- Gazi University Journal of Science
- Vol: 28 Issue: 2
- Spin-polarized ground state properties of Cr2AlX (X=C, N and B) ceramics
Spin-polarized ground state properties of Cr2AlX (X=C, N and B) ceramics
Authors : Sezgin Aydin
Pages : 185-193
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Publication Date : 2015-06-22
Article Type : Other
Abstract :The ground state structural, electronic and mechanical properties of Cr 2 AlX (X=C, N and B) ceramics have been investigated by first-principles density functional pseudopotential plane-wave calculations with and without spin-polarization effects. Especially, the effects of substitutional boron atoms on the structure and properties of Cr 2 AlC have been discussed in detail for the first time. All of the compounds, including newly presented Cr 2 AlB are energetically and mechanically stable. From spin-polarized first-principles calculations, it is interestingly concluded that the ground states of Cr 2 AlX (X=C, N and B) compounds should have magnetic character, and this assertion is supported that the theoretical results obtained from spin-polarized calculations are in excellent agreement with the experiment. Furthermore, the bonding, partial and total magnetic characteristics are explored in detail, by means of partial and total spin density of states, Mulliken atomic charges and bond overlap populations, and 2D electron density maps. Additionally, the elastic and mechanical properties are studied. And, theoretical hardnesses of Cr 2 AlX (X=C, N and B) compounds are calculated, and it observed that the metallicity of the compounds plays an important role on the hardness.Keywords : First-principles, spin-polarization, magnetic properties, mechanical properties, hardness