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Synthesis and hydriding behavior of Li2MgPt

Authors
Journal
Journal of Alloys and Compounds
0925-8388
Publisher
Elsevier
Publication Date
Volume
509
Issue
6
Identifiers
DOI: 10.1016/j.jallcom.2010.11.180
Keywords
  • Hydrogen Absorbing Materials
  • Metal Hydrides
  • Electronic Band Structure
  • Enthalpy

Abstract

Research highlights ▶ The new phase Li 2MgPt can be formed by mechanical milling of the constituent elements. ▶ Li 2MgPt crystallizes in the cubic P 4 ¯ 3 m space group and is isostructural to the known phases Li 2MgSi and Li 2MgIr. ▶ Hydriding of Li 2MgPt proceeds according to the reaction Li 2MgPt + H 2 → MgPt + 2LiH. Tetragonal MgPt is a new member of the Mg–Pt binary phase diagram previously misidentified by others as an Mg–Pt–C–H quaternary. ▶ Li 2MgPt can also be formed by heat treating a mixture of LiH and MgPt in a 2:1 ratio. The reaction occurs below the decomposition temperature of LiH, so that MgPt can be considered to destabilize LiH. ▶ Even ignoring the cost of Pt, this system is unsuitable for cyclable hydrogen due to the accumulation of undesirable secondary phases with repeated exposure.

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