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Pressure-induced phase transitions in nanocrystalline ReO3

Biswas, Kanishka and Muthu, D. V. S. and Sood, A. K. and Kruger, M. B. and Chen, B and Rao, C. N. R. (2007) Pressure-induced phase transitions in nanocrystalline ReO3. Journal of Physics Condensed Matter, 19 . p. 436214.

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Abstract

Pressure-induced phase transitions in the nanocrystals of ReO3 with an average diameter of ~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 ) transforms to a monoclinic phase (space group C 2/c), then to a rhombohedral I phase (space group ), and finally to another rhombohedral phase (rhombohedral II, space group ) with increasing pressure over the 0.0–20.3 GPa range. The cubic I to monoclinic transition is associated with the largest volume change (~5%), indicative of a reconstructive transition. The transition pressures are generally lower than those known for bulk ReO3. The cubic II () 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.

Item Type:Article
Subjects:Material Science > Nanochemistry
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:3443
Deposited By:JNCASR
Deposited On:20 Jan 2009 10:06
Last Modified:12 Feb 2009 13:27

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