High Pressure Synthesis of Novel Mg(Ni1-xCux)2 Hydrides (x=0-0.2)
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In our previous papers, we have reported the hydrogenation of MgNi<SUB>2</SUB> with C36-type structure under GPa-order hydrogen pressure. In this paper, the effect of Cu substitution in MgNi<SUB>2</SUB> was studied on the crystal structures, thermal stabilities and hydrogen contents of Mg(Ni<SUB>1−<I>x</I></SUB>Cu<I><SUB>x</SUB></I>)<SUB>2</SUB> hydrides (<I>x</I>=0–0.2). The hydrides were obtained by high pressure synthesis using cubic-anvil-type apparatus at 973 K for 8 h under 5 GPa. The hydrides were found to have primitive orthorhombic (<I>Pmmm</I>, <I>x</I>=0.0–0.1) and body-centered tetragonal structures (<I>I</I>4⁄<I>mmm</I>, <I>x</I>=0.15–0.2). Their hydrogen contents were estimated to be 2.23–2.32 mass%. Dehydrogenation temperature decreased from 460 K (<I>x</I>=0.0) to 429 K (<I>x</I>=0.20) with increasing amount of Cu substitution. After dehydrogenation, the C36-type phase was observed by X-ray diffraction (XRD). Consequently, it is noteworthy that Mg(Ni<SUB>1−<I>x</I></SUB>Cu<I><SUB>x</SUB></I>)<SUB>2</SUB> could be hydrogenated reversibly without disproportionation under high pressure of the order of gigapascals.
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