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Title: Stability of fluorite-type La 2Ce 2O 7 under extreme conditions

Abstract

Here, the structural stability of fluorite-type La 2Ce 2O 7 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 La 2Ce 2O 7 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 La 2Ce 2O 7 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 La 3+-doped CeO 2 fluorite are the dominant products after hydrothermal treatment.

Authors:
 [1];  [2];  [3];  [4]
  1. The Univ. of Michigan, Ann Arbor, MI (United States); Yanshan Univ., Hebei (China)
  2. The Univ. of Michigan, Ann Arbor, MI (United States)
  3. Univ. of Tennessee, Knoxville, TN (United States)
  4. Stanford Univ., Stanford, CA (United States)
Publication Date:
Research Org.:
Univ. of Michigan, Ann Arbor, MI (United States); Carnegie Institution of Washington, Washington, DC (United States); Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1338343
Alternate Identifier(s):
OSTI ID: 1359232
Grant/Contract Number:  
NA0002006; NA0001977; NA0001974; FG02-99ER45775; AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Alloys and Compounds
Additional Journal Information:
Journal Volume: 674; Journal Issue: C; Journal ID: ISSN 0925-8388
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; La2Ce2O7; phase transition; extreme condition

Citation Formats

Zhang, F. X., Tracy, C. L., Lang, M., and Ewing, R. C. Stability of fluorite-type La2Ce2O7 under extreme conditions. United States: N. p., 2016. Web. doi:10.1016/j.jallcom.2016.03.002.
Zhang, F. X., Tracy, C. L., Lang, M., & Ewing, R. C. Stability of fluorite-type La2Ce2O7 under extreme conditions. United States. doi:10.1016/j.jallcom.2016.03.002.
Zhang, F. X., Tracy, C. L., Lang, M., and Ewing, R. C. Thu . "Stability of fluorite-type La2Ce2O7 under extreme conditions". United States. doi:10.1016/j.jallcom.2016.03.002. https://www.osti.gov/servlets/purl/1338343.
@article{osti_1338343,
title = {Stability of fluorite-type La2Ce2O7 under extreme conditions},
author = {Zhang, F. X. and Tracy, C. L. and Lang, M. and Ewing, R. C.},
abstractNote = {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.},
doi = {10.1016/j.jallcom.2016.03.002},
journal = {Journal of Alloys and Compounds},
issn = {0925-8388},
number = C,
volume = 674,
place = {United States},
year = {2016},
month = {3}
}

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Cited by: 3 works
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