Pandey, Sugandha Dogra and Samanta, K. and Singh, Jasveer and Sharma, Nita Dilawar and Bandyopadhyay, A. K. (2013) Anharmonic behavior and structural phase transition in Yb2O3. AIP Advances , 3 (12). pp. 122123-1. ISSN 2158-3226
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Abstract
The investigation of structural phase transition and anharmonic behavior of Yb2O3 has been carried out by high-pressure and temperature dependent Raman scattering studies respectively. In situ Raman studies under high pressure were carried out in a diamond anvil cell at room temperature which indicate a structural transition from cubic to hexagonal phase at and above 20.6 GPa. In the decompression cycle, Yb2O3 retained its high pressure phase. We have observed a Stark line in the Raman spectra at 337.5 cm(-1) which arises from the electronic transition between F-2(5/2) and F-2(7/2) multiplates of Yb3+ (4f(13)) levels. These were followed by temperature dependent Raman studies in the range of 80-440 K, which show an unusual mode hardening with increasing temperature. The hardening of the most dominant mode (T-g + A(g)) was analyzed in light of the theory of anharmonic phonon-phonon interaction and thermal expansion of the lattice. Using the mode Gruneisen parameter obtained from high pressure Raman measurements; we have calculated total anharmonicity of the T-g + A(g) mode from the temperature dependent Raman data.
| Item Type: | Article |
|---|---|
| Subjects: | Materials Science Nanoscience/ Nanotechnology |
| Divisions: | UNSPECIFIED |
| Depositing User: | Users 27 not found. |
| Date Deposited: | 28 May 2020 10:42 |
| Last Modified: | 28 May 2020 10:42 |
| URI: | http://npl.csircentral.net/id/eprint/2974 |
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