3. Computational studiesAn ordered supercell was derived from the structure of Pd1.63Mn0.37Si with the composition Pd9Mn3Si6, and with an orthohexagonal unit cell in the space group Pmm2 Magnetic compounds related to the Fe2P structure 4 Table 1. Crystal structures of the Pd-Mn-Si and Pd-Mn-Ge compounds. Space groupP ̄62m (No. 189) obtained from single-crystal X-ray diffraction.(No. 25). The calculated composition can be written Pd1.5Mn0.5Si and is quite proximal to the experimental composition. The electronic structure calculations used linear muffin tin orbitals (LMTO) within the local spin density approximation, as implemented in the stuttgart tb-lmto-asa program.[24, 25] The calculations were performed on 216 k points within the irreducible wedge of the Brillouin zone. The electron localization function (ELF)[26,27] has been used to understand the extent to which electrons are localized, to locate bonding and non-bonding electron pairs in the real space of the crystal structure.
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