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CaO10 crystallizes in the tetragonal P4/mcc space group. The structure is one-dimensional and consists of two hydrogen peroxide molecules and one CaO8 ribbon oriented in the (0, 0, 1) direction. In the CaO8 ribbon, Ca is bonded in a 8-coordinate geometry to eight equivalent O atoms. All Ca–O bond lengths are 2.48 Å. O is bonded in a bent 120 degrees geometry to one Ca and one O atom. The O–O bond length is 1.28 Å.
CaO10 crystallizes in the tetragonal P4/mcc space group. The structure is two-dimensional and consists of two molecular oxygen molecules and two CaO8 sheets oriented in the (0, 0, 1) direction. In each CaO8 sheet, Ca is bonded in a body-centered cubic geometry to eight equivalent O atoms. All Ca–O bond lengths are 2.47 Å. O is bonded in a distorted bent 120 degrees geometry to one Ca and one O atom. The O–O bond length is 1.28 Å.