Dogra, Sugandha ; Sharma, Nita Dilawar ; Singh, Jasveer ; Poswal, Himanshu Kumar ; Sharma, S. M. ; Bandyopadhyay, A. K. (2011) High pressure behavior of nano-crystalline CeO2 up to 35 GPa: a Raman investigation High Pressure Research, 31 (2). pp. 292-303. ISSN 0895-7959
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Official URL: http://www.tandfonline.com/doi/abs/10.1080/0895795...
Related URL: http://dx.doi.org/10.1080/08957959.2011.576674
Abstract
The present paper reports the results of in situ Raman studies carried out on nano-crystalline CeO2 up to a pressure of 35 GPa at room temperature. The material was characterized at ambient conditions using X-ray diffraction and Raman spectroscopy and was found to have a cubic structure. We observed the Raman peak at ambient at 465 cm-1, which is characteristic of the cubic structure of the material. The sample was pressurized using a diamond anvil cell using ruby fluorescence as the pressure monitor, and the phase evolution was tracked by Raman spectroscopy. With an increase in the applied pressure, the cubic band was seen to steadily shift to higher wavenumbers. However, we observed the appearance of a number of new peaks around a pressure of about 34.7 GPa. CeO2 was found to undergo a phase transition to an orthorhombic α -PbCl2-type structure at this pressure. With the release of the applied pressure, the observed peaks steadily shift to lower wavenumbers. On decompression, the high pressure phase existed down to a total release of pressure.
Item Type: | Article |
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Source: | Copyright of this article belongs to Taylor and Francis Group. |
Keywords: | High Pressure; Phase Transitions; Raman Spectroscopy; CeO2 |
ID Code: | 81873 |
Deposited On: | 09 Feb 2012 04:50 |
Last Modified: | 09 Feb 2012 04:50 |
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