MgCu₂

MgCu2
別名	Cu2Mg
識別
CAS號	12054-17-0
PubChem	71355210
ChemSpider	57534863
SMILES	[Mg].[Cu].[Cu];
性質
化學式	Cu2Mg
摩爾質量	151.4 g·mol−1
密度	5.76 g·cm−3
熔點	520 °C
	若非註明，所有數據均出自標準狀態（25 ℃，100 kPa）下。

MgCu₂是由鎂和銅構成的二元金屬間化合物，屬立方晶系，其空間群為Fd3m，晶胞參數a = 7.04 Å。^[3]MgCu₂也是一類化合物的結構類型，具有這一結構的有LaNi₂、CeFe₂、CeOs₂、EuIr₂、EuPt₂、TmRh₂等。^[4]

製備

MgCu₂可由Mg₂Cu的氫化反應，或銅和氫化鎂在高溫和壓強下反應得到：^[5]

2 Mg₂Cu + 3 H₂ → 3 MgH₂ + MgCu₂

MgH₂ + 2 Cu → MgCu₂ + H₂↑

MgCu₂也可以由化學計量比的單質在過量銅的存在下於380 °C反應製得。^[6]

性質

MgCu₂可以和硼或其氧化物反應，生成鎂的硼化物。^[7]

Cu₂Mg + 2 B → 2 Cu + MgB₂

Cu₂Mg + 6 B → 2 Cu + MgB₆

14 Cu₂Mg + 4 B₂O₃ → 28 Cu + MgB₂ + MgB₆ + 12 MgO

它也能和氫化鎂反應，生成正交晶系的Mg₂Cu並放出氫氣。^[8]

參考文獻

^ Cheng, C.H. The elastic constants of MgAg and MgCu₂ single crystals. Journal of Physics and Chemistry of Solids. 1967, 28 (3): 413–416. ISSN 0022-3697. doi:10.1016/0022-3697(67)90307-1.
^ Chen, W.; Sun, J. The electronic structure and mechanical properties of MgCu₂ Laves phase compound. Physica B: Condensed Matter. 2006, 382 (1-2): 279–284. ISSN 0921-4526. doi:10.1016/j.physb.2006.02.031.
^ Ganeshan, S.; Shang, S.L.; Zhang, H.; Wang, Y.; Mantina, M.; Liu, Z.K. Elastic constants of binary Mg compounds from first-principles calculations. Intermetallics. 2009, 17 (5): 313–318. ISSN 0966-9795. doi:10.1016/j.intermet.2008.11.005.
^ Morozkin, A.V.; Seropegin, Yu.D.; Gribanov, A.V.; Barakatova, J.M. Analysis of the melting temperatures of RT₂ compounds (MgCu₂ structure) (R=Rare Earth, T=Mn, Fe, Co, Ni, Ru, Rh, Pd, Os, Ir, Pt) and RT₂X₂ compounds (R=La, Ce, Sm, Er; T=Mn, Fe, Co, Ni, Cu, Ru, Rh, Pd, Pt; X=Si, Ge). Journal of Alloys and Compounds. 1997, 256 (1-2): 175–191. ISSN 0925-8388. doi:10.1016/S0925-8388(96)03017-4.
^ Shibata, Kazuya; Tanaka, Koji; Kurumatani, Kosuke; Nishida, Yasuki; Takeshita, Hiroyuki T. Thermodynamic Evaluation for Formation of MgCu₂ from MgH₂ and Cu: 221–226. 2013. doi:10.1002/9781118792148.ch28.
^ Arcot, Binny; Cabral, C.; Harper, J. M. E.; Murarka, S. P. Intermetallic Reactions Between Copper and Magnesium as an Adhesion / Barrier Layer. MRS Proceedings. 2011, 225. ISSN 0272-9172. doi:10.1557/PROC-225-231.
^ Birol, Yucel. Response to Thermal Exposure of Ball-Milled Cu-Mg/B₂O₃ Powder Blends. Metallurgical and Materials Transactions B. 2013, 44 (4): 969–973. ISSN 1073-5615. doi:10.1007/s11663-013-9860-6.
^ Volkova, L. S.; Kalinnikov, G. V.; Ivanov, A. V.; Shilkin, S. P. Synthesis of Mg₂Cu and MgCu₂ nanoparticles in a KCl-NaCl-MgCl₂ melt. Inorganic Materials. 2012, 48 (11): 1078–1081. ISSN 0020-1685. doi:10.1134/S0020168512110179.

參見

拉弗斯相

[1] Cheng, C.H. The elastic constants of MgAg and MgCu₂ single crystals. Journal of Physics and Chemistry of Solids. 1967, 28 (3): 413–416. ISSN 0022-3697. doi:10.1016/0022-3697(67)90307-1.

[2] Chen, W.; Sun, J. The electronic structure and mechanical properties of MgCu₂ Laves phase compound. Physica B: Condensed Matter. 2006, 382 (1-2): 279–284. ISSN 0921-4526. doi:10.1016/j.physb.2006.02.031.

[3] Ganeshan, S.; Shang, S.L.; Zhang, H.; Wang, Y.; Mantina, M.; Liu, Z.K. Elastic constants of binary Mg compounds from first-principles calculations. Intermetallics. 2009, 17 (5): 313–318. ISSN 0966-9795. doi:10.1016/j.intermet.2008.11.005.

[4] Morozkin, A.V.; Seropegin, Yu.D.; Gribanov, A.V.; Barakatova, J.M. Analysis of the melting temperatures of RT₂ compounds (MgCu₂ structure) (R=Rare Earth, T=Mn, Fe, Co, Ni, Ru, Rh, Pd, Os, Ir, Pt) and RT₂X₂ compounds (R=La, Ce, Sm, Er; T=Mn, Fe, Co, Ni, Cu, Ru, Rh, Pd, Pt; X=Si, Ge). Journal of Alloys and Compounds. 1997, 256 (1-2): 175–191. ISSN 0925-8388. doi:10.1016/S0925-8388(96)03017-4.

[5] Shibata, Kazuya; Tanaka, Koji; Kurumatani, Kosuke; Nishida, Yasuki; Takeshita, Hiroyuki T. Thermodynamic Evaluation for Formation of MgCu₂ from MgH₂ and Cu: 221–226. 2013. doi:10.1002/9781118792148.ch28.

[6] Arcot, Binny; Cabral, C.; Harper, J. M. E.; Murarka, S. P. Intermetallic Reactions Between Copper and Magnesium as an Adhesion / Barrier Layer. MRS Proceedings. 2011, 225. ISSN 0272-9172. doi:10.1557/PROC-225-231.

[7] Birol, Yucel. Response to Thermal Exposure of Ball-Milled Cu-Mg/B₂O₃ Powder Blends. Metallurgical and Materials Transactions B. 2013, 44 (4): 969–973. ISSN 1073-5615. doi:10.1007/s11663-013-9860-6.

[8] Volkova, L. S.; Kalinnikov, G. V.; Ivanov, A. V.; Shilkin, S. P. Synthesis of Mg₂Cu and MgCu₂ nanoparticles in a KCl-NaCl-MgCl₂ melt. Inorganic Materials. 2012, 48 (11): 1078–1081. ISSN 0020-1685. doi:10.1134/S0020168512110179.

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