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Point defects and Zn-doping in defective Laves phase C15 MgCu2: A first-principles study
- Source :
- Computational Materials Science. 122:159-166
- Publication Year :
- 2016
- Publisher :
- Elsevier BV, 2016.
-
Abstract
- Employing first-principles calculations, the point defect in C15 Laves phase MgCu2 is studied. The formation enthalpies of point defects and defective C15 MgCu2 compound show that the dominating defect structure is MgCu and CuMg antisite defect on Mg-rich and Cu-rich side of off-stoichiometry, respectively. The concentration of various point defects as a function of composition of MgCu2 is analyzed from grand canonical statistics. The calculated local geometrical variation around defect demonstrates an apparent size effect, and the electronic densities of states and charge density difference distributions indicate the gradually weaker bonding from MgCu to VCu and from CuMg to VMg systems. Furthermore, doping of Zn atom in defective MgCu2 has been investigated. It is found that Zn has a stronger preference for occupying the Cu sublattice than for Mg sublattice because of the relative lower formation enthalpy. The electronic structure further reveals that the stability of Zn-doped system is associated with the stronger covalent bonds between Cu–Cu and Zn–Cu atoms.
- Subjects :
- Materials science
General Computer Science
Dopant
Condensed matter physics
Intermetallic
General Physics and Astronomy
Charge density
02 engineering and technology
General Chemistry
Electronic structure
Laves phase
021001 nanoscience & nanotechnology
01 natural sciences
Crystallographic defect
Computational Mathematics
Crystallography
Mechanics of Materials
Vacancy defect
0103 physical sciences
Atom
General Materials Science
010306 general physics
0210 nano-technology
Subjects
Details
- ISSN :
- 09270256
- Volume :
- 122
- Database :
- OpenAIRE
- Journal :
- Computational Materials Science
- Accession number :
- edsair.doi...........d6308560dd568f58d39f8a76885408cc