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Title: Phase transition and water incorporation into Eu2Sn2O7 pyrochlore at high pressure

Abstract

Structural changes of europium stannate pyrochlore, Eu2Sn2O7, have been investigated at high pressures with in situ Raman spectroscopy, photoluminescence (PL), and synchrotron X-ray diffraction (XRD) techniques. The XRD measurements suggest that a pressure-induced phase transition starts at 34.4 GPa. The PL spectrum from Eu3+ cations also suggests a phase transition above 36 GPa. XRD analysis shows that the unit cell of the cubic phase deviates from the equation of state at pressures above 23.8 GPa. Lastly, this is due to the incorporation of water from the pressure medium in the structure at high pressures, which is confirmed by optical spectroscopy measurements.

Authors:
 [1];  [2];  [3]
  1. Univ. of Michigan, Ann Arbor, MI (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)
  3. Stanford Univ., Stanford, CA (United States)
Publication Date:
Research Org.:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP) (NA-10)
OSTI Identifier:
1289954
Alternate Identifier(s):
OSTI ID: 1336831
Grant/Contract Number:  
NA0001977
Resource Type:
Accepted Manuscript
Journal Name:
Chemical Physics Letters
Additional Journal Information:
Journal Volume: 650; Journal Issue: C; Journal ID: ISSN 0009-2614
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Zhang, F. X., Lang, M., and Ewing, R. C. Phase transition and water incorporation into Eu2Sn2O7 pyrochlore at high pressure. United States: N. p., 2016. Web. doi:10.1016/j.cplett.2016.03.016.
Zhang, F. X., Lang, M., & Ewing, R. C. Phase transition and water incorporation into Eu2Sn2O7 pyrochlore at high pressure. United States. doi:10.1016/j.cplett.2016.03.016.
Zhang, F. X., Lang, M., and Ewing, R. C. Thu . "Phase transition and water incorporation into Eu2Sn2O7 pyrochlore at high pressure". United States. doi:10.1016/j.cplett.2016.03.016. https://www.osti.gov/servlets/purl/1289954.
@article{osti_1289954,
title = {Phase transition and water incorporation into Eu2Sn2O7 pyrochlore at high pressure},
author = {Zhang, F. X. and Lang, M. and Ewing, R. C.},
abstractNote = {Structural changes of europium stannate pyrochlore, Eu2Sn2O7, have been investigated at high pressures with in situ Raman spectroscopy, photoluminescence (PL), and synchrotron X-ray diffraction (XRD) techniques. The XRD measurements suggest that a pressure-induced phase transition starts at 34.4 GPa. The PL spectrum from Eu3+ cations also suggests a phase transition above 36 GPa. XRD analysis shows that the unit cell of the cubic phase deviates from the equation of state at pressures above 23.8 GPa. Lastly, this is due to the incorporation of water from the pressure medium in the structure at high pressures, which is confirmed by optical spectroscopy measurements.},
doi = {10.1016/j.cplett.2016.03.016},
journal = {Chemical Physics Letters},
number = C,
volume = 650,
place = {United States},
year = {2016},
month = {3}
}

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