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EuO3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Eu is bonded to twelve equivalent O atoms to form a mixture of face and corner-sharing EuO12 cuboctahedra. There are six shorter (2.51 Å) and six longer (2.59 Å) Eu–O bond lengths. O is bonded in a see-saw-like geometry to four equivalent Eu atoms.
EuO3 crystallizes in the hexagonal P6_3/m space group. The structure is three-dimensional. Eu is bonded in a 9-coordinate geometry to nine equivalent O atoms. There are three shorter (2.28 Å) and six longer (2.56 Å) Eu–O bond lengths. O is bonded in a 5-coordinate geometry to three equivalent Eu and two equivalent O atoms. Both O–O bond lengths are 1.88 Å.