Magnesium nickel hydride

Magnesium nickel hydride
Names
	IUPAC name Magnesium nickel hydride
	Other names Nickel magnesium hydride
Identifiers
CAS Number	Mg2NiD4:: 77340-45-5;
3D model (JSmol)	Interactive image;
	InChI InChI=1S/2Mg.Ni.4H/q2+2;;4-1 Key: XJFICWYDVPSDKB-UHFFFAOYSA-N;
	SMILES [H-].[H-].[H-].[H-].[Mg+2].[Mg+2].[Ni];
Properties
Chemical formula	Mg2[NiH4]
Molar mass	111.335 g·mol−1
Appearance	Reddish-brown crystalline solid
Density	2.71 g/cm3
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Magnesium nickel hydride is the chemical compound with formula Mg₂[Ni H₄]. It is a reddish-brown crystalline solid. It contains 3.6% by weight of hydrogen and has been studied as a potential hydrogen storage medium.^[2]^[3]

Synthesis

The compound can be obtained by heating magnesium and nickel metal powders in hydrogen.^[1]

2 Mg + Ni + 2 H₂ → Mg₂[NiH₄]

The intermetallic compound Mg₂Ni reacts with hydrogen at 350 °C (662 °F) to yield Mg₂[NiH₄].^[4]

Structure

It consists of Mg²⁺ cations and [NiH₄]⁴⁻ anions. It is in a form of a monoclinic crystals that transform into the cubic crystals at 220 °C (428 °F).^[5]

References

^ ^a ^b Selvam, P; Yvon, K (1991). "Synthesis of Mg
₂FeH
₆, Mg
₂CoH
₅ and Mg
₂NiH
₄ by high-pressure sintering of the elements". International Journal of Hydrogen Energy. 16 (9): 615–617. doi:10.1016/0360-3199(91)90085-W.
^ Zolliker, Peter; Yvon, K.; Jorgensen, J. D.; Rotella, F. J. (September 1986). "Structural studies of the hydrogen storage material magnesium nickel hydride (Mg
₂NiH
₄). 2. Monoclinic low-temperature structure". Inorganic Chemistry. 25 (20): 3590–3593. doi:10.1021/ic00240a012.
^ Li, Liquan; Akiyama, Tomohiro; Yagi, Jun-ichiro (August 2000). "Hydrogen storage alloy of Mg
₂NiH
₄ hydride produced by hydriding combustion synthesis from powder of mixture metal". Journal of Alloys and Compounds. 308 (1–2): 98–103. doi:10.1016/S0925-8388(00)00906-3.
^ https://pubs.acs.org/doi/abs/10.1021/ic50069a016
^ https://pubs.acs.org/doi/abs/10.1021/ic50223a006

[sciencedirect-1] Selvam, P; Yvon, K (1991). "Synthesis of Mg
₂FeH
₆, Mg
₂CoH
₅ and Mg
₂NiH
₄ by high-pressure sintering of the elements". International Journal of Hydrogen Energy. 16 (9): 615–617. doi:10.1016/0360-3199(91)90085-W.

[2] Zolliker, Peter; Yvon, K.; Jorgensen, J. D.; Rotella, F. J. (September 1986). "Structural studies of the hydrogen storage material magnesium nickel hydride (Mg
₂NiH
₄). 2. Monoclinic low-temperature structure". Inorganic Chemistry. 25 (20): 3590–3593. doi:10.1021/ic00240a012.

[3] Li, Liquan; Akiyama, Tomohiro; Yagi, Jun-ichiro (August 2000). "Hydrogen storage alloy of Mg
₂NiH
₄ hydride produced by hydriding combustion synthesis from powder of mixture metal". Journal of Alloys and Compounds. 308 (1–2): 98–103. doi:10.1016/S0925-8388(00)00906-3.

[pubs-4] ttps://pubs.acs.org/doi/abs/10.1021/ic50069a016

[pubs1-5] ttps://pubs.acs.org/doi/abs/10.1021/ic50223a006

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