A comprehensive investigation of structural, morphological, hydrogen absorption and magnetic properties of MmNi4.22Co0.48Mn0.15Al0.15 alloy
作者： Seyyed Mojtaba Zareii , Hadi Arabi , Faiz Pourarian
DOI: 10.1142/S0217979214501252
关键词:
摘要: A comprehensive study of structural, morphological, hydrogen absorption and magnetic properties MmNi4.22 Co0.48Mn0.15Al0.15 alloy as a promising storage media was investigated. The X-ray diffraction (XRD) profiles show that the maintains its crystal structure (hexagonal LaNi5-type) even after 30 hydrogenation/dehydrogenation (H/D) cycles. However, XRD peaks are found to be slightly broadened cycling. SEM images reveal particles size cycled sample decreases, with more uniform particle distribution compared noncycled ones. pressure-composition (PC) isotherms kinetics curves reaction were obtained at different working temperatures by using homemade Sievert apparatus. enthalpy entropy hydride formation evaluated. Furthermore, Jander diffusion Johnson–Mehl–Avrami models fitting employed kinetic mechanism hydriding activation energy. room temperature measurements indicate milling H/D cycling change as-annealed alloy.
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