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MgCu2是由构成的二元金属间化合物,属立方晶系,其空间群为Fd3m,晶胞参数a = 7.04 Å。[3]MgCu2也是一类化合物的结构类型,具有这一结构的有LaNi2、CeFe2、CeOs2、EuIr2、EuPt2、TmRh2等。[4]

MgCu2
别名 Cu2Mg
识别
CAS号 12054-17-0  ✓
PubChem 71355210
ChemSpider 57534863
SMILES
性质
化学式 Cu2Mg
摩尔质量 151.4 g·mol−1
密度 5.76 g·cm−3[1]
熔点 520 °C[2]
若非注明,所有数据均出自一般条件(25 ℃,100 kPa)下。

制备编辑

MgCu2可由Mg2Cu的氢化反应,或氢化镁在高温和压强下反应得到:[5]

2 Mg2Cu + 3 H2 → 3 MgH2 + MgCu2
MgH2 + 2 Cu → MgCu2 + H2

MgCu2也可以由化学计量比的单质在过量铜的存在下于380 °C反应制得。[6]

性质编辑

MgCu2可以和或其氧化物反应,生成镁的硼化物。[7]

Cu2Mg + 2 B → 2 Cu + MgB2
Cu2Mg + 6 B → 2 Cu + MgB6
14 Cu2Mg + 4 B2O3 → 28 Cu + MgB2 + MgB6 + 12 MgO

它也能和氢化镁反应,生成正交晶系的Mg2Cu并放出氢气。[8]

参考文献编辑

  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. 

参见编辑