of Washington
The Univ. of Michigan, Ann Arbor, MI (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Stanford Univ., Stanford, CA (United States)

Here, the structural stability of fluorite-type La₂Ce₂O₇ was studied at pressure up to ~40 GPa and under hydrothermal conditions (~1 GPa, 350 °C), respectively, using synchrotron x-ray diffraction (XRD) and Raman scattering measurements. XRD measurements indicated that fluorite-type La₂Ce₂O₇ is not stable at pressures greater than 22.6 GPa and slowly transforms to a high-pressure phase. The high-pressure phase is not stable and changes back to the fluorite-type structure when pressure is released. The La₂Ce₂O₇ fluorite is also not stable under hydrothermal conditions and begins to react with water at 200~250 °C. Both Raman and XRD results suggest that lanthanum hydroxide La(OH)₃ and La³⁺-doped CeO₂ fluorite are the dominant products after hydrothermal treatment.

View Accepted Manuscript (DOE)

Research Organization:: Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US); Carnegie Institution of Washington, Washington, DC (United States); The University of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: USDOE; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC02-06CH11357; FG02-99ER45775; NA0001974; NA0001977; NA0002006

OSTI ID:: 1338343

Alternate ID(s):: OSTI ID: 1359232
OSTI ID: 22613593

Journal Information:: Journal of Alloys and Compounds, Journal Name: Journal of Alloys and Compounds Journal Issue: C Vol. 674; ISSN 0925-8388

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

36 MATERIALS SCIENCE
La2Ce2O7
extreme condition
phase transition