Chemistry:Magnesium nickel hydride
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| Names | |
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| IUPAC name
Magnesium nickel hydride
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| Other names
Nickel magnesium hydride
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| Identifiers | |
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3D model (JSmol)
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| Properties | |
| Mg 2[NiH 4] | |
| Molar mass | 111.335 g·mol−1 |
| Appearance | Reddish-brown crystalline solid[1] |
| 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 | |
Tracking categories (test):
Magnesium nickel hydride is the chemical compound with formula Mg
2[[[Chemistry:Nickel|Ni]]H
4]. 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 H
2 → Mg
2[NiH
4]
The intermetallic compound Mg
2Ni reacts with hydrogen at 350 °C (662 °F) to yield Mg
2[NiH
4].[4]
Structure
It consists of Mg2+ cations and [NiH
4]4− anions. It is in a form of a monoclinic crystals that transform into the cubic crystals at 220 °C (428 °F).[5]
References
- ↑ 1.0 1.1 Selvam, P; Yvon, K (1991). "Synthesis of Mg2FeH6, Mg2CoH5 and Mg2NiH4 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 (Mg2NiH4). 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 Mg2NiH4 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
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