Abstract
The zero-field splitting (ZFS) parameters D and F-a of ${\mathrm{Fe}}^{2+}$ ions in ${\mathrm{GeFe}}_{2}$${\mathrm{O}}_{4}$ are considered by diagonalizing the crystal-field and spin-orbit interaction Hamiltonian matrix. Results show that the spin-triplet contributions to ZFS are important, and the stronger the trigonal crystal field and the covalency effect assumed, the larger are these contributions.
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