کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1272934 | 1497604 | 2010 | 12 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Effect of H-induced microstructural changes on pressure-optical transmission isotherms for Mg–V thin films Effect of H-induced microstructural changes on pressure-optical transmission isotherms for Mg–V thin films](/preview/png/1272934.png)
Although neither V nor Ti is supposed to mix with Mg, in thin films some alloy formation is observed. On hydrogenation, these alloys show clearly different behaviors. Films of Mg–V disproportionate during repeated absorption and desorption of hydrogen, in contrast to Mg–Ti thin films which are structurally reversible upon several hydrogenation cycles. Using Hydrogenography on co-sputtered Mg–V thin films, we observe the progressive segregation of Mg and V atoms induced by the formation of the respective hydrides. A simple multi-site lattice-gas model with long range H–H interaction reproduces well the optically measured isotherms and allows to determine the evolution of the chemical short-range order parameter s with cycling. The complex features observed in the isotherms are related to microstructural changes in the film. This paper shows how hydrogenography, being an optical technique, allows us to determine thermodynamic and structural/compositional information for a very large number of metal hydrides simultaneously.
Journal: International Journal of Hydrogen Energy - Volume 35, Issue 13, July 2010, Pages 6959–6970