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Title: Pressure-Induced Phase Transitions in Nanocrystalline ReO3

Abstract

Pressure-induced phase transitions in the nanocrystals of ReO3 with an average diameter of {approx}12 nm have been investigated in detail by using synchrotron x-ray diffraction and the results compared with the literature data of bulk samples of ReO3. The study shows that the ambient-pressure cubic I phase (space group Pm{bar 3}m ) transforms to a monoclinic phase (space group C 2/c), then to a rhombohedral I phase (space group R{bar 3}c ), and finally to another rhombohedral phase (rhombohedral II, space group R{bar 3}c ) with increasing pressure over the 0.0-20.3 GPa range. The cubic I to monoclinic transition is associated with the largest volume change ({approx}5%), indicative of a reconstructive transition. The transition pressures are generally lower than those known for bulk ReO3. The cubic II (Im{bar 3} ) or tetragonal (P4/mbm) phases do not occur at lower pressures. The nanocrystals are found to be more compressible than bulk ReO3. On decompression to ambient pressure, the structure does not revert back to the cubic I structure.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
959712
Report Number(s):
BNL-82698-2009-JA
Journal ID: ISSN 0953-8984; JCOMEL; TRN: US1005789
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Physics: Condensed Matter; Journal Volume: 19
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; SPACE GROUPS; SYNCHROTRONS; X-RAY DIFFRACTION; PHASE TRANSFORMATIONS; PRESSURE DEPENDENCE; national synchrotron light source

Citation Formats

Biswas,K., Muthu, D., Sood, A., Kruger, M., Chen, B., and Rao, C. Pressure-Induced Phase Transitions in Nanocrystalline ReO3. United States: N. p., 2007. Web. doi:10.1088/0953-8984/19/43/436214.
Biswas,K., Muthu, D., Sood, A., Kruger, M., Chen, B., & Rao, C. Pressure-Induced Phase Transitions in Nanocrystalline ReO3. United States. doi:10.1088/0953-8984/19/43/436214.
Biswas,K., Muthu, D., Sood, A., Kruger, M., Chen, B., and Rao, C. Mon . "Pressure-Induced Phase Transitions in Nanocrystalline ReO3". United States. doi:10.1088/0953-8984/19/43/436214.
@article{osti_959712,
title = {Pressure-Induced Phase Transitions in Nanocrystalline ReO3},
author = {Biswas,K. and Muthu, D. and Sood, A. and Kruger, M. and Chen, B. and Rao, C.},
abstractNote = {Pressure-induced phase transitions in the nanocrystals of ReO3 with an average diameter of {approx}12 nm have been investigated in detail by using synchrotron x-ray diffraction and the results compared with the literature data of bulk samples of ReO3. The study shows that the ambient-pressure cubic I phase (space group Pm{bar 3}m ) transforms to a monoclinic phase (space group C 2/c), then to a rhombohedral I phase (space group R{bar 3}c ), and finally to another rhombohedral phase (rhombohedral II, space group R{bar 3}c ) with increasing pressure over the 0.0-20.3 GPa range. The cubic I to monoclinic transition is associated with the largest volume change ({approx}5%), indicative of a reconstructive transition. The transition pressures are generally lower than those known for bulk ReO3. The cubic II (Im{bar 3} ) or tetragonal (P4/mbm) phases do not occur at lower pressures. The nanocrystals are found to be more compressible than bulk ReO3. On decompression to ambient pressure, the structure does not revert back to the cubic I structure.},
doi = {10.1088/0953-8984/19/43/436214},
journal = {Journal of Physics: Condensed Matter},
number = ,
volume = 19,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}