ChemInform Abstract: Influence of the Microstructure on the Desorption Kinetics of Single- and Multiphase LaNiFe Alloys.

✍ Scribed by N. MOMMER; M. HIRSCHER; F. CUEVAS; H. KRONMUELLER

• Publisher: John Wiley and Sons
• Year: 2010
• Weight: 38 KB
• Volume: 29
• Category: Article
• ISSN: 0931-7597
• DOI: 10.1002/chin.199822023

✦ Synopsis

Influence of the Microstructure on the Desorption Kinetics of Singleand Multiphase LaNiFe Alloys.

-The desorption kinetics of D 2 is studied on La(Ni 0.7 Fe 0.3 ) 5 and La(Ni 0.7 Fe 0.3 ) 5 -Ni 0.7 Fe 0.3 alloys. At low hydrogen concentrations [D]/[AB 5 ] ≤ 0.5, the desorption kinetics of activated microcrystalline alloys are dominated by the influence of dislocations, which act as trapping sites for hydrogen atoms. In the presence of both the α and hydride phase, the phase transformation of the latter or diffusion in the β phase is the rate controlling process with an activation enthalpy of 0.39 eV for deuterated samples. The measured activation enthalpy for D 2 diffusion in the α phase is Q = 0.