Chemistry:Pentamagnesium digallide
From HandWiki
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| Names | |
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| IUPAC name
Pentamagnesium digallide
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Other names
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| Identifiers | |
3D model (JSmol)
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PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |
| Mg5Ga2 | |
| Molar mass | 260.97 g/mol |
| Appearance | White crystalline solid |
| Density | 3.08 g/cm3 |
| Melting point | 456 °C (853 °F; 729 K) |
| Structure | |
| Orthorhombic | |
| Ibam | |
| mmm | |
a = 13.71 Å, b = 7.02 Å, c = 6.02 Å
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Lattice volume (V)
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579.06 Å3 |
| Thermochemistry | |
Std enthalpy of
formation (ΔfH⦵298) |
-206.5 kJ/mol (calculated) |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Pentamagnesium digallide, also known as magnesium gallide(−V), is a chemical compound in the family of magnesium gallides (MgxGay). This compound has gallium in the rare oxidation state −5 and is produced by splat quenching of a molten mixture of magnesium and gallium metal then heating the resulting substance to 350 °C:[1][2]
- 5Mg + 2Ga → Mg5Ga2
It is an unwanted product when magnesium-gallium alloys are exposed to high temperatures.[3]
References
- ↑ Bruno Predel; Knut Hülse (1979). "Metastabile kristalline und glasartige phasen im system Magnesium-Gallium" (in en). Journal of the Less Common Metals 63 (1): 45–56. doi:10.1016/0022-5088(79)90207-8.
- ↑ Patrick Hofmann. "Colture. Ein Programm zur interaktiven Visualisierung von Festkörperstrukturen sowie Synthese, Struktur und Eigenschaften von binären und ternären Alkali- und Erdalkalimetallgalliden" (in de). p. 72. http://www.uni-kassel.de/upress/online/frei/978-3-7281-2597-2.volltext.frei.pdf.
- ↑ Yan Feng; Ri-chu Wang; Chao-qun Peng; Hui-ping Tang; Hai-yan Liu (2011). "Influence of Mg5Ga2 compound on microstructures and electrochemical properties of Mg-5%Hg-22%Ga alloy" (in en). Progress in Natural Science: Materials International 21 (1): 73–79. doi:10.1016/S1002-0071(12)60028-8.
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