Materials Data on FeCo9 by Materials Project
FeCo9 crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Fe is bonded in a distorted q6 geometry to ten Co atoms. There are eight shorter (2.39 Å) and two longer (2.43 Å) Fe–Co bond lengths. There are two inequivalent Co sites. In the first Co site, Co is bonded in a distorted q6 geometry to two equivalent Fe and eight equivalent Co atoms. All Co–Co bond lengths are 2.39 Å. In the second Co site, Co is bonded in a 6-coordinate geometry to one Fe and five Co atoms. There are two shorter (2.27 Å) and two longer (2.43 Å) Co–Co bond lengths.
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