Mishra, KK and Sahu, BK and Bonu, V and Das, A and Katiyar, RS and Ravindran, TR (2021) Raman Fingerprint of Pressure-Induced Phase Transition in SnO2Nanoparticles: Grüneisen Parameter and Thermal Expansion. Journal of Physical Chemistry C, 125 (42). pp. 23287-23298.
Full text not available from this repository.Abstract
Pressure-induced phase transition studies in nanomaterials are important to comprehend thermodynamics at the nanoscale. Raman spectroscopic studies at high pressure in a diamond anvil cell were performed up to 40 GPa on rutile tetragonal phase of SnO2 nanoparticles (NPs) of sizes ∼2, 4, and 25 nm to investigate their phase stability and phonon anharmonicity. In 25 nm NPs, evidence of phase transitions was observed at ∼11 and ∼24 GPa, 4 nm NPs indicated a cubic phase transition ∼21 GPa, and the 2.4 nm quasi-nanocrystals were found to stable up to 30 GPa. Raman spectra down to 90 K indicated that phonons of 2.4 nm NPs were more anharmonic. The analysis of total Raman intensity with increasing pressure suggested propagation of disorder from the surface to the central core of the NPs under pressure. Pressure-induced effects on 25, 4, and 2.4 nm NPs reduced their average diameters to 6.4 ± 2.6, 4.04 ± 1.36, and 3.85 ± 0.9 nm, respectively. Using Raman mode Grüneisen parameters γj, the thermal expansion coefficient α of the 25, 4, and 2.4 nm SnO2 NPs at 300 K was estimated as 1.674 × 10–6, 1.178 × 10–6, and 1.690 × 10–6 K–1, respectively.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Grüneisen Parameter, Thermal Expansion |
| Subjects: | RENEWABLE ENERGY > Thermal Energy CHEMISTRY AND MATERIALS > Chemistry and Materials (General) CHEMISTRY AND MATERIALS > Composite Materials |
| Depositing User: | Mrs. Usha Kumari |
| Date Deposited: | 06 Apr 2022 15:16 |
| Last Modified: | 06 Apr 2022 15:16 |
| URI: | http://nal-ir.nal.res.in/id/eprint/13520 |
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