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Title: Structural Distortions and Phase Transformations in Sm2Zr2O7 Pyrochlore at High Pressures

Abstract

The structural characteristics of Sm{sub 2}Zr{sub 2}O{sub 7}, an ordered pyrochlore, were studied by angle-dispersive X-ray diffraction (XRD) and Raman scattering methods with increasing pressure. A structural distortion was observed at low pressures; but the distortion disappeared at pressures above 13.5 GPa. Above 18 GPa, the pyrochlore structure is unstable and a pressure-induced phase transition occurred. The high-pressure phase is a distorted fluorite structure in which the cations and anion vacancies are disordered. The disordered structure is accompanied by the formation of partially amorphous domains. With the release of pressure, the high-pressure phase partially transforms to the amorphous state.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
930467
Report Number(s):
BNL-81219-2008-JA
Journal ID: ISSN 0009-2614; CHPLBC; TRN: US200904%%735
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Chemical Physics Letters; Journal Volume: 441; Journal Issue: 39544
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AMORPHOUS STATE; ANIONS; CATIONS; CRYSTAL STRUCTURE; FLUORITE; PHASE TRANSFORMATIONS; PRESSURE RANGE GIGA PA; PYROCHLORE; SCATTERING; VACANCIES; X-RAY DIFFRACTION; national synchrotron light source

Citation Formats

Zhang,F., Lian, J., Becker, U., Wang, L., Hu, J., Saxena, S., and Ewing, R. Structural Distortions and Phase Transformations in Sm2Zr2O7 Pyrochlore at High Pressures. United States: N. p., 2007. Web. doi:10.1016/j.cplett.2007.05.018.
Zhang,F., Lian, J., Becker, U., Wang, L., Hu, J., Saxena, S., & Ewing, R. Structural Distortions and Phase Transformations in Sm2Zr2O7 Pyrochlore at High Pressures. United States. doi:10.1016/j.cplett.2007.05.018.
Zhang,F., Lian, J., Becker, U., Wang, L., Hu, J., Saxena, S., and Ewing, R. Mon . "Structural Distortions and Phase Transformations in Sm2Zr2O7 Pyrochlore at High Pressures". United States. doi:10.1016/j.cplett.2007.05.018.
@article{osti_930467,
title = {Structural Distortions and Phase Transformations in Sm2Zr2O7 Pyrochlore at High Pressures},
author = {Zhang,F. and Lian, J. and Becker, U. and Wang, L. and Hu, J. and Saxena, S. and Ewing, R.},
abstractNote = {The structural characteristics of Sm{sub 2}Zr{sub 2}O{sub 7}, an ordered pyrochlore, were studied by angle-dispersive X-ray diffraction (XRD) and Raman scattering methods with increasing pressure. A structural distortion was observed at low pressures; but the distortion disappeared at pressures above 13.5 GPa. Above 18 GPa, the pyrochlore structure is unstable and a pressure-induced phase transition occurred. The high-pressure phase is a distorted fluorite structure in which the cations and anion vacancies are disordered. The disordered structure is accompanied by the formation of partially amorphous domains. With the release of pressure, the high-pressure phase partially transforms to the amorphous state.},
doi = {10.1016/j.cplett.2007.05.018},
journal = {Chemical Physics Letters},
number = 39544,
volume = 441,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}