Pressure-Induced Structural Transition Trends in Nanocrystalline Rare-Earth Sesquioxides: A Raman Investigation
IR@NPL: CSIR-National Physical Laboratory, New Delhi
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| Title |
Pressure-Induced Structural Transition Trends in Nanocrystalline Rare-Earth Sesquioxides: A Raman Investigation
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| Creator |
Sharma, Nita Dilawar
Singh, Jasveer Vijay, Aditi Samanta, K. Dogra, S. Bandyopadhyay, A. K. |
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| Subject |
Physical Chemistry
Materials Science Nanoscience/ Nanotechnology |
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| Description |
The article presents a concise review of our investigations on the preferred transition paths followed as well as high-pressure-induced structural changes in nanocrystalline rare-earth sesquioxides that include Y2O3, Sm2O3,Gd2O3, Eu2O3, Dy2O3, Ho2O3, and Yb2O3. The starting phase in all samples was predominantly cubic, as characterized using X-ray diffraction and Raman spectroscopy. The pressure-induced structural changes were primarily tracked via changes in phonon modes in the Raman spectra. The structural transition sequences demonstrated behaviors differing from the polycrystalline trends usually observed; however, it was interesting to note that the onset pressures and subsequent shifts in the phonon modes followed a trend similar to the unpressurized samples when observed with respect to the f-electron number. The mode Gruneisen parameters were estimated from the high-pressure data, which indicated a swifter response to external stimuli as the particle size reduced below an average of 50 nm. It was also inferred that the presence of traces of clisordered/nonstoichiometric material directly affected the structural transition sequence. A summary of the results and the mechanisms leading to such structural transitions is discussed.
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| Publisher |
American Chemical Society
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| Date |
2016-06-02
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://npl.csircentral.net/2337/1/Pressure-Induced%20Structural.pdf
Sharma, Nita Dilawar and Singh, Jasveer and Vijay, Aditi and Samanta, K. and Dogra, S. and Bandyopadhyay, A. K. (2016) Pressure-Induced Structural Transition Trends in Nanocrystalline Rare-Earth Sesquioxides: A Raman Investigation. Journal of Physical Chemistry C, 120 (21). 11679 -11689. ISSN 1932-7447 |
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| Relation |
http://npl.csircentral.net/2337/
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