1. Statistical physics modeling of hydrogen desorption from LaNi4.75Fe0.25: Stereographic and energetic interpretations.
- Author
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Wjihi, Sarra, Dhaou, Houcine, Yahia, Manel Ben, Knani, Salah, Jemni, Abdelmajid, and Lamine, Abdelmottaleb Ben
- Subjects
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HYDROGEN analysis , *STATISTICAL physics , *DESORPTION , *STEREOGRAPHS , *CHEMISTRY experiments - Abstract
Statistical physics treatment is used to study the desorption of hydrogen on LaNi 4.75 Fe 0.25 , in order to obtain new physicochemical interpretations at the molecular level. Experimental desorption isotherms of hydrogen on LaNi 4.75 Fe 0.25 are fitted at three temperatures (293 K, 303 K and 313 K), using a monolayer desorption model. Six parameters of the model are fitted, namely the number of molecules per site n α and n β , the receptor site densities N αM and N βM , and the energetic parameters P α and P β . The behaviors of these parameters are discussed in relationship with desorption process. A dynamic study of the α and β phases in the desorption process was then carried out. Finally, the different thermodynamical potential functions are derived by statistical physics calculations from our adopted model. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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