Phase transition and water incorporation into Eu₂Sn₂O₇ pyrochlore at high pressure

Journal Article · Thu Mar 10 00:00:00 EST 2016 · Chemical Physics Letters

DOI:https://doi.org/10.1016/j.cplett.2016.03.016· OSTI ID:1289954

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

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1. Univ. of Michigan, Ann Arbor, MI (United States)
2. Univ. of Tennessee, Knoxville, TN (United States)
3. Stanford Univ., Stanford, CA (United States)

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.

• Research Organization: Univ. of Michigan, Ann Arbor, MI (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)
• Grant/Contract Number: NA0001977
• OSTI ID: 1289954
• Alternate ID(s): OSTI ID: 1336831
• Journal Information: Chemical Physics Letters, Vol. 650, Issue C; ISSN 0009-2614
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE