Abstract
A series of compounds with compositions Fe5Si1-xGexB2 were synthesised and their structural and magnetic properties were investigated. The Mo5SiB2-type structure with tetragonal I4/mcm space group is maintained for all compounds with x<0.15, which is estimated as the compositional limit of the system. The unit cell parameters expand with Ge content before reaching a plateau of a = 5.5581(1) and c = 10.3545(1) Å at x=0.15. The saturation magnetisation (MS) decreased slightly with increasing Ge content whilst the magnetocrystalline anisotropy energy (MAE) remains almost unaffected. The Curie temperature for all compounds studied is at 790 K whilst the spin-reorientation temperature shows suppression from 172 K to 101 K where x=0.15. Ab Initio calculations reveal an increase in MAE for compositions up to x= 0.25 and a decreased magnitude of MAE of −0.14 MJ/m3 for the hypothetical compound Fe5GeB2 relative to the parent compound Fe5SiB2.
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