Abstract
A new hydride phase apart from Mg 2NiH 4 has been identified in the Mg 2NiH 2 system by pressure-composition-temperature relationships, thermal analyses and X-ray diffraction measurements. The new phase has an approximate composition Mg 2NiH and is considered to be the intermediate phase in the Mg 2NiH 2 reaction. The additional hydride phase, Mg 2NiH (named as β-hydride) and the full hydride phase, Mg 2NiH 4 (named as γ-hydride) have been shown to crystallize in monoclinic structure. The β-phase (Mg 2NiH) also exhibits a phase transition from monoclinic to cubic structure similar to the γ-phase (Mg 2NiH 4).
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