| Full text | |
| Author(s): |
de Souza, Mariano
;
Menegasso, Paulo
;
Paupitz, Ricardo
;
Seridonio, Antonio
;
Lagos, Roberto E.
Total Authors: 5
|
| Document type: | Journal article |
| Source: | European Journal of Physics; v. 37, n. 5 SEP 2016. |
| Web of Science Citations: | 2 |
| Abstract | |
The Gruneisen ratio (Gamma), i.e. the ratio of the thermal expansivity to the specific heat at constant pressure, quantifies the degree of anharmonicity of the potential governing the physical properties of a system. While G has been intensively explored in solid state physics, very little is known about its behavior for gases. This is most likely due to the difficulties posed in carrying out both thermal expansion and specific heat measurements in gases with high accuracy as a function of pressure and temperature. Furthermore, to the best of our knowledge a comprehensive discussion about the peculiarities of the Gruneisen ratio is still lacking in the literature. Here we report on a detailed and comprehensive overview of the Gruneisen ratio. Particular emphasis is placed on the analysis of Gamma for gases. The main findings of this work are: (i) for the van der Waals gas Gamma depends only on the co-volume b due to interaction effects, it is smaller than that for the ideal gas (Gamma = 2/3) and diverges upon approaching the critical volume; (ii) for the Bose-Einstein condensation of an ideal boson gas, assuming the transition as first-order, Gamma diverges upon approaching a critical volume, similarly to the van der Waals gas; (iii) for He-4 at the superfluid transition Gamma shows a singular behavior. Our results reveal that Gamma can be used as an appropriate experimental tool to explore pressure-induced critical points. (AU) | |
| FAPESP's process: | 11/22050-4 - Exploring thermodynamic and transport properties of strongly correlated electron systems |
| Grantee: | Valdeci Pereira Mariano de Souza |
| Support Opportunities: | Regular Research Grants |